def _get_version_xblock(self):
course_key = self.usage_key.course_key
block_key = BlockKey.from_usage_key(self.usage_key)
store = modulestore()
for s in store.modulestores:
if isinstance(s, DraftVersioningModuleStore):
try:
entry = s.get_structure(course_key, self.version_guid)
course = CourseEnvelope(
course_key.replace(version_guid=self.version_guid),
entry)
course_entry = course
runtime = s._get_cache(course_entry.structure['_id'])
if runtime is None:
runtime = s.create_runtime(course_entry, lazy=True)
item = runtime.load_item(block_key, course_entry)
self.xblock = item
except Exception:
raise GetItemError
def xblock_from_json(self,
class_,
course_key,
block_key,
block_data,
course_entry_override=None,
**kwargs):
"""
Load and return block info.
"""
if course_entry_override is None:
course_entry_override = self.course_entry
else:
# most recent retrieval is most likely the right one for next caller (see comment above fn)
self.course_entry = CourseEnvelope(
course_entry_override.course_key, self.course_entry.structure)
definition_id = block_data.definition
# If no usage id is provided, generate an in-memory id
if block_key is None:
block_key = BlockKey(block_data.block_type, LocalId())
convert_fields = lambda field: self.modulestore.convert_references_to_keys(
course_key,
class_,
field,
self.course_entry.structure['blocks'],
)
if definition_id is not None and not block_data.definition_loaded:
definition_loader = DefinitionLazyLoader(
self.modulestore,
course_key,
block_key.type,
definition_id,
convert_fields,
)
else:
definition_loader = None
# If no definition id is provide, generate an in-memory id
if definition_id is None:
definition_id = LocalId()
# Construct the Block Usage Locator:
block_locator = course_key.make_usage_key(
block_type=block_key.type,
block_id=block_key.id,
)
converted_fields = convert_fields(block_data.fields)
converted_defaults = convert_fields(block_data.defaults)
if block_key in self._parent_map:
parent_key = self._parent_map[block_key]
parent = course_key.make_usage_key(parent_key.type, parent_key.id)
else:
parent = None
try:
kvs = SplitMongoKVS(definition_loader,
converted_fields,
converted_defaults,
parent=parent,
field_decorator=kwargs.get('field_decorator'))
if InheritanceMixin in self.modulestore.xblock_mixins:
field_data = inheriting_field_data(kvs)
else:
field_data = KvsFieldData(kvs)
module = self.construct_xblock_from_class(
class_,
ScopeIds(None, block_key.type, definition_id, block_locator),
field_data,
for_parent=kwargs.get('for_parent'))
except Exception: # pylint: disable=broad-except
log.warning("Failed to load descriptor", exc_info=True)
return ErrorDescriptor.from_json(
block_data,
self,
course_entry_override.course_key.make_usage_key(
block_type='error', block_id=block_key.id),
error_msg=exc_info_to_str(sys.exc_info()))
edit_info = block_data.edit_info
module._edited_by = edit_info.edited_by # pylint: disable=protected-access
module._edited_on = edit_info.edited_on # pylint: disable=protected-access
module.previous_version = edit_info.previous_version
module.update_version = edit_info.update_version
module.source_version = edit_info.source_version
module.definition_locator = DefinitionLocator(block_key.type,
definition_id)
# decache any pending field settings
module.save()
# If this is an in-memory block, store it in this system
if isinstance(block_locator.block_id, LocalId):
self.local_modules[block_locator] = module
return module
def xblock_from_json(self,
class_,
course_key,
block_key,
json_data,
course_entry_override=None,
**kwargs):
if course_entry_override is None:
course_entry_override = self.course_entry
else:
# most recent retrieval is most likely the right one for next caller (see comment above fn)
self.course_entry = CourseEnvelope(
course_entry_override.course_key, self.course_entry.structure)
definition_id = json_data.get('definition')
# If no usage id is provided, generate an in-memory id
if block_key is None:
block_key = BlockKey(json_data['block_type'], LocalId())
if definition_id is not None and not json_data.get(
'definition_loaded', False):
definition_loader = DefinitionLazyLoader(
self.modulestore, course_key, block_key.type, definition_id,
lambda fields: self.modulestore.convert_references_to_keys(
course_key,
self.load_block_type(block_key.type),
fields,
self.course_entry.structure['blocks'],
))
else:
definition_loader = None
# If no definition id is provide, generate an in-memory id
if definition_id is None:
definition_id = LocalId()
block_locator = BlockUsageLocator(
course_key,
block_type=block_key.type,
block_id=block_key.id,
)
converted_fields = self.modulestore.convert_references_to_keys(
block_locator.course_key,
class_,
json_data.get('fields', {}),
self.course_entry.structure['blocks'],
)
if block_key in self._parent_map:
parent_key = self._parent_map[block_key]
parent = course_key.make_usage_key(parent_key.type, parent_key.id)
else:
parent = None
kvs = SplitMongoKVS(definition_loader,
converted_fields,
parent=parent,
field_decorator=kwargs.get('field_decorator'))
if InheritanceMixin in self.modulestore.xblock_mixins:
field_data = inheriting_field_data(kvs)
else:
field_data = KvsFieldData(kvs)
try:
module = self.construct_xblock_from_class(
class_,
ScopeIds(None, block_key.type, definition_id, block_locator),
field_data,
)
except Exception:
log.warning("Failed to load descriptor", exc_info=True)
return ErrorDescriptor.from_json(
json_data,
self,
course_entry_override.course_key.make_usage_key(
block_type='error', block_id=block_key.id),
error_msg=exc_info_to_str(sys.exc_info()))
edit_info = json_data.get('edit_info', {})
module._edited_by = edit_info.get('edited_by')
module._edited_on = edit_info.get('edited_on')
module.previous_version = edit_info.get('previous_version')
module.update_version = edit_info.get('update_version')
module.source_version = edit_info.get('source_version', None)
module.definition_locator = DefinitionLocator(block_key.type,
definition_id)
# decache any pending field settings
module.save()
# If this is an in-memory block, store it in this system
if isinstance(block_locator.block_id, LocalId):
self.local_modules[block_locator] = module
return module