def rename_neuron(request, project_id=None, neuron_id=None): """Rename a neuron if it is not locked by a user on which the current user has no permission. """ # Make sure the user can edit the neuron can_edit_class_instance_or_fail(request.user, neuron_id, 'neuron') new_name = request.POST.get('name', None) if not new_name: raise ValueError("No name specified") # Do not allow '|' in name because it is used as string separator in NeuroHDF export if '|' in new_name: raise ValueError('New name should not contain pipe character') # Update neuron name neuron = ClassInstance.objects.get(id=neuron_id) old_name = neuron.name neuron.name=new_name neuron.save() # Insert log entry and return successfully insert_into_log(project_id, request.user.id, "rename_neuron", None, "Renamed neuron with ID %s from %s to %s" % (neuron.id , old_name, new_name)) return HttpResponse(json.dumps({ 'success': True, 'renamed_neuron': neuron.id }))
def rename_neuron(request: HttpRequest, project_id=None, neuron_id=None) -> JsonResponse: """Rename a neuron. If a neuron is not locked by a user on which the current user has no permission, the name of neuron can be changed through this endpoint. Neuron names are currently not allowed to contain pipe characters ("|"). --- parameters: - name: neuron_id description: ID of neuron to rename required: true type: integer paramType: path - name: name description: New name of the neuron required: true type: string paramType: form type: success: description: If renaming was successful type: boolean required: true renamed_neuron: description: ID of the renamed neuron type: integer required: true old_name: description: Old name of the renamed neuron type: string required: true """ # Make sure the user can edit the neuron can_edit_class_instance_or_fail(request.user, neuron_id, 'neuron') new_name = request.POST.get('name', None) if not new_name: raise ValueError("No name specified") # Do not allow '|' in name because it is used as string separator in NeuroHDF export if '|' in new_name: raise ValueError('New name should not contain pipe character') # Update neuron name neuron = ClassInstance.objects.get(id=neuron_id) old_name = neuron.name neuron.name = new_name neuron.save() # Insert log entry and return successfully insert_into_log( project_id, request.user.id, "rename_neuron", None, "Renamed neuron with ID %s from %s to %s" % (neuron.id, old_name, new_name)) return JsonResponse({ 'success': True, 'renamed_neuron': neuron.id, 'old_name': old_name })
def rename_neuron(request, project_id=None, neuron_id=None): """Rename a neuron if it is not locked by a user on which the current user has no permission. """ # Make sure the user can edit the neuron can_edit_class_instance_or_fail(request.user, neuron_id, 'neuron') new_name = request.POST.get('name', None) if not new_name: raise ValueError("No name specified") # Do not allow '|' in name because it is used as string separator in NeuroHDF export if '|' in new_name: raise ValueError('New name should not contain pipe character') # Update neuron name neuron = ClassInstance.objects.get(id=neuron_id) old_name = neuron.name neuron.name = new_name neuron.save() # Insert log entry and return successfully insert_into_log( project_id, request.user.id, "rename_neuron", None, "Renamed neuron with ID %s from %s to %s" % (neuron.id, old_name, new_name)) return HttpResponse( json.dumps({ 'success': True, 'renamed_neuron': neuron.id }))
def rename_neuron(request, project_id=None, neuron_id=None): """Rename a neuron. If a neuron is not locked by a user on which the current user has no permission, the name of neuron can be changed through this endpoint. Neuron names are currently not allowed to contain pipe characters ("|"). --- parameters: - name: neuron_id description: ID of neuron to rename required: true type: integer paramType: path - name: name description: New name of the neuron required: true type: string paramType: form type: success: description: If renaming was successful type: boolean required: true renamed_neuron: description: ID of the renamed neuron type: integer required: true old_name: description: Old name of the renamed neuron type: string required: true """ # Make sure the user can edit the neuron can_edit_class_instance_or_fail(request.user, neuron_id, "neuron") new_name = request.POST.get("name", None) if not new_name: raise ValueError("No name specified") # Do not allow '|' in name because it is used as string separator in NeuroHDF export if "|" in new_name: raise ValueError("New name should not contain pipe character") # Update neuron name neuron = ClassInstance.objects.get(id=neuron_id) old_name = neuron.name neuron.name = new_name neuron.save() # Insert log entry and return successfully insert_into_log( project_id, request.user.id, "rename_neuron", None, "Renamed neuron with ID %s from %s to %s" % (neuron.id, old_name, new_name), ) return HttpResponse(json.dumps({"success": True, "renamed_neuron": neuron.id, "old_name": old_name}))
def rename_node(): can_edit_class_instance_or_fail(request.user, params['id']) # Do not allow '|' in name because it is used as string separator in NeuroHDF export if '|' in params['title']: raise Exception('Name should not contain pipe character!') instance_operation.res_on_err = 'Failed to update class instance.' nodes_to_rename = ClassInstance.objects.filter(id=params['id']) node_ids = [node.id for node in nodes_to_rename] if len(node_ids) > 0: old_name = ",".join([n.name for n in nodes_to_rename]) nodes_to_rename.update(name=params['title']) insert_into_log(project_id, request.user.id, "rename_%s" % params['classname'], None, "Renamed %s with ID %s from %s to %s" % (params['classname'], params['id'], old_name, params['title'])) return HttpResponse(json.dumps({'class_instance_ids': node_ids})) else: instance_operation.res_on_err = '' raise Exception('Could not find any node with ID %s' % params['id'])
