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Cleaned up the metaclasses for documents

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Refactored and clarified intent and
tidied up
This commit is contained in:
Ross Lawley
2012-08-17 11:15:36 +01:00
parent 9e67941bad
commit 19da228855
9 changed files with 407 additions and 297 deletions
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580
mongoengine/base.py
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@@ -17,6 +17,12 @@ import pymongo
from bson import ObjectId
from bson.dbref import DBRef
ALLOW_INHERITANCE = True
_document_registry = {}
_class_registry = {}
class NotRegistered(Exception):
pass
@@ -111,16 +117,13 @@ class ValidationError(AssertionError):
return ' '.join(["%s: %s" % (k, v) for k, v in error_dict.iteritems()])
_document_registry = {}
_module_registry = {}
def get_document(name):
doc = _document_registry.get(name, None)
if not doc:
# Possible old style names
end = ".%s" % name
possible_match = [k for k in _document_registry.keys() if k.endswith(end)]
possible_match = [k for k in _document_registry.keys()
if k.endswith(end)]
if len(possible_match) == 1:
doc = _document_registry.get(possible_match.pop(), None)
if not doc:
@@ -153,7 +156,8 @@ class BaseField(object):
def __init__(self, db_field=None, name=None, required=False, default=None,
unique=False, unique_with=None, primary_key=False,
validation=None, choices=None, verbose_name=None, help_text=None):
validation=None, choices=None, verbose_name=None,
help_text=None):
self.db_field = (db_field or name) if not primary_key else '_id'
if name:
msg = "Fields' 'name' attribute deprecated in favour of 'db_field'"
@@ -237,11 +241,15 @@ class BaseField(object):
value_to_check = value.__class__ if is_cls else value
err_msg = 'an instance' if is_cls else 'one'
if isinstance(self.choices[0], (list, tuple)):
option_keys = [option_key for option_key, option_value in self.choices]
option_keys = [k for k, v in self.choices]
if value_to_check not in option_keys:
self.error('Value must be %s of %s' % (err_msg, unicode(option_keys)))
msg = ('Value must be %s of %s' %
(err_msg, unicode(option_keys)))
self.error(msg)
elif value_to_check not in self.choices:
self.error('Value must be %s of %s' % (err_msg, unicode(self.choices)))
msg = ('Value must be %s of %s' %
(err_msg, unicode(self.choices)))
self.error()
# check validation argument
if self.validation is not None:
@@ -286,7 +294,8 @@ class ComplexBaseField(BaseField):
value = super(ComplexBaseField, self).__get__(instance, owner)
# Convert lists / values so we can watch for any changes on them
if isinstance(value, (list, tuple)) and not isinstance(value, BaseList):
if (isinstance(value, (list, tuple)) and
not isinstance(value, BaseList)):
value = BaseList(value, instance, self.name)
instance._data[self.name] = value
elif isinstance(value, dict) and not isinstance(value, BaseDict):
@@ -328,7 +337,8 @@ class ComplexBaseField(BaseField):
return value
if self.field:
value_dict = dict([(key, self.field.to_python(item)) for key, item in value.items()])
value_dict = dict([(key, self.field.to_python(item))
for key, item in value.items()])
else:
value_dict = {}
for k, v in value.items():
@@ -345,7 +355,8 @@ class ComplexBaseField(BaseField):
value_dict[k] = self.to_python(v)
if is_list: # Convert back to a list
return [v for k, v in sorted(value_dict.items(), key=operator.itemgetter(0))]
return [v for k, v in sorted(value_dict.items(),
key=operator.itemgetter(0))]
return value_dict
def to_mongo(self, value):
@@ -368,7 +379,8 @@ class ComplexBaseField(BaseField):
return value
if self.field:
value_dict = dict([(key, self.field.to_mongo(item)) for key, item in value.items()])
value_dict = dict([(key, self.field.to_mongo(item))
for key, item in value.items()])
else:
value_dict = {}
for k, v in value.items():
@@ -381,8 +393,11 @@ class ComplexBaseField(BaseField):
# If its a document that is not inheritable it won't have
# _types / _cls data so make it a generic reference allows
# us to dereference
meta = getattr(v, 'meta', getattr(v, '_meta', {}))
if meta and not meta.get('allow_inheritance', True) and not self.field:
meta = getattr(v, '_meta', {})
allow_inheritance = (
