def _get_model(model_identifier):
"""
Helper to look up a model from an "app_label.module_name" string.
"""
try:
Model = models.get_model(*model_identifier.split("."))
except TypeError:
Model = None
if Model is None:
raise base.DeserializationError(u"Invalid model identifier: '%s'" %
model_identifier)
return Model
def kml(request,
label,
model,
field_name=None,
compress=False,
using=DEFAULT_DB_ALIAS):
"""
This view generates KML for the given app label, model, and field name.
The model's default manager must be GeoManager, and the field name
must be that of a geographic field.
"""
placemarks = []
klass = get_model(label, model)
if not klass:
raise Http404(
'You must supply a valid app label and module name. Got "%s.%s"' %
(label, model))
if field_name:
try:
info = klass._meta.get_field_by_name(field_name)
if not isinstance(info[0], GeometryField):
raise Exception
except:
raise Http404('Invalid geometry field.')
connection = connections[using]
if connection.ops.postgis:
# PostGIS will take care of transformation.
placemarks = klass._default_manager.using(using).kml(
field_name=field_name)
else:
# There's no KML method on Oracle or MySQL, so we use the `kml`
# attribute of the lazy geometry instead.
placemarks = []
if connection.ops.oracle:
qs = klass._default_manager.using(using).transform(
4326, field_name=field_name)
else:
qs = klass._default_manager.using(using).all()
for mod in qs:
mod.kml = getattr(mod, field_name).kml
placemarks.append(mod)
# Getting the render function and rendering to the correct.
if compress:
render = render_to_kmz
else:
render = render_to_kml
return render('gis/kml/placemarks.kml', {'places': placemarks})
def model_page(self, request, app_label, model_name, rest_of_url=None):
"""
Handles the model-specific functionality of the databrowse site, delegating
to the appropriate ModelDatabrowse class.
"""
model = models.get_model(app_label, model_name)
if model is None:
raise http.Http404("App %r, model %r, not found." %
(app_label, model_name))
try:
databrowse_class = self.registry[model]
except KeyError:
raise http.Http404(
"This model exists but has not been registered with databrowse."
)
return databrowse_class(model, self).root(request, rest_of_url)
def post_comment(request, next=None, using=None):
"""
Post a comment.
HTTP POST is required. If ``POST['submit'] == "preview"`` or if there are
errors a preview template, ``comments/preview.html``, will be rendered.
"""
# Fill out some initial data fields from an authenticated user, if present
data = request.POST.copy()
if request.user.is_authenticated():
if not data.get('name', ''):
data["name"] = request.user.get_full_name(
) or request.user.username
if not data.get('email', ''):
data["email"] = request.user.email
# Check to see if the POST data overrides the view's next argument.
next = data.get("next", next)
# Look up the object we're trying to comment about
ctype = data.get("content_type")
object_pk = data.get("object_pk")
if ctype is None or object_pk is None:
return CommentPostBadRequest(
"Missing content_type or object_pk field.")
try:
model = models.get_model(*ctype.split(".", 1))
target = model._default_manager.using(using).get(pk=object_pk)
except TypeError:
return CommentPostBadRequest("Invalid content_type value: %r" %
escape(ctype))
except AttributeError:
return CommentPostBadRequest(
"The given content-type %r does not resolve to a valid model." % \
escape(ctype))
except ObjectDoesNotExist:
return CommentPostBadRequest(
"No object matching content-type %r and object PK %r exists." % \
(escape(ctype), escape(object_pk)))
except (ValueError, ValidationError), e:
return CommentPostBadRequest(
"Attempting go get content-type %r and object PK %r exists raised %s" % \
(escape(ctype), escape(object_pk), e.__class__.__name__))
def _get_model_from_node(self, node, attr):
"""
Helper to look up a model from a <object model=...> or a <field
rel=... to=...> node.
"""
model_identifier = node.getAttribute(attr)
if not model_identifier:
raise base.DeserializationError(
"<%s> node is missing the required '%s' attribute" \
% (node.nodeName, attr))
try:
Model = models.get_model(*model_identifier.split("."))
except TypeError:
Model = None
if Model is None:
raise base.DeserializationError(
"<%s> node has invalid model identifier: '%s'" % \
(node.nodeName, model_identifier))
return Model
def model_class(self):
"Returns the Python model class for this type of content."