def create_node(): # Can only create a node if the parent node is owned by the user # or the user is a superuser # Given that the parentid is 0 to signal root (but root has a non-zero id), # this implies that regular non-superusers cannot create nodes under root, # but only in their staging area. can_edit_class_instance_or_fail(request.user, params['parentid']) if params['classname'] not in class_map: raise Exception('Failed to select class.') instance_operation.res_on_err = 'Failed to insert instance of class.' node = ClassInstance( user=request.user, name=params['objname']) node.project_id = project_id node.class_column_id = class_map[params['classname']] node.save() insert_into_log(project_id, request.user.id, "create_%s" % params['classname'], None, "Created %s with ID %s" % (params['classname'], params['id'])) # We need to connect the node to its parent, or to root if no valid parent is given. node_parent_id = params['parentid'] if 0 == params['parentid']: # Find root element instance_operation.res_on_err = 'Failed to select root.' node_parent_id = ClassInstance.objects.filter( project=project_id, class_column=class_map['root'])[0].id if params['relationname'] not in relation_map: instance_operation.res_on_err = '' raise Exception('Failed to select relation %s' % params['relationname']) instance_operation.res_on_err = 'Failed to insert relation.' cici = ClassInstanceClassInstance() cici.user = request.user cici.project_id = project_id cici.relation_id = relation_map[params['relationname']] cici.class_instance_a_id = node.id cici.class_instance_b_id = node_parent_id cici.save() return HttpResponse(json.dumps({'class_instance_id': node.id}))
def move_node(): # Can only move the node if the user owns the node and the target node, # or the user is a superuser can_edit_class_instance_or_fail(request.user, params['src'], 'node') # node to move can_edit_class_instance_or_fail(request.user, params['ref'], 'node') # new parent node # if 0 == params['src'] or 0 == params['ref']: raise Exception('src (%s) or ref (%s) not set.' % (params['src'], params['ref'])) relation_type = 'part_of' if 'skeleton' == params['classname']: # Special case for model_of relationship relation_type = 'model_of' instance_operation.res_on_err = 'Failed to update %s relation.' % relation_type ClassInstanceClassInstance.objects.filter( project=project_id, relation=relation_map[relation_type], class_instance_a=params['src']).update(class_instance_b=params['ref']) insert_into_log(project_id, request.user.id, 'move_%s' % params['classname'], None, 'Moved %s with ID %s to %s with ID %s' % (params['classname'], params['id'], params['targetname'], params['ref'])) return HttpResponse(json.dumps({'message': 'Success.'}))
def remove_node(): # Can only remove the node if the user owns it or the user is a superuser can_edit_class_instance_or_fail(request.user, params['id']) # Check if node is a skeleton. If so, we have to remove its treenodes as well! if 0 == params['rel']: raise Exception('No relation given!') elif 'skeleton' == params['rel']: remove_skeletons([params['id']]) insert_into_log(project_id, request.user.id, 'remove_skeleton', None, 'Removed skeleton with ID %s and name %s' % (params['id'], params['title'])) return HttpResponse(json.dumps({'status': 1, 'message': 'Removed skeleton successfully.'})) elif 'neuron' == params['rel']: instance_operation.res_on_err = 'Failed to retrieve node skeleton relations.' skeleton_relations = ClassInstanceClassInstance.objects.filter( project=project_id, relation=relation_map['model_of'], class_instance_b=params['id']) remove_skeletons([s.class_instance_a_id for s in skeleton_relations]) instance_operation.res_on_err = 'Failed to delete node from instance table.' node_to_delete = ClassInstance.objects.filter(id=params['id']) if node_to_delete.count() > 0: node_to_delete.delete() insert_into_log(project_id, request.user.id, 'remove_neuron', None, 'Removed neuron with ID %s and name %s' % (params['id'], params['title'])) return HttpResponse(json.dumps({'status': 1, 'message': 'Removed neuron successfully.'})) else: instance_operation.res_on_err = '' raise Exception('Could not find any node with ID %s' % params['id']) else: instance_operation.res_on_err = 'Failed to delete node from instance table.' node_to_delete = ClassInstance.objects.filter(id=params['id']) if node_to_delete.count() > 0: node_to_delete.delete() return HttpResponse(json.dumps({'status': 1, 'message': 'Removed node successfully.'})) else: instance_operation.res_on_err = '' raise Exception('Could not find any node with ID %s' % params['id'])
def get_skeleton_permissions(request, project_id, skeleton_id): """ Tests editing permissions of a user on a skeleton and returns the result as JSON object.""" try: nn = _get_neuronname_from_skeletonid( project_id, skeleton_id ) can_edit = can_edit_class_instance_or_fail(request.user, nn['neuronid']) except: can_edit = False permissions = { 'can_edit': can_edit, } return HttpResponse(json.dumps(permissions))
def can_edit_skeleton_or_fail(user, project_id, skeleton_id, model_of_relation_id): """Test if a user has permission to edit a neuron modeled by a skeleton.""" cursor = connection.cursor() cursor.execute(""" SELECT ci2.id as neuron_id FROM class_instance ci, class_instance ci2, class_instance_class_instance cici WHERE ci.project_id = %s AND ci.id = %s AND ci.id = cici.class_instance_a AND ci2.id = cici.class_instance_b AND cici.relation_id = %s """, (project_id, skeleton_id, model_of_relation_id)) if cursor.rowcount == 0: raise ValueError('No neuron modeled by skeleton %s' % skeleton_id) neuron_id = cursor.fetchone()[0] return can_edit_class_instance_or_fail(user, neuron_id, 'neuron')
def can_edit_skeleton_or_fail(user, project_id, skeleton_id, model_of_relation_id): """Test if a user has permission to edit a neuron modeled by a skeleton.""" cursor = connection.cursor() cursor.execute( """ SELECT ci2.id as neuron_id FROM class_instance ci, class_instance ci2, class_instance_class_instance cici WHERE ci.project_id = %s AND ci.id = %s AND ci.id = cici.class_instance_a AND ci2.id = cici.class_instance_b AND cici.relation_id = %s """, (project_id, skeleton_id, model_of_relation_id)) if cursor.rowcount == 0: raise ValueError('No neuron modeled by skeleton %s' % skeleton_id) neuron_id = cursor.fetchone()[0] return can_edit_class_instance_or_fail(user, neuron_id, 'neuron')