meta.get('allow_inheritance', ALLOW_INHERITANCE)
== False)
if allow_inheritance and not self.field:
from fields import GenericReferenceField
value_dict[k] = GenericReferenceField().to_mongo(v)
else:
@@ -394,7 +409,8 @@ class ComplexBaseField(BaseField):
value_dict[k] = self.to_mongo(v)
if is_list: # Convert back to a list
return [v for k, v in sorted(value_dict.items(), key=operator.itemgetter(0))]
return [v for k, v in sorted(value_dict.items(),
key=operator.itemgetter(0))]
return value_dict
def validate(self, value):
@@ -479,77 +495,25 @@ class DocumentMetaclass(type):
"""
def __new__(cls, name, bases, attrs):
def _get_mixin_fields(base):
attrs = {}
attrs.update(dict([(k, v) for k, v in base.__dict__.items()
if issubclass(v.__class__, BaseField)]))
# Handle simple mixin's with meta
if hasattr(base, 'meta') and not isinstance(base, DocumentMetaclass):
meta = attrs.get('meta', {})
meta.update(base.meta)
attrs['meta'] = meta
for p_base in base.__bases__:
#optimize :-)
if p_base in (object, BaseDocument):
continue
attrs.update(_get_mixin_fields(p_base))
return attrs
metaclass = attrs.get('my_metaclass')
bases = cls._get_bases(bases)
super_new = super(DocumentMetaclass, cls).__new__
# If a base class just call super
metaclass = attrs.get('my_metaclass')
if metaclass and issubclass(metaclass, DocumentMetaclass):
return super_new(cls, name, bases, attrs)
attrs['_is_document'] = attrs.get('_is_document', False)
# Handle document Fields
# Merge all fields from subclasses
doc_fields = {}
class_name = [name]
superclasses = {}
simple_class = True
for base in bases:
# Include all fields present in superclasses
for base in bases[::-1]:
if hasattr(base, '_fields'):
doc_fields.update(base._fields)
# Get superclasses from superclass
superclasses[base._class_name] = base
superclasses.update(base._superclasses)
else: # Add any mixin fields
attrs.update(_get_mixin_fields(base))
if hasattr(base, '_meta') and not base._meta.get('abstract'):
# Ensure that the Document class may be subclassed -
# inheritance may be disabled to remove dependency on
# additional fields _cls and _types
class_name.append(base._class_name)
if not base._meta.get('allow_inheritance_defined', True):
warnings.warn(
"%s uses inheritance, the default for allow_inheritance "
"is changing to off by default. Please add it to the "
"document meta." % name,
FutureWarning
)
if base._meta.get('allow_inheritance', True) == False:
raise ValueError('Document %s may not be subclassed' %
base.__name__)
else:
simple_class = False
doc_class_name = '.'.join(reversed(class_name))
meta = attrs.get('_meta', {})
meta.update(attrs.get('meta', {}))
if 'allow_inheritance' not in meta:
meta['allow_inheritance'] = True
# Only simple classes - direct subclasses of Document - may set
# allow_inheritance to False
if not simple_class and not meta['allow_inheritance'] and not meta['abstract']:
raise ValueError('Only direct subclasses of Document may set '
'"allow_inheritance" to False')
# Add the document's fields to the _fields attribute
# Discover any document fields
field_names = {}
for attr_name, attr_value in attrs.iteritems():
if not isinstance(attr_value, BaseField):
@@ -559,69 +523,93 @@ class DocumentMetaclass(type):
attr_value.db_field = attr_name
doc_fields[attr_name] = attr_value
field_names[attr_value.db_field] = field_names.get(attr_value.db_field, 0) + 1
# Count names to ensure no db_field redefinitions
field_names[attr_value.db_field] = field_names.get(
attr_value.db_field, 0) + 1
# Ensure no duplicate db_fields
duplicate_db_fields = [k for k, v in field_names.items() if v > 1]
if duplicate_db_fields:
raise InvalidDocumentError("Multiple db_fields defined for: %s " % ", ".join(duplicate_db_fields))
msg = ("Multiple db_fields defined for: %s " %
", ".join(duplicate_db_fields))
raise InvalidDocumentError(msg)
# Set _fields and db_field maps
attrs['_fields'] = doc_fields
attrs['_db_field_map'] = dict([(k, v.db_field) for k, v in doc_fields.items() if k != v.db_field])
attrs['_reverse_db_field_map'] = dict([(v, k) for k, v in attrs['_db_field_map'].items()])
attrs['_meta'] = meta
attrs['_class_name'] = doc_class_name
attrs['_db_field_map'] = dict(
((k, v.db_field) for k, v in doc_fields.items()
if k != v.db_field))