from my_django.db import models
return models.get_model(self.app_label, self.model,
only_installed=False)
def handle(self, *app_labels, **options):
from my_django.db.models import get_app, get_apps, get_model
format = options.get('format')
indent = options.get('indent')
using = options.get('database')
excludes = options.get('exclude')
show_traceback = options.get('traceback')
use_natural_keys = options.get('use_natural_keys')
use_base_manager = options.get('use_base_manager')
excluded_apps = set()
excluded_models = set()
for exclude in excludes:
if '.' in exclude:
app_label, model_name = exclude.split('.', 1)
model_obj = get_model(app_label, model_name)
if not model_obj:
raise CommandError('Unknown model in excludes: %s' %
exclude)
excluded_models.add(model_obj)
else:
try:
app_obj = get_app(exclude)
excluded_apps.add(app_obj)
except ImproperlyConfigured:
raise CommandError('Unknown app in excludes: %s' % exclude)
if len(app_labels) == 0:
app_list = SortedDict(
(app, None) for app in get_apps() if app not in excluded_apps)
else:
app_list = SortedDict()
for label in app_labels:
try:
app_label, model_label = label.split('.')
try:
app = get_app(app_label)
except ImproperlyConfigured:
raise CommandError("Unknown application: %s" %
app_label)
if app in excluded_apps:
continue
model = get_model(app_label, model_label)
if model is None:
raise CommandError("Unknown model: %s.%s" %
(app_label, model_label))
if app in app_list.keys():
if app_list[app] and model not in app_list[app]:
app_list[app].append(model)
else:
app_list[app] = [model]
except ValueError:
# This is just an app - no model qualifier
app_label = label
try:
app = get_app(app_label)
except ImproperlyConfigured:
raise CommandError("Unknown application: %s" %
app_label)
if app in excluded_apps:
continue
app_list[app] = None
# Check that the serialization format exists; this is a shortcut to
# avoid collating all the objects and _then_ failing.
if format not in serializers.get_public_serializer_formats():
raise CommandError("Unknown serialization format: %s" % format)
try:
serializers.get_serializer(format)
except KeyError:
raise CommandError("Unknown serialization format: %s" % format)
# Now collate the objects to be serialized.
objects = []
for model in sort_dependencies(app_list.items()):
if model in excluded_models:
continue
if not model._meta.proxy and router.allow_syncdb(using, model):
if use_base_manager:
objects.extend(model._base_manager.using(using).all())
else:
objects.extend(model._default_manager.using(using).all())
try:
return serializers.serialize(format,
objects,
indent=indent,
use_natural_keys=use_natural_keys)
except Exception, e:
if show_traceback:
raise
raise CommandError("Unable to serialize database: %s" % e)
def sort_dependencies(app_list):
"""Sort a list of app,modellist pairs into a single list of models.
The single list of models is sorted so that any model with a natural key
is serialized before a normal model, and any model with a natural key
dependency has it's dependencies serialized first.
"""
from my_django.db.models import get_model, get_models
# Process the list of models, and get the list of dependencies
model_dependencies = []
models = set()
for app, model_list in app_list:
if model_list is None:
model_list = get_models(app)
for model in model_list:
models.add(model)
# Add any explicitly defined dependencies
if hasattr(model, 'natural_key'):
deps = getattr(model.natural_key, 'dependencies', [])
if deps:
deps = [get_model(*d.split('.')) for d in deps]
else:
deps = []
# Now add a dependency for any FK or M2M relation with
# a model that defines a natural key
for field in model._meta.fields:
if hasattr(field.rel, 'to'):
rel_model = field.rel.to
if hasattr(rel_model, 'natural_key'):
deps.append(rel_model)
for field in model._meta.many_to_many:
rel_model = field.rel.to
if hasattr(rel_model, 'natural_key'):
deps.append(rel_model)
model_dependencies.append((model, deps))
model_dependencies.reverse()
# Now sort the models to ensure that dependencies are met. This
# is done by repeatedly iterating over the input list of models.
# If all the dependencies of a given model are in the final list,
# that model is promoted to the end of the final list. This process
# continues until the input list is empty, or we do a full iteration
# over the input models without promoting a model to the final list.
# If we do a full iteration without a promotion, that means there are
# circular dependencies in the list.
model_list = []
while model_dependencies:
skipped = []
changed = False
while model_dependencies:
model, deps = model_dependencies.pop()
# If all of the models in the dependency list are either already
# on the final model list, or not on the original serialization list,
# then we've found another model with all it's dependencies satisfied.
found = True
for candidate in ((d not in models or d in model_list)
for d in deps):
if not candidate:
found = False
if found:
model_list.append(model)
changed = True
else:
skipped.append((model, deps))
if not changed:
raise CommandError(
"Can't resolve dependencies for %s in serialized app list." %
', '.join('%s.%s' %
(model._meta.app_label, model._meta.object_name)
for model, deps in sorted(
skipped, key=lambda obj: obj[0].__name__)))
model_dependencies = skipped
return model_list