def _join_skeleton(user, from_treenode_id, to_treenode_id, project_id, annotation_map): """ Take the IDs of two nodes, each belonging to a different skeleton, and make to_treenode be a child of from_treenode, and join the nodes of the skeleton of to_treenode into the skeleton of from_treenode, and delete the former skeleton of to_treenode. All annotations in annotation_set will be linked to the skeleton of to_treenode. It is expected that <annotation_map> is a dictionary, mapping an annotation to an annotator ID. Also, all reviews of the skeleton that changes ID are changed to refer to the new skeleton ID. """ if from_treenode_id is None or to_treenode_id is None: raise Exception('Missing arguments to _join_skeleton') response_on_error = '' try: from_treenode_id = int(from_treenode_id) to_treenode_id = int(to_treenode_id) try: from_treenode = Treenode.objects.get(pk=from_treenode_id) except Treenode.DoesNotExist: raise Exception("Could not find a skeleton for treenode #%s" % from_treenode_id) try: to_treenode = Treenode.objects.get(pk=to_treenode_id) except Treenode.DoesNotExist: raise Exception("Could not find a skeleton for treenode #%s" % to_treenode_id) from_skid = from_treenode.skeleton_id from_neuron = _get_neuronname_from_skeletonid( project_id, from_skid ) to_skid = to_treenode.skeleton_id to_neuron = _get_neuronname_from_skeletonid( project_id, to_skid ) # Make sure the user has permissions to edit both neurons can_edit_class_instance_or_fail( user, from_neuron['neuronid'], 'neuron') can_edit_class_instance_or_fail( user, to_neuron['neuronid'], 'neuron') # Check if annotations are valid if not check_annotations_on_join(project_id, user, from_neuron['neuronid'], to_neuron['neuronid'], frozenset(annotation_map.keys())): raise Exception("Annotation distribution is not valid for joining. " \ "Annotations for which you don't have permissions have to be kept!") if from_skid == to_skid: raise Exception('Cannot join treenodes of the same skeleton, this would introduce a loop.') # Reroot to_skid at to_treenode if necessary response_on_error = 'Could not reroot at treenode %s' % to_treenode_id _reroot_skeleton(to_treenode_id, project_id) # The target skeleton is removed and its treenode assumes # the skeleton id of the from-skeleton. response_on_error = 'Could not update Treenode table with new skeleton id for joined treenodes.' Treenode.objects.filter(skeleton=to_skid).update(skeleton=from_skid) response_on_error = 'Could not update TreenodeConnector table.' TreenodeConnector.objects.filter( skeleton=to_skid).update(skeleton=from_skid) # Update reviews from 'losing' neuron to now belong to the new neuron response_on_error = 'Couldn not update reviews with new skeleton IDs for joined treenodes.' Review.objects.filter(skeleton_id=to_skid).update(skeleton=from_skid) # Remove skeleton of to_id (deletes cicic part_of to neuron by cascade, # leaving the parent neuron dangling in the object tree). response_on_error = 'Could not delete skeleton with ID %s.' % to_skid ClassInstance.objects.filter(pk=to_skid).delete() # Remove the 'losing' neuron if it is empty _delete_if_empty(to_neuron['neuronid']) # Update the parent of to_treenode. response_on_error = 'Could not update parent of treenode with ID %s' % to_treenode_id Treenode.objects.filter(id=to_treenode_id).update(parent=from_treenode_id, editor=user) # Update linked annotations of neuron response_on_error = 'Could not update annotations of neuron ' \ 'with ID %s' % from_neuron['neuronid'] _update_neuron_annotations(project_id, user, from_neuron['neuronid'], annotation_map) from_location = (from_treenode.location_x, from_treenode.location_y, from_treenode.location_z) insert_into_log(project_id, user.id, 'join_skeleton', from_location, 'Joined skeleton with ID %s (neuron: ' \ '%s) into skeleton with ID %s (neuron: %s, annotations: %s)' % \ (to_skid, to_neuron['neuronname'], from_skid, from_neuron['neuronname'], ', '.join(annotation_map.keys()))) except Exception as e: raise Exception(response_on_error + ':' + str(e))
def _create_treenode(project_id, creator, editor, x, y, z, radius, confidence, neuron_id, parent_id, creation_time=None, neuron_name=None): relation_map = get_relation_to_id_map(project_id) class_map = get_class_to_id_map(project_id) def insert_new_treenode(parent_id=None, skeleton_id=None): """ If the parent_id is not None and the skeleton_id of the parent does not match with the skeleton.id, then the database will throw an error given that the skeleton_id, being defined as foreign key in the treenode table, will not meet the being-foreign requirement. """ new_treenode = Treenode() new_treenode.user = creator new_treenode.editor = editor new_treenode.project_id = project_id if creation_time: new_treenode.creation_time = creation_time new_treenode.location_x = float(x) new_treenode.location_y = float(y) new_treenode.location_z = float(z) new_treenode.radius = int(radius) new_treenode.skeleton_id = skeleton_id new_treenode.confidence = int(confidence) if parent_id: new_treenode.parent_id = parent_id new_treenode.save() return new_treenode def relate_neuron_to_skeleton(neuron, skeleton): return _create_relation(creator, project_id, relation_map['model_of'], skeleton, neuron) response_on_error = '' try: if -1 != int(parent_id): # A root node and parent node exist # Select the parent treenode for update to prevent race condition # updates to its skeleton ID while this node is being created. cursor = connection.cursor() cursor.execute( ''' SELECT t.skeleton_id, t.edition_time FROM treenode t WHERE t.id = %s FOR NO KEY UPDATE OF t ''', (parent_id, )) if cursor.rowcount != 1: raise ValueError('Parent treenode %s does not exist' % parent_id) parent_node = cursor.fetchone() parent_skeleton_id = parent_node[0] parent_edition_time = parent_node[1] # Raise an Exception if the user doesn't have permission to edit # the neuron the skeleton of the treenode is modeling. can_edit_skeleton_or_fail(editor, project_id, parent_skeleton_id, relation_map['model_of']) response_on_error = 'Could not insert new treenode!' new_treenode = insert_new_treenode(parent_id, parent_skeleton_id) return NewTreenode(new_treenode.id, new_treenode.edition_time, parent_skeleton_id, parent_edition_time) else: # No parent node: We must create a new root node, which needs a # skeleton and a neuron to belong to. response_on_error = 'Could not insert new treenode instance!' new_skeleton = ClassInstance() new_skeleton.user = creator new_skeleton.project_id = project_id new_skeleton.class_column_id = class_map['skeleton'] new_skeleton.name = 'skeleton' new_skeleton.save() new_skeleton.name = 'skeleton %d' % new_skeleton.id new_skeleton.save() if -1 != neuron_id: # Check that the neuron to use exists if 0 == ClassInstance.objects.filter(pk=neuron_id).count(): neuron_id = -1 if -1 != neuron_id: # Raise an Exception if the user doesn't have permission to # edit the existing