attrs['_reverse_db_field_map'] = dict(
(v, k) for k, v in attrs['_db_field_map'].iteritems())
#
# Set document hierarchy
#
superclasses = {}
class_name = [name]
for base in bases:
if (not getattr(base, '_is_base_cls', True) and
not getattr(base, '_meta', {}).get('abstract', True)):
# Collate heirarchy for _cls and _types
class_name.append(base.__name__)
# Get superclasses from superclass
superclasses[base._class_name] = base
superclasses.update(base._superclasses)
attrs['_class_name'] = '.'.join(reversed(class_name))
attrs['_superclasses'] = superclasses
if 'Document' not in _module_registry:
from mongoengine.document import Document, EmbeddedDocument
from mongoengine.fields import DictField
_module_registry['Document'] = Document
_module_registry['EmbeddedDocument'] = EmbeddedDocument
_module_registry['DictField'] = DictField
else:
Document = _module_registry.get('Document')
EmbeddedDocument = _module_registry.get('EmbeddedDocument')
DictField = _module_registry.get('DictField')
# Create the new_class
new_class = super_new(cls, name, bases, attrs)
# Handle delete rules
Document, EmbeddedDocument, DictField = cls._import_classes()
for field in new_class._fields.itervalues():
field.owner_document = new_class
delete_rule = getattr(field, 'reverse_delete_rule', DO_NOTHING)
f = field
f.owner_document = new_class
delete_rule = getattr(f, 'reverse_delete_rule', DO_NOTHING)
if isinstance(f, ComplexBaseField) and hasattr(f, 'field'):
delete_rule = getattr(f.field, 'reverse_delete_rule', DO_NOTHING)
delete_rule = getattr(f.field,
'reverse_delete_rule',
DO_NOTHING)
if isinstance(f, DictField) and delete_rule != DO_NOTHING:
raise InvalidDocumentError("Reverse delete rules are not supported for %s (field: %s)" % (field.__class__.__name__, field.name))
msg = ("Reverse delete rules are not supported "
"for %s (field: %s)" %
(field.__class__.__name__, field.name))
raise InvalidDocumentError(msg)
f = field.field
if delete_rule != DO_NOTHING:
if issubclass(new_class, EmbeddedDocument):
raise InvalidDocumentError("Reverse delete rules are not supported for EmbeddedDocuments (field: %s)" % field.name)
f.document_type.register_delete_rule(new_class, field.name, delete_rule)
msg = ("Reverse delete rules are not supported for "
"EmbeddedDocuments (field: %s)" % field.name)
raise InvalidDocumentError(msg)
f.document_type.register_delete_rule(new_class,
field.name, delete_rule)
if (field.name and
hasattr(Document, field.name) and
if (field.name and hasattr(Document, field.name) and
EmbeddedDocument not in new_class.mro()):
raise InvalidDocumentError("%s is a document method and not a valid field name" % field.name)
msg = ("%s is a document method and not a valid "
"field name" % field.name)
raise InvalidDocumentError(msg)
# Merge in exceptions with parent hierarchy
exceptions_to_merge = (DoesNotExist, MultipleObjectsReturned)
module = attrs.get('__module__')
for exc in exceptions_to_merge:
name = exc.__name__
parents = tuple(getattr(base, name) for base in bases
if hasattr(base, name)) or (exc,)
# Create new exception and set to new_class
exception = type(name, parents, {'__module__': module})
setattr(new_class, name, exception)
base_excs = tuple(base.DoesNotExist for base in bases
if hasattr(base, 'DoesNotExist')) or (DoesNotExist,)
exc = subclass_exception('DoesNotExist', base_excs, module)
new_class.add_to_class('DoesNotExist', exc)
# Add class to the _document_registry
_document_registry[new_class._class_name] = new_class
base_excs = tuple(base.MultipleObjectsReturned for base in bases
if hasattr(base, 'MultipleObjectsReturned'))
base_excs = base_excs or (MultipleObjectsReturned,)
exc = subclass_exception('MultipleObjectsReturned', base_excs, module)
new_class.add_to_class('MultipleObjectsReturned', exc)
global _document_registry
_document_registry[doc_class_name] = new_class
# in Python 2, User-defined methods objects have special read-only
# In Python 2, User-defined methods objects have special read-only
# attributes 'im_func' and 'im_self' which contain the function obj
# and class instance object respectively. With Python 3 these special
# attributes have been replaced by __func__ and __self__. The Blinker
@@ -633,15 +621,40 @@ class DocumentMetaclass(type):
