def toPython( self, bsonValue ):
self._getClassInfo( )
if bsonValue is None:
return None
documentClass = None
if isinstance(bsonValue, dbref.DBRef):
# old style (mongoengine)
dbRef = bsonValue
documentClass = self.documentClass
documentName = self.documentName
initialData = {
'_id': bsonValue.id,
}
else:
# new style (dict with extra info)
dbRef = bsonValue['_ref']
if '_cls' in bsonValue:
# mongoengine GenericReferenceField compatibility
documentName = bsonValue['_cls']
elif '_types' in bsonValue:
documentName = bsonValue['_types'][0]
else:
return dbRef
documentClass = DocumentRegistry.getDocument( documentName )
initialData = {
'_id': dbRef.id,
}
initialData.update( bsonValue.get( '_cache', {} ) )
return documentClass( )._fromMongo( initialData )
def _getClassInfo( self ): if hasattr(self, 'documentName'): return documentClass = self.inputDocumentClass if isinstance(documentClass, basestring): if documentClass == 'self': self.documentName = self.ownerDocument.__name__ self.documentClass = self.ownerDocument else: self.documentName = documentClass self.documentClass = DocumentRegistry.getDocument( self.documentName ) else: self.documentClass = documentClass self.documentName = documentClass.__name__
def _getNewInstance( self, data ): documentName = data.get( '_types', [self.document.__name__] )[0] documentClass = DocumentRegistry.getDocument( documentName ) assert issubclass( documentClass, self.document ) return documentClass( )._fromMongo( data )
def __new__( cls, name, bases, attrs ):
if DocumentRegistry.hasDocument( name ):
return DocumentRegistry.getDocument( name )
# don't do anything if we're the class that defines the metaclass
#metaclass = attrs.get( '__metaclass__' )
superNew = super(DocumentMetaclass, cls).__new__
#if metaclass and issubclass(metaclass, DocumentMetaclass):
# return superNew( cls, name, bases, attrs )
fields = {}
collection = name.lower()
needsPrimaryKey = False
primaryKey = None
# find all inherited fields and record them
for base in bases:
if hasattr(base, '_fields'):
fields.update( base._fields )
if hasattr(base, '_collection'):
collection = base._collection
if hasattr(base, '__needs_primary_key__'):
needsPrimaryKey = True
if not '__internal__' in attrs:
attrs['_collection'] = collection
# find all fields and add them to our field list
for attrName, attrValue in attrs.items( ):
if hasattr(attrValue, '__class__') and \
issubclass(attrValue.__class__, BaseField):
field = attrValue
field.name = attrName
if not hasattr(field, 'dbField') or field.dbField is None:
field.dbField = attrName
fields[attrName] = field
del attrs[attrName]
def indexConverter( fieldName ):
if fieldName in fields:
return fields[fieldName].optimalIndex( )
return fieldName
for field,value in fields.iteritems( ):
if value.primaryKey:
assert primaryKey is None, "Can only have one primary key per document"
primaryKey = field
if value.unique:
keyOpts = { 'unique': True }
if value.dropDups:
keyOpts['dropDups'] = True
connection.stagedIndexes.append( (collection, indexConverter( field ), keyOpts) )
# add a primary key if none exists and one is required
if needsPrimaryKey and primaryKey is None:
fields['id'] = ObjectIdField( primaryKey=True, dbField='_id' )
primaryKey = 'id'
attrs['_primaryKeyField'] = primaryKey
# make sure we have all indexes that are specified
if 'meta' in attrs:
meta = attrs['meta']
if 'indexes' in meta:
indexes = meta['indexes']
for index in indexes:
if not isinstance(index, (list,tuple)):
index = [index]
pyMongoIndexKeys = sortListToPyMongo( index, indexConverter )
connection.stagedIndexes.append( (collection, pyMongoIndexKeys, {}) )
# add a query set manager if none exists already
if 'objects' not in attrs:
attrs['objects'] = QuerySetManager( )
# construct the new class
attrs['_is_lazy'] = False
attrs['_fields'] = fields
attrs['_data'] = None
attrs['_values'] = None
newClass = superNew( cls, name, bases, attrs )
# record the document in the fields
for field in newClass._fields.values( ):
#field.ownerDocument = newClass
field.setOwnerDocument( newClass )
# add DoesNotExist and MultipleObjectsReturned exceptions
module = attrs.get('__module__')
newClass._addException( 'DoesNotExist', bases,
defaultBase=DoesNotExist,
module=module )
newClass._addException( 'MultipleObjectsReturned', bases,
defaultBase=MultipleObjectsReturned,
module=module )
# register the document for name-based reference
DocumentRegistry.registerDocument( name, newClass )
if connection.database is not None:
connection.ensureIndexes()
return newClass