neuron. can_edit_class_instance_or_fail(editor, neuron_id, 'neuron') # A neuron already exists, so we use it response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(neuron_id, new_skeleton.id) response_on_error = 'Could not insert new treenode!' new_treenode = insert_new_treenode(None, new_skeleton.id) return NewTreenode(new_treenode.id, new_treenode.edition_time, new_skeleton.id, None) else: # A neuron does not exist, therefore we put the new skeleton # into a new neuron. response_on_error = 'Failed to insert new instance of a neuron.' new_neuron = ClassInstance() new_neuron.user = creator new_neuron.project_id = project_id new_neuron.class_column_id = class_map['neuron'] if neuron_name: # Create a regular expression to find allowed patterns. The # first group is the whole {nX} part, while the second group # is X only. counting_pattern = re.compile(r"(\{n(\d+)\})") # Look for patterns, replace all {n} with {n1} to normalize. neuron_name = neuron_name.replace("{n}", "{n1}") if counting_pattern.search(neuron_name): # Find starting values for each substitution. counts = [ int(m.groups()[1]) for m in counting_pattern.finditer(neuron_name) ] # Find existing matching neurons in database. name_match = counting_pattern.sub( r"(\d+)", neuron_name) name_pattern = re.compile(name_match) matching_neurons = ClassInstance.objects.filter( project_id=project_id, class_column_id=class_map['neuron'], name__regex=name_match).order_by('name') # Increment substitution values based on existing neurons. for n in matching_neurons: for i, (count, g) in enumerate( zip(counts, name_pattern.search(n.name).groups())): if count == int(g): counts[i] = count + 1 # Substitute values. count_ind = 0 m = counting_pattern.search(neuron_name) while m: neuron_name = m.string[:m.start()] + str( counts[count_ind]) + m.string[m.end():] count_ind = count_ind + 1 m = counting_pattern.search(neuron_name) new_neuron.name = neuron_name else: new_neuron.name = 'neuron' new_neuron.save() new_neuron.name = 'neuron %d' % new_neuron.id new_neuron.save() response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(new_neuron.id, new_skeleton.id) response_on_error = 'Failed to insert instance of treenode.' new_treenode = insert_new_treenode(None, new_skeleton.id) response_on_error = 'Failed to write to logs.' new_location = (new_treenode.location_x, new_treenode.location_y, new_treenode.location_z) insert_into_log( project_id, creator.id, 'create_neuron', new_location, 'Create neuron %d and skeleton ' '%d' % (new_neuron.id, new_skeleton.id)) return NewTreenode(new_treenode.id, new_treenode.edition_time, new_skeleton.id, None) except Exception as e: import traceback raise Exception( "%s: %s %s" % (response_on_error, str(e), str(traceback.format_exc())))
def can_edit_treenode_or_fail(user, project_id, treenode_id): """ Tests if a user has permissions to edit the neuron which the skeleton of the treenode models.""" info = _treenode_info(project_id, treenode_id) return can_edit_class_instance_or_fail(user, info['neuron_id'], 'neuron')
def create_treenode(request, project_id=None): """ Add a new treenode to the database ---------------------------------- 1. Add new treenode for a given skeleton id. Parent should not be empty. return: new treenode id If the parent's skeleton has a single node and belongs to the 'Isolated synaptic terminals' group, then reassign ownership of the skeleton and the neuron to the user. The treenode remains property of the original user who created it. 2. Add new treenode (root) and create a new skeleton (maybe for a given neuron) return: new treenode id and skeleton id. If a neuron id is given, use that one to create the skeleton as a model of it. """ params = {} float_values = { 'x': 0, 'y': 0, 'z': 0, 'radius': 0} int_values = { 'confidence': 0, 'useneuron': -1, 'parent_id': -1} string_values = {} for p in float_values.keys(): params[p] = float(request.POST.get(p, float_values[p])) for p in int_values.keys(): params[p] = int(request.POST.get(p, int_values[p])) for p in string_values.keys(): params[p] = request.POST.get(p, string_values[p]) relation_map = get_relation_to_id_map(project_id) class_map = get_class_to_id_map(project_id) def insert_new_treenode(parent_id=None, skeleton=None): """ If the parent_id is not None and the skeleton_id of the parent does not match with the skeleton.id, then the database will throw an error given that the skeleton_id, being defined as foreign key in the treenode table, will not meet the being-foreign requirement. """ new_treenode = Treenode() new_treenode.user = request.user new_treenode.editor = request.user new_treenode.project_id = project_id new_treenode.location_x = float(params['x']) new_treenode.location_y = float(params['y']) new_treenode.location_z = float(params['z']) new_treenode.radius = int(params['radius']) new_treenode.skeleton = skeleton new_treenode.confidence = int(params['confidence']) if parent_id: new_treenode.parent_id = parent_id new_treenode.save() return new_treenode def relate_neuron_to_skeleton(neuron, skeleton): return _create_relation(request.user, project_id, relation_map['model_of'], skeleton, neuron) response_on_error = '' try: if -1 != int(params['parent_id']): # A root node and parent node exist # Raise an Exception if the user doesn't have permission to edit # the neuron the skeleton of the treenode is modeling. can_edit_treenode_or_fail(request.user, project_id, params['parent_id']) parent_treenode = Treenode.objects.get(pk=params['parent_id']) response_on_error = 'Could not insert new treenode!' skeleton = ClassInstance.objects.get(pk=parent_treenode.skeleton_id) new_treenode = insert_new_treenode(params['parent_id'], skeleton) return HttpResponse(json.dumps({ 'treenode_id': new_treenode.id, 'skeleton_id': skeleton.id })) else: # No parent node: We must create a new root node, which needs a # skeleton and a neuron to belong to. response_on_error = 'Could not insert new treenode instance!' new_skeleton = ClassInstance() new_skeleton.user = request.user new_skeleton.project_id = project_id new_skeleton.class_column_id = class_map['skeleton'] new_skeleton.name = 'skeleton' new_skeleton.save() new_skeleton.name = 'skeleton %d' % new_skeleton.id new_skeleton.save() if -1 == params['useneuron']: # Check that the neuron to use exists if 0 == ClassInstance.objects.filter(pk=params['useneuron']).count(): params['useneuron'] = -1 if -1 != params['useneuron']: # Raise an