if isinstance(val, classmethod):
f = val.__get__(new_class)
if hasattr(f, '__func__') and not hasattr(f, 'im_func'):
f.__dict__.update({'im_func':getattr(f, '__func__')})
f.__dict__.update({'im_func': getattr(f, '__func__')})
if hasattr(f, '__self__') and not hasattr(f, 'im_self'):
f.__dict__.update({'im_self':getattr(f, '__self__')})
f.__dict__.update({'im_self': getattr(f, '__self__')})
return new_class
def add_to_class(self, name, value):
setattr(self, name, value)
@classmethod
def _get_bases(cls, bases):
if isinstance(bases, BasesTuple):
return bases
seen = []
bases = cls.__get_bases(bases)
unique_bases = (b for b in bases if not (b in seen or seen.append(b)))
return BasesTuple(unique_bases)
@classmethod
def __get_bases(cls, bases):
for base in bases:
if base is object:
continue
yield base
for child_base in cls.__get_bases(base.__bases__):
yield child_base
@classmethod
def _import_classes(cls):
Document = _import_class('Document')
EmbeddedDocument = _import_class('EmbeddedDocument')
DictField = _import_class('DictField')
return (Document, EmbeddedDocument, DictField)
class TopLevelDocumentMetaclass(DocumentMetaclass):
"""Metaclass for top-level documents (i.e. documents that have their own
@@ -649,125 +662,157 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
"""
def __new__(cls, name, bases, attrs):
bases = cls._get_bases(bases)
super_new = super(TopLevelDocumentMetaclass, cls).__new__
# Classes defined in this package are abstract and should not have
# their own metadata with DB collection, etc.
# __metaclass__ is only set on the class with the __metaclass__
# attribute (i.e. it is not set on subclasses). This differentiates
# 'real' documents from the 'Document' class
#
# Also assume a class is abstract if it has abstract set to True in
# its meta dictionary. This allows custom Document superclasses.
if (attrs.get('my_metaclass') == TopLevelDocumentMetaclass or
('meta' in attrs and attrs['meta'].get('abstract', False))):
# Make sure no base class was non-abstract
non_abstract_bases = [b for b in bases
if hasattr(b, '_meta') and not b._meta.get('abstract', False)]
if non_abstract_bases:
raise ValueError("Abstract document cannot have non-abstract base")
# Set default _meta data if base class, otherwise get user defined meta
if (attrs.get('my_metaclass') == TopLevelDocumentMetaclass):
# defaults
attrs['_meta'] = {
'abstract': True,
'max_documents': None,
'max_size': None,
'ordering': [], # default ordering applied at runtime
'indexes': [], # indexes to be ensured at runtime
'id_field': None,
'index_background': False,
'index_drop_dups': False,
'index_opts': None,
'delete_rules': None,
'allow_inheritance': None,
}
attrs['_is_base_cls'] = True
attrs['_meta'].update(attrs.get('meta', {}))
else:
attrs['_meta'] = attrs.get('meta', {})
# Explictly set abstract to false unless set
attrs['_meta']['abstract'] = attrs['_meta'].get('abstract', False)
attrs['_is_base_cls'] = False
# Set flag marking as document class - as opposed to an object mixin
attrs['_is_document'] = True
# Ensure queryset_class is inherited
if 'objects' in attrs:
manager = attrs['objects']
if hasattr(manager, 'queryset_class'):
attrs['_meta']['queryset_class'] = manager.queryset_class
# Clean up top level meta
if 'meta' in attrs:
del(attrs['meta'])
# Find the parent document class
parent_doc_cls = [b for b in bases
if b.__class__ == TopLevelDocumentMetaclass]
parent_doc_cls = None if not parent_doc_cls else parent_doc_cls[0]
# Prevent classes setting collection different to their parents
# If parent wasn't an abstract class
if (parent_doc_cls and 'collection' in attrs.get('_meta', {})
and not parent_doc_cls._meta.get('abstract', True)):
msg = "Trying to set a collection on a subclass (%s)" % name
warnings.warn(msg, SyntaxWarning)
del(attrs['_meta']['collection'])
# Ensure abstract documents have abstract bases
if attrs.get('_is_base_cls') or attrs['_meta'].get('abstract'):
if (parent_doc_cls and
not parent_doc_cls._meta.get('abstract', False)):
msg = "Abstract document cannot have non-abstract base"
raise ValueError(msg)
return super_new(cls, name, bases, attrs)
collection = ''.join('_%s' % c if c.isupper() else c for c in name).strip('_').lower()