Exception if the user doesn't have permission to # edit the existing neuron. can_edit_class_instance_or_fail(request.user, params['useneuron'], 'neuron') # A neuron already exists, so we use it response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(params['useneuron'], new_skeleton.id) response_on_error = 'Could not insert new treenode!' new_treenode = insert_new_treenode(None, new_skeleton) return HttpResponse(json.dumps({ 'treenode_id': new_treenode.id, 'skeleton_id': new_skeleton.id, 'neuron_id': params['useneuron']})) else: # A neuron does not exist, therefore we put the new skeleton # into a new neuron. response_on_error = 'Failed to insert new instance of a neuron.' new_neuron = ClassInstance() new_neuron.user = request.user new_neuron.project_id = project_id new_neuron.class_column_id = class_map['neuron'] new_neuron.name = 'neuron' new_neuron.save() new_neuron.name = 'neuron %d' % new_neuron.id new_neuron.save() response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(new_neuron.id, new_skeleton.id) response_on_error = 'Failed to insert instance of treenode.' new_treenode = insert_new_treenode(None, new_skeleton) response_on_error = 'Failed to write to logs.' new_location = (new_treenode.location_x, new_treenode.location_y, new_treenode.location_z) insert_into_log(project_id, request.user.id, 'create_neuron', new_location, 'Create neuron %d and skeleton ' '%d' % (new_neuron.id, new_skeleton.id)) return HttpResponse(json.dumps({ 'treenode_id': new_treenode.id, 'skeleton_id': new_skeleton.id, })) except Exception as e: import traceback raise Exception("%s: %s %s" % (response_on_error, str(e), str(traceback.format_exc())))
def delete_neuron(request, project_id=None, neuron_id=None): """ Deletes a neuron if and only if two things are the case: 1. The user ownes all treenodes of the skeleton modeling the neuron in question and 2. The neuron is not annotated by other users. """ # Make sure the user can edit the neuron in general can_edit_class_instance_or_fail(request.user, neuron_id, 'neuron') # Create class and relation dictionaries classes = dict( Class.objects.filter(project_id=project_id).values_list( 'class_name', 'id')) relations = dict( Relation.objects.filter(project_id=project_id).values_list( 'relation_name', 'id')) # Make sure the user has permission to edit all treenodes of all skeletons skeleton_ids = ClassInstanceClassInstance.objects.filter( class_instance_b=neuron_id, relation_id=relations['model_of']).values_list('class_instance_a', flat=True) for skid in skeleton_ids: others_nodes = Treenode.objects.filter(skeleton_id=skid).exclude( user_id=request.user.id).values_list('id', flat=True) if others_nodes: try: can_edit_all_or_fail(request.user, others_nodes, 'treenode') except Exception: raise Exception("You don't have permission to remove all " \ "treenodes of skeleton %s modeling this neuron. The " \ "neuron won't be deleted." % skid) # Make sure the user has permission to edit all annotations of this neuron annotation_ids = set( ClassInstanceClassInstance.objects.filter( class_instance_a_id=neuron_id, relation_id=relations['annotated_with']).values_list('id', flat=True)) if annotation_ids: try: can_edit_all_or_fail(request.user, annotation_ids, 'class_instance_class_instance') except Exception: raise Exception("You don't have permission to remove all " \ "annotations linked to this neuron. The neuron won't " \ "be deleted.") # Try to get the root node to have a valid location for a log entry if skeleton_ids: try: root_node = Treenode.objects.get(skeleton_id=skeleton_ids[0], parent=None) root_location = (root_node.location_x, root_node.location_y, root_node.location_z) except (Treenode.DoesNotExist, Treenode.MultipleObjectsReturned): root_location = None else: root_location = None # Delete neuron (and implicitely all annotation links due to Django's # cascading deletion) neuron = get_object_or_404(ClassInstance, pk=neuron_id) neuron.delete() # Delete all annotations that are not used anymore used_annotation_ids = set( ClassInstanceClassInstance.objects.filter( class_instance_b_id__in=annotation_ids, relation_id=relations['annotated_with']).values_list('id', flat=True)) unused_annotation_ids = annotation_ids.difference(used_annotation_ids) ClassInstance.objects.filter(id__in=unused_annotation_ids).delete() # Delete the skeletons (and their treenodes through cascading delete) cursor = connection.cursor() for skid in skeleton_ids: # Because there are constraints used in the database that Django is not # aware of, it's emulation of cascading deletion doesn't work. # Therefore, raw SQL needs to be used to use true cascading deletion. cursor.execute( ''' BEGIN; DELETE FROM change_request WHERE treenode_id IN ( SELECT id FROM treenode WHERE skeleton_id=%s AND project_id=%s); DELETE FROM change_request WHERE connector_id IN ( SELECT id FROM treenode_connector WHERE skeleton_id=%s AND project_id=%s); DELETE FROM treenode_class_instance WHERE treenode_id IN ( SELECT id FROM treenode WHERE skeleton_id=%s AND project_id=%s); DELETE FROM treenode WHERE skeleton_id=%s AND project_id=%s; DELETE FROM treenode_connector WHERE skeleton_id=%s AND project_id=%s; DELETE FROM class_instance WHERE id=%s AND project_id=%s; DELETE FROM review WHERE skeleton_id=%s AND project_id=%s; COMMIT; ''', (skid, project_id) * 7) # Insert log entry and refer to position of the first skeleton's root node insert_into_log( project_id, request.user.id, 'remove_neuron', root_location, 'Deleted neuron %s and skeleton(s) %s.' % (neuron_id, ', '.join([str(s) for s in skeleton_ids]))) return HttpResponse(json.dumps({ 'skeleton_ids': list(skeleton_ids), 'success': "Deleted neuron #%s as well as its skeletons and " \ "annotations." % neuron_id}))