# Merge base class metas.
# Uses a special MetaDict that handles various merging rules
meta = MetaDict()
for base in bases[::-1]:
# Add any mixin metadata from plain objects
if hasattr(base, 'meta'):
meta.merge(base.meta)
elif hasattr(base, '_meta'):
# Warn if allow_inheritance isn't set and prevent
# inheritance of classes where inheritance is set to False
allow_inheritance = base._meta.get('allow_inheritance',
ALLOW_INHERITANCE)
if not base._is_base_cls and allow_inheritance is None:
warnings.warn(
"%s uses inheritance, the default for "
"allow_inheritance is changing to off by default. "
"Please add it to the document meta." % name,
FutureWarning
)
elif (allow_inheritance == False and
not base._meta.get('abstract')):
raise ValueError('Document %s may not be subclassed' %
base.__name__)
meta.merge(base._meta)
id_field = None
abstract_base_indexes = []
base_indexes = []
base_meta = {}
# Set collection in the meta if its callable
if (getattr(base, '_is_document', False) and
not base._meta.get('abstract')):
collection = meta.get('collection', None)
if callable(collection):
meta['collection'] = collection(base)
# Subclassed documents inherit collection from superclass
for base in bases:
if hasattr(base, '_meta'):
if 'collection' in attrs.get('meta', {}) and not base._meta.get('abstract', False):
import warnings
msg = "Trying to set a collection on a subclass (%s)" % name
warnings.warn(msg, SyntaxWarning)
del(attrs['meta']['collection'])
if base._get_collection_name():
collection = base._get_collection_name()
# Standard object mixin - merge in any Fields
if not hasattr(base, '_meta'):
attrs.update(dict([(k, v) for k, v in base.__dict__.items()
if issubclass(v.__class__, BaseField)]))
# Propagate inherited values
keys_to_propogate = (
'index_background', 'index_drop_dups', 'index_opts',
'allow_inheritance', 'queryset_class', 'db_alias',
'shard_key'
)
for key in keys_to_propogate:
if key in base._meta:
base_meta[key] = base._meta[key]
meta.merge(attrs.get('_meta', {})) # Top level meta
id_field = id_field or base._meta.get('id_field')
if base._meta.get('abstract', False):
abstract_base_indexes += base._meta.get('indexes', [])
else:
base_indexes += base._meta.get('indexes', [])
try:
base_meta['objects'] = base.__getattribute__(base, 'objects')
except TypeError:
pass
except AttributeError:
pass
# Only simple classes (direct subclasses of Document)
# may set allow_inheritance to False
simple_class = all([b._meta.get('abstract')
for b in bases if hasattr(b, '_meta')])
if (not simple_class and meta['allow_inheritance'] == False and
not meta['abstract']):
raise ValueError('Only direct subclasses of Document may set '
'"allow_inheritance" to False')
# defaults
meta = {
'abstract': False,
'collection': collection,
'max_documents': None,
'max_size': None,
'ordering': [], # default ordering applied at runtime
'indexes': [], # indexes to be ensured at runtime
'id_field': id_field,
'index_background': False,
'index_drop_dups': False,
'index_opts': {},
'queryset_class': QuerySet,
'delete_rules': {},
'allow_inheritance': True
}
allow_inheritance_defined = ('allow_inheritance' in base_meta or
'allow_inheritance'in attrs.get('meta', {}))
meta['allow_inheritance_defined'] = allow_inheritance_defined
meta.update(base_meta)
# Apply document-defined meta options
meta.update(attrs.get('meta', {}))
# Set default collection name
if 'collection' not in meta:
meta['collection'] = ''.join('_%s' % c if c.isupper() else c
for c in name).strip('_').lower()
attrs['_meta'] = meta
# Set up collection manager, needs the class to have fields so use
# DocumentMetaclass before instantiating CollectionManager object
# Call super and get the new class
new_class = super_new(cls, name, bases, attrs)
collection = attrs['_meta'].get('collection', None)
if callable(collection):
new_class._meta['collection'] = collection(new_class)
# Provide a default queryset unless one has been manually provided
manager = attrs.get('objects', meta.get('objects', QuerySetManager()))
if hasattr(manager, 'queryset_class'):
meta['queryset_class'] = manager.queryset_class
new_class.objects = manager
indicies = list(meta['indexes']) + abstract_base_indexes
user_indexes = [QuerySet._build_index_spec(new_class, spec)
for spec in indicies] + base_indexes
new_class._meta['indexes'] = user_indexes
meta = new_class._meta
# Set index specifications
meta['index_specs'] = [QuerySet._build_index_spec(new_class, spec)
for spec in meta['indexes']]
unique_indexes = cls._unique_with_indexes(new_class)