def create_treenode(request, project_id=None): """ Add a new treenode to the database ---------------------------------- 1. Add new treenode for a given skeleton id. Parent should not be empty. return: new treenode id If the parent's skeleton has a single node and belongs to the 'Isolated synaptic terminals' group, then reassign ownership of the skeleton and the neuron to the user. The treenode remains property of the original user who created it. 2. Add new treenode (root) and create a new skeleton (maybe for a given neuron) return: new treenode id and skeleton id. If a neuron id is given, use that one to create the skeleton as a model of it. """ params = {} float_values = {'x': 0, 'y': 0, 'z': 0, 'radius': 0} int_values = {'confidence': 0, 'useneuron': -1, 'parent_id': -1} string_values = {} for p in float_values.keys(): params[p] = float(request.POST.get(p, float_values[p])) for p in int_values.keys(): params[p] = int(request.POST.get(p, int_values[p])) for p in string_values.keys(): params[p] = request.POST.get(p, string_values[p]) relation_map = get_relation_to_id_map(project_id) class_map = get_class_to_id_map(project_id) def insert_new_treenode(parent_id=None, skeleton=None): """ If the parent_id is not None and the skeleton_id of the parent does not match with the skeleton.id, then the database will throw an error given that the skeleton_id, being defined as foreign key in the treenode table, will not meet the being-foreign requirement. """ new_treenode = Treenode() new_treenode.user = request.user new_treenode.editor = request.user new_treenode.project_id = project_id new_treenode.location_x = float(params['x']) new_treenode.location_y = float(params['y']) new_treenode.location_z = float(params['z']) new_treenode.radius = int(params['radius']) new_treenode.skeleton = skeleton new_treenode.confidence = int(params['confidence']) if parent_id: new_treenode.parent_id = parent_id new_treenode.save() return new_treenode def relate_neuron_to_skeleton(neuron, skeleton): return _create_relation(request.user, project_id, relation_map['model_of'], skeleton, neuron) response_on_error = '' try: if -1 != int(params['parent_id']): # A root node and parent node exist # Raise an Exception if the user doesn't have permission to edit # the neuron the skeleton of the treenode is modeling. can_edit_treenode_or_fail(request.user, project_id, params['parent_id']) parent_treenode = Treenode.objects.get(pk=params['parent_id']) response_on_error = 'Could not insert new treenode!' skeleton = ClassInstance.objects.get( pk=parent_treenode.skeleton_id) new_treenode = insert_new_treenode(params['parent_id'], skeleton) return HttpResponse( json.dumps({ 'treenode_id': new_treenode.id, 'skeleton_id': skeleton.id })) else: # No parent node: We must create a new root node, which needs a # skeleton and a neuron to belong to. response_on_error = 'Could not insert new treenode instance!' new_skeleton = ClassInstance() new_skeleton.user = request.user new_skeleton.project_id = project_id new_skeleton.class_column_id = class_map['skeleton'] new_skeleton.name = 'skeleton' new_skeleton.save() new_skeleton.name = 'skeleton %d' % new_skeleton.id new_skeleton.save() if -1 == params['useneuron']: # Check that the neuron to use exists if 0 == ClassInstance.objects.filter( pk=params['useneuron']).count(): params['useneuron'] = -1 if -1 != params['useneuron']: # Raise an Exception if the user doesn't have permission to # edit the existing neuron. can_edit_class_instance_or_fail(request.user, params['useneuron'], 'neuron') # A neuron already exists, so we use it response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(params['useneuron'], new_skeleton.id) response_on_error = 'Could not insert new treenode!' new_treenode = insert_new_treenode(None, new_skeleton) return HttpResponse( json.dumps({ 'treenode_id': new_treenode.id, 'skeleton_id': new_skeleton.id, 'neuron_id': params['useneuron'] })) else: # A neuron does not exist, therefore we put the new skeleton # into a new neuron. response_on_error = 'Failed to insert new instance of a neuron.' new_neuron = ClassInstance() new_neuron.user = request.user new_neuron.project_id = project_id new_neuron.class_column_id = class_map['neuron'] new_neuron.name = 'neuron' new_neuron.save() new_neuron.name = 'neuron %d' % new_neuron.id new_neuron.save() response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(new_neuron.id, new_skeleton.id) response_on_error = 'Failed to insert instance of treenode.' new_treenode = insert_new_treenode(None, new_skeleton) response_on_error = 'Failed to write to logs.' new_location = (new_treenode.location_x, new_treenode.location_y, new_treenode.location_z) insert_into_log( project_id, request.user.id, 'create_neuron', new_location, 'Create neuron %d and skeleton ' '%d' % (new_neuron.id, new_skeleton.id)) return HttpResponse( json.dumps({ 'treenode_id': new_treenode.id, 'skeleton_id': new_skeleton.id, })) except Exception as e: import traceback raise Exception( "%s: %s %s" % (response_on_error, str(e), str(traceback.format_exc())))
def _create_treenode(project_id, creator, editor, x, y, z, radius, confidence, neuron_id, parent_id, creation_time=None, neuron_name=None): relation_map = get_relation_to_id_map(project_id) class_map = get_class_to_id_map(project_id) def insert_new_treenode(parent_id=None, skeleton_id=None): """ If the parent_id is not None and the skeleton_id of the parent does not match with the skeleton.id, then the database will throw an error given that the skeleton_id, being defined as foreign key in the treenode table, will not meet the being-foreign requirement. """ new_treenode = Treenode() new_treenode.user = creator new_treenode.editor = editor new_treenode.project_id = project_id if creation_time: new_treenode.creation_time = creation_time new_treenode.location_x = float(x) new_treenode.location_y = float(y) new_treenode.location_z = float(z) new_radius = int(radius if (radius and not math.isnan(radius)) else 0) new_treenode.radius = new_radius new_treenode.skeleton_id = skeleton_id new_confidence = int(confidence if not math.isnan(confidence) and (confidence or confidence is 0) else 5) new_treenode.confidence = new_confidence if parent_id: new_treenode.parent_id = parent_id new_treenode.save() return new_treenode def relate_neuron_to_skeleton(neuron, skeleton): return _create_relation(creator, project_id, relation_map['model_of'], skeleton, neuron) response_on_error = '' try: if -1 != int(parent_id): # A root node and parent node exist # Select the parent treenode for update to prevent race condition # updates to its skeleton ID while this node is being created. cursor = connection.cursor() cursor.execute(''' SELECT t.skeleton_id, t.edition_time FROM treenode t WHERE t.id = %s FOR NO KEY UPDATE OF t ''', (parent_id,)) if cursor.rowcount != 1: raise ValueError('Parent treenode %s does not exist' % parent_id) parent_node = cursor.fetchone() parent_skeleton_id = parent_node[0] parent_edition_time = parent_node[1] # Raise an Exception if the user doesn't have permission to edit # the neuron the