new_class._meta['unique_indexes'] = unique_indexes
# If collection is a callable - call it and set the value
collection = meta.get('collection')
if callable(collection):
new_class._meta['collection'] = collection(new_class)
# Provide a default queryset unless one has been set
manager = attrs.get('objects', QuerySetManager())
new_class.objects = manager
# Validate the fields and set primary key if needed
for field_name, field in new_class._fields.iteritems():
# Check for custom primary key
if field.primary_key:
current_pk = new_class._meta['id_field']
# Ensure only one primary key is set
current_pk = new_class._meta.get('id_field')
if current_pk and current_pk != field_name:
raise ValueError('Cannot override primary key field')
# Set primary key
if not current_pk:
new_class._meta['id_field'] = field_name
# Make 'Document.id' an alias to the real primary key field
new_class.id = field
if not new_class._meta['id_field']:
# Set primary key if not defined by the document
if not new_class._meta.get('id_field'):
new_class._meta['id_field'] = 'id'
new_class._fields['id'] = ObjectIdField(db_field='_id')
new_class.id = new_class._fields['id']
@@ -776,6 +821,9 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
@classmethod
def _unique_with_indexes(cls, new_class, namespace=""):
"""
Find and set unique indexes
"""
unique_indexes = []
for field_name, field in new_class._fields.items():
# Generate a list of indexes needed by uniqueness constraints
@@ -801,18 +849,34 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
unique_fields += unique_with
# Add the new index to the list
index = [("%s%s" % (namespace, f), pymongo.ASCENDING) for f in unique_fields]
index = [("%s%s" % (namespace, f), pymongo.ASCENDING)
for f in unique_fields]
unique_indexes.append(index)
# Grab any embedded document field unique indexes
if field.__class__.__name__ == "EmbeddedDocumentField" and field.document_type != new_class:
if (field.__class__.__name__ == "EmbeddedDocumentField" and
field.document_type != new_class):
field_namespace = "%s." % field_name
unique_indexes += cls._unique_with_indexes(field.document_type,
field_namespace)
field_namespace)
return unique_indexes
class MetaDict(dict):
"""Custom dictionary for meta classes.
Handles the merging of set indexes
"""
_merge_options = ('indexes',)
def merge(self, new_options):
for k, v in new_options.iteritems():
if k in self._merge_options:
self[k] = self.get(k, []) + v
else:
self[k] = v
class BaseDocument(object):
_dynamic = False
@@ -877,10 +941,11 @@ class BaseDocument(object):
self._data[name] = value
if hasattr(self, '_changed_fields'):
self._mark_as_changed(name)
if not self._created and name in self._meta.get('shard_key', tuple()):
from queryset import OperationError
raise OperationError("Shard Keys are immutable. Tried to update %s" % name)
if (self._is_document and not self._created and
name in self._meta.get('shard_key', tuple())):
OperationError = _import_class('OperationError')
msg = "Shard Keys are immutable. Tried to update %s" % name
raise OperationError(msg)
super(BaseDocument, self).__setattr__(name, value)
@@ -912,7 +977,8 @@ class BaseDocument(object):
value = data
# Convert lists / values so we can watch for any changes on them
if isinstance(value, (list, tuple)) and not isinstance(value, BaseList):
if (isinstance(value, (list, tuple)) and
not isinstance(value, BaseList)):
value = BaseList(value, self, name)
elif isinstance(value, dict) and not isinstance(value, BaseDict):
value = BaseDict(value, self, name)
@@ -953,7 +1019,7 @@ class BaseDocument(object):
data[field.db_field] = field.to_mongo(value)
# Only add _cls and _types if allow_inheritance is not False
if not (hasattr(self, '_meta') and
self._meta.get('allow_inheritance', True) == False):
self._meta.get('allow_inheritance', ALLOW_INHERITANCE) == False):
data['_cls'] = self._class_name
data['_types'] = self._superclasses.keys() + [self._class_name]
if '_id' in data and data['_id'] is None:
@@ -1012,9 +1078,11 @@ class BaseDocument(object):
changed_fields.append(field_name)
if errors_dict:
errors = "\n".join(["%s - %s" % (k, v) for k, v in errors_dict.items()])
raise InvalidDocumentError("""
Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, errors))
errors = "\n".join(["%s - %s" % (k, v)
for k, v in errors_dict.items()])
msg = ("Invalid data to create a `%s` instance.\n%s"
% (cls._class_name, errors))
raise InvalidDocumentError(msg)
if PY25:
data = dict([(str(k), v) for k, v in data.items()])
@@ -1029,7 +1097,8 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
if not key:
return
key = self._db_field_map.get(key, key)
if hasattr(self, '_changed_fields') and key not in self._changed_fields:
if (hasattr(self, '_changed_fields') and
key not in self._changed_fields):
self._changed_fields.append(key)
def _get_changed_fields(self, key='', inspected=None):
@@ -1059,9 +1128,14 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
continue
inspected.add(field.id)
if isinstance(field, (EmbeddedDocument, DynamicEmbeddedDocument)) and db_field_name not in _changed_fields: # Grab all embedded fields that have been changed
_changed_fields += ["%s%s" % (key, k) for k in field._get_changed_fields(key, inspected) if k]
elif isinstance(field, (list, tuple, dict)) and db_field_name not in _changed_fields: # Loop list / dict fields as they contain documents
if (isinstance(field, (EmbeddedDocument, DynamicEmbeddedDocument))
and db_field_name not in _changed_fields):
# Find all embedded fields that have been changed
changed = field._get_changed_fields(key, inspected)
_changed_fields += ["%s%s" % (key, k) for k in changed if k]
elif (isinstance(field, (list, tuple, dict)) and
db_field_name not in _changed_fields):
# Loop list / dict fields as they contain documents
# Determine the iterator to use
if not hasattr(field, 'items'):
iterator = enumerate(field)
@@ -1071,7 +1145,9 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
if not hasattr(value, '_get_changed_fields'):
continue
list_key = "%s%s." % (key, index)
_changed_fields += ["%s%s" % (list_key, k) for k in value._get_changed_fields(list_key, inspected) if k]
changed = value._get_changed_fields(list_key, inspected)
_changed_fields += ["%s%s" % (list_key, k)
for k in changed if k]
return _changed_fields
def _delta(self):
@@ -1113,7 +1189,8 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
# If we've set a value that ain't the default value dont unset it.
default = None
if self._dynamic and len(parts) and parts[0] in self._dynamic_fields:
if (self._dynamic and len(parts) and
parts[0] in self._dynamic_fields):
del(set_data[path])
unset_data[path] = 1
continue
@@ -1126,7 +1203,8 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
for p in parts:
if p.isdigit():
d = d[int(p)]
elif hasattr(d, '__getattribute__') and not isinstance(d, dict):
elif (hasattr(d, '__getattribute__') and
not isinstance(d, dict)):
real_path = d._reverse_db_field_map.get(p, p)
d = getattr(d, real_path)
else:
@@ -1172,7 +1250,8 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
return geo_indices
def __getstate__(self):
removals = ["get_%s_display" % k for k, v in self._fields.items() if v.choices]
removals = ("get_%s_display" % k
for k, v in self._fields.items() if v.choices)
for k in removals:
if hasattr(self, k):
delattr(self, k)
@@ -1183,9 +1262,12 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
self.__set_field_display()
def __set_field_display(self):
"""Dynamically set the display value for a field with choices"""
for attr_name, field in self._fields.items():
if field.choices: # dynamically adds a way to get the display value for a field with choices
setattr(self, 'get_%s_display' % attr_name, partial(self.__get_field_display, field=field))
if field.choices:
setattr(self,
'get_%s_display' % attr_name,
partial(self.__get_field_display, field=field))
def __get_field_display(self, field):
"""Returns the display value for a choice field"""
@@ -1257,6 +1339,11 @@ Invalid data to create a `%s` instance.\n%s""".strip() % (cls._class_name, error
return hash(self.pk)
class BasesTuple(tuple):
"""Special class to handle introspection of bases tuple in __new__"""
pass
class BaseList(list):
"""A special list so we can watch any changes
"""
@@ -1378,5 +1465,18 @@ class BaseDict(dict):
self._instance._mark_as_changed(self._name)
def subclass_exception(name, parents, module):
return type(name, parents, {'__module__': module})
def _import_class(cls_name):
"""Cached mechanism for imports"""
if cls_name in _class_registry:
return _class_registry.get(cls_name)
if cls_name == 'Document':
from mongoengine.document import Document as cls
elif cls_name == 'EmbeddedDocument':
from mongoengine.document import EmbeddedDocument as cls
elif cls_name == 'DictField':
from mongoengine.fields import DictField as cls
elif cls_name == 'OperationError':
from queryset import OperationError as cls
_class_registry[cls_name] = cls
return cls

5
mongoengine/document.py
View File

@@ -360,7 +360,9 @@ class Document(BaseDocument):
"""This method registers the delete rules to apply when removing this
object.