skeleton of the treenode is modeling. can_edit_skeleton_or_fail(editor, project_id, parent_skeleton_id, relation_map['model_of']) response_on_error = 'Could not insert new treenode!' new_treenode = insert_new_treenode(parent_id, parent_skeleton_id) return NewTreenode(new_treenode.id, new_treenode.edition_time, parent_skeleton_id, parent_edition_time) else: # No parent node: We must create a new root node, which needs a # skeleton and a neuron to belong to. response_on_error = 'Could not insert new treenode instance!' new_skeleton = ClassInstance() new_skeleton.user = creator new_skeleton.project_id = project_id new_skeleton.class_column_id = class_map['skeleton'] new_skeleton.name = 'skeleton' new_skeleton.save() new_skeleton.name = 'skeleton %d' % new_skeleton.id new_skeleton.save() if -1 != neuron_id: # Check that the neuron to use exists if 0 == ClassInstance.objects.filter(pk=neuron_id).count(): neuron_id = -1 if -1 != neuron_id: # Raise an Exception if the user doesn't have permission to # edit the existing neuron. can_edit_class_instance_or_fail(editor, neuron_id, 'neuron') # A neuron already exists, so we use it response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(neuron_id, new_skeleton.id) response_on_error = 'Could not insert new treenode!' new_treenode = insert_new_treenode(None, new_skeleton.id) return NewTreenode(new_treenode.id, new_treenode.edition_time, new_skeleton.id, None) else: # A neuron does not exist, therefore we put the new skeleton # into a new neuron. response_on_error = 'Failed to insert new instance of a neuron.' new_neuron = ClassInstance() new_neuron.user = creator new_neuron.project_id = project_id new_neuron.class_column_id = class_map['neuron'] if neuron_name: # Create a regular expression to find allowed patterns. The # first group is the whole {nX} part, while the second group # is X only. counting_pattern = re.compile(r"(\{n(\d+)\})") # Look for patterns, replace all {n} with {n1} to normalize. neuron_name = neuron_name.replace("{n}", "{n1}") if counting_pattern.search(neuron_name): # Find starting values for each substitution. counts = [int(m.groups()[1]) for m in counting_pattern.finditer(neuron_name)] # Find existing matching neurons in database. name_match = counting_pattern.sub(r"(\d+)", neuron_name) name_pattern = re.compile(name_match) matching_neurons = ClassInstance.objects.filter( project_id=project_id, class_column_id=class_map['neuron'], name__regex=name_match).order_by('name') # Increment substitution values based on existing neurons. for n in matching_neurons: for i, (count, g) in enumerate(zip(counts, name_pattern.search(n.name).groups())): if count == int(g): counts[i] = count + 1 # Substitute values. count_ind = 0 m = counting_pattern.search(neuron_name) while m: neuron_name = m.string[:m.start()] + str(counts[count_ind]) + m.string[m.end():] count_ind = count_ind + 1 m = counting_pattern.search(neuron_name) new_neuron.name = neuron_name else: new_neuron.name = 'neuron' new_neuron.save() new_neuron.name = 'neuron %d' % new_neuron.id new_neuron.save() response_on_error = 'Could not relate the neuron model to ' \ 'the new skeleton!' relate_neuron_to_skeleton(new_neuron.id, new_skeleton.id) response_on_error = 'Failed to insert instance of treenode.' new_treenode = insert_new_treenode(None, new_skeleton.id) response_on_error = 'Failed to write to logs.' new_location = (new_treenode.location_x, new_treenode.location_y, new_treenode.location_z) insert_into_log(project_id, creator.id, 'create_neuron', new_location, 'Create neuron %d and skeleton ' '%d' % (new_neuron.id, new_skeleton.id)) return NewTreenode(new_treenode.id, new_treenode.edition_time, new_skeleton.id, None) except Exception as e: import traceback raise Exception("%s: %s %s" % (response_on_error, str(e), str(traceback.format_exc())))
def delete_neuron(request, project_id=None, neuron_id=None): """ Deletes a neuron if and only if two things are the case: 1. The user ownes all treenodes of the skeleton modeling the neuron in question and 2. The neuron is not annotated by other users. """ # Make sure the user can edit the neuron in general can_edit_class_instance_or_fail(request.user, neuron_id, 'neuron') # Create class and relation dictionaries classes = dict(Class.objects.filter( project_id=project_id).values_list('class_name', 'id')) relations = dict(Relation.objects.filter( project_id=project_id).values_list('relation_name', 'id')) # Make sure the user has permission to edit all treenodes of all skeletons skeleton_ids = ClassInstanceClassInstance.objects.filter( class_instance_b=neuron_id, relation_id=relations['model_of']).values_list( 'class_instance_a', flat=True) for skid in skeleton_ids: others_nodes = Treenode.objects.filter(skeleton_id=skid).exclude( user_id=request.user.id).values_list('id', flat=True) if others_nodes: try: can_edit_all_or_fail(request.user, others_nodes, 'treenode') except Exception: raise Exception("You don't have permission to remove all " \ "treenodes of skeleton %s modeling this neuron. The " \ "neuron won't be deleted." % skid) # Make sure the user has permission to edit all annotations of this neuron annotation_ids = set(ClassInstanceClassInstance.objects.filter( class_instance_a_id=neuron_id, relation_id=relations['annotated_with']).values_list( 'id', flat=True)) if annotation_ids: try: can_edit_all_or_fail(request.user, annotation_ids, 'class_instance_class_instance') except Exception: raise Exception("You don't have permission to remove all " \ "annotations linked to this neuron. The neuron won't " \ "be deleted.") # Try to get the root node to have a valid location for a log entry if skeleton_ids: try: root_node = Treenode.objects.get( skeleton_id=skeleton_ids[0], parent=None) root_location = (root_node.location_x, root_node.location_y, root_node.location_z) except (Treenode.DoesNotExist, Treenode.MultipleObjectsReturned): root_location = None else: root_location = None # Delete neuron (and implicitely all annotation links due to Django's # cascading deletion) neuron = get_object_or_404(ClassInstance, pk=neuron_id) neuron.delete() # Delete all annotations that are not used anymore used_annotation_ids = set(ClassInstanceClassInstance.objects.filter( class_instance_b_id__in=annotation_ids, relation_id=relations['annotated_with']).values_list( 'id', flat=True)) unused_annotation_ids = annotation_ids.difference(used_annotation_ids) ClassInstance.objects.filter(id__in=unused_annotation_ids).delete() # Delete the skeletons (and their treenodes through cascading delete) cursor = connection.cursor() for skid in skeleton_ids: # Because there are constraints used in the database that Django is not # aware of, it's emulation of cascading deletion doesn't work. # Therefore, raw SQL needs to be used to use true cascading deletion. cursor.execute(''' BEGIN; DELETE FROM change_request WHERE treenode_id IN ( SELECT id FROM treenode WHERE skeleton_id=%s AND project_id=%s); DELETE FROM change_request WHERE connector_id IN ( SELECT id FROM treenode_connector WHERE skeleton_id=%s AND project_id=%s); DELETE FROM treenode_class_instance WHERE treenode_id IN ( SELECT id FROM treenode WHERE skeleton_id=%s AND project_id=%s); DELETE FROM treenode WHERE skeleton_id=%s AND project_id=%s; DELETE FROM treenode_connector WHERE skeleton_id=%s AND project_id=%s; DELETE FROM class_instance WHERE id=%s AND project_id=%s; DELETE FROM review WHERE skeleton_id=%s AND project_id=%s; COMMIT; ''', (skid, project_id) * 7) # Insert log entry and refer to position of the first skeleton's root node insert_into_log(project_id, request.user.id, 'remove_neuron', root_location, 'Deleted neuron %s and skeleton(s) %s.' % (neuron_id, ', '.join([str(s) for s in skeleton_ids]))) return HttpResponse(json.dumps({ 'skeleton_ids': list(skeleton_ids), 'success': "Deleted neuron #%s as well as its skeletons and " \ "annotations." % neuron_id}))
def split_skeleton(request, project_id=None): """ The split is only possible if the neuron is not locked or if it is locked by the current user or if the current user belongs to the group of the user who locked it. Of course, the split is also possible if the current user is a super-user. Also, all reviews of the treenodes in the new neuron are updated to refer to the new skeleton. """ treenode_id = int(request.POST['treenode_id']) treenode = Treenode.objects.get(pk=treenode_id) skeleton_id = treenode.skeleton_id upstream_annotation_map = json.loads(request.POST.get('upstream_annotation_map')) downstream_annotation_map = json.loads(request.POST.get('downstream_annotation_map')) cursor = connection.cursor() # Check if the treenode is root! if not treenode.parent: return HttpResponse(json.dumps({'error': 'Can\'t split at the root node: it doesn\'t have a parent.'})) # Check if annotations are valid if not check_annotations_on_split(project_id, skeleton_id, frozenset(upstream_annotation_map.keys()), frozenset(downstream_annotation_map.keys())): raise Exception("Annotation distribution is not valid for splitting. " \ "One part has to keep the whole set of annotations!") skeleton = ClassInstance.objects.select_related('user').get(pk=skeleton_id) project_id=int(project_id) # retrieve neuron of this skeleton neuron = ClassInstance.objects.get( cici_via_b__relation__relation_name='model_of', cici_via_b__class_instance_a_id=skeleton_id) # Make sure the user has permissions to edit can_edit_class_instance_or_fail(request.user, neuron.id, 'neuron') # retrieve the id, parent_id of all nodes in the skeleton # with minimal ceremony cursor.execute(''' SELECT id, parent_id FROM treenode WHERE skeleton_id=%s ''' % skeleton_id) # no need to sanitize # build the networkx graph from it graph = nx.DiGraph() for row in cursor.fetchall(): graph.add_node( row[0] ) if row[1]: # edge from parent_id to id graph.add_edge( row[1], row[0] ) # find downstream nodes starting from target treenode_id # and generate the list of IDs to change, starting at treenode_id (inclusive) change_list = nx.bfs_tree(graph, treenode_id).nodes() if not change_list: # When splitting an end node, the bfs_tree doesn't return any nodes, # which is surprising, because when the splitted tree has 2 or more nodes # the node at which the split is made is included in the list. change_list.append(treenode_id) # create a new skeleton new_skeleton = ClassInstance() new_skeleton.name = 'Skeleton' new_skeleton.project_id = project_id new_skeleton.user = skeleton.user # The same user that owned the skeleton to split new_skeleton.class_column = Class.objects.get(class_name='skeleton', project_id=project_id) new_skeleton.save() new_skeleton.name = 'Skeleton {0}'.format( new_skeleton.id ) # This could be done with a trigger in the database new_skeleton.save() # Create new neuron new_neuron = ClassInstance() new_neuron.name = 'Neuron' new_neuron.project_id = project_id new_neuron.user = skeleton.user new_neuron.class_column = Class.objects.get(class_name='neuron', project_id=project_id) new_neuron.save() new_neuron.name = 'Neuron %s' % str(new_neuron.id) new_neuron.save() # Assign the skeleton to new neuron cici = ClassInstanceClassInstance() cici.class_instance_a = new_skeleton cici.class_instance_b = new_neuron cici.relation = Relation.objects.get(relation_name='model_of', project_id=project_id) cici.user = skeleton.user # The same user that owned the skeleton to split cici.project_id = project_id cici.save() # update skeleton_id of list in treenode table # This creates a lazy QuerySet that, upon calling update, returns a new QuerySet # that is then executed. It does NOT create an update SQL query for every treenode. tns = Treenode.objects.filter(id__in=change_list).update(skeleton=new_skeleton) # update the skeleton_id value of the treenode_connector table tc = TreenodeConnector.objects.filter( relation__relation_name__endswith = 'synaptic_to', treenode__in=change_list, ).update(skeleton=new_skeleton) # setting new root treenode's parent to null Treenode.objects.filter(id=treenode_id).update(parent=None, editor=request.user) # Update annotations of existing neuron to have only over set _update_neuron_annotations(project_id, request.user, neuron.id, upstream_annotation_map) # Update all reviews of the treenodes that are moved to a new neuron to # refer to the new skeleton. Review.objects.filter(treenode_id__in=change_list).update(skeleton=new_skeleton) # Update annotations of under skeleton _annotate_entities(project_id, [new_neuron.id], downstream_annotation_map) # Log the location of the node at which the split was done location = (treenode.location_x, treenode.location_y, treenode.location_z) insert_into_log(project_id, request.user.id, "split_skeleton", location, "Split skeleton with ID {0} (neuron: {1})".format( skeleton_id, neuron.name ) ) return HttpResponse(json.dumps({}), content_type='text/json')