"""
cls._meta['delete_rules'][(document_cls, field_name)] = rule
delete_rules = cls._meta.get('delete_rules') or {}
delete_rules[(document_cls, field_name)] = rule
cls._meta['delete_rules'] = delete_rules
@classmethod
def drop_collection(cls):
@@ -392,6 +394,7 @@ class DynamicDocument(Document):
__metaclass__ = TopLevelDocumentMetaclass
_dynamic = True
meta = {'abstract': True}
def __delattr__(self, *args, **kwargs):
"""Deletes the attribute by setting to None and allowing _delta to unset

1
mongoengine/fields.py
View File

@@ -747,7 +747,6 @@ class ReferenceField(BaseField):
def prepare_query_value(self, op, value):
if value is None:
return None
return self.to_mongo(value)
def validate(self, value):

33
mongoengine/queryset.py
View File

@@ -352,7 +352,7 @@ class QuerySet(object):
# If inheritance is allowed, only return instances and instances of
# subclasses of the class being used
if document._meta.get('allow_inheritance'):
if document._meta.get('allow_inheritance') != False:
self._initial_query = {'_types': self._document._class_name}
self._loaded_fields = QueryFieldList(always_include=['_cls'])
self._cursor_obj = None
@@ -442,7 +442,7 @@ class QuerySet(object):
"""
background = self._document._meta.get('index_background', False)
drop_dups = self._document._meta.get('index_drop_dups', False)
index_opts = self._document._meta.get('index_opts', {})
index_opts = self._document._meta.get('index_opts') or {}
index_types = self._document._meta.get('index_types', True)
# determine if an index which we are creating includes
@@ -450,6 +450,7 @@ class QuerySet(object):
# an extra index on _type, as mongodb will use the existing
# index to service queries against _type
types_indexed = False
def includes_types(fields):
first_field = None
if len(fields):
@@ -466,8 +467,8 @@ class QuerySet(object):
background=background, drop_dups=drop_dups, **index_opts)
# Ensure document-defined indexes are created
if self._document._meta['indexes']:
for spec in self._document._meta['indexes']:
if self._document._meta['index_specs']:
for spec in self._document._meta['index_specs']:
types_indexed = types_indexed or includes_types(spec['fields'])
opts = index_opts.copy()
opts['unique'] = spec.get('unique', False)
@@ -498,7 +499,10 @@ class QuerySet(object):
index_list = []
direction = None
use_types = doc_cls._meta.get('allow_inheritance', True)
allow_inheritance = doc_cls._meta.get('allow_inheritance') != False
use_types = allow_inheritance
for key in spec['fields']:
# Get ASCENDING direction from +, DESCENDING from -, and GEO2D from *
direction = pymongo.ASCENDING
@@ -516,7 +520,8 @@ class QuerySet(object):
key = '_id'
else:
fields = QuerySet._lookup_field(doc_cls, parts)
parts = [field if field == '_id' else field.db_field for field in fields]
parts = [field if field == '_id' else field.db_field
for field in fields]
key = '.'.join(parts)
index_list.append((key, direction))
@@ -530,8 +535,9 @@ class QuerySet(object):
# If _types is being used, prepend it to every specified index
index_types = doc_cls._meta.get('index_types', True)
allow_inheritance = doc_cls._meta.get('allow_inheritance')
if spec.get('types', index_types) and allow_inheritance and use_types and direction is not pymongo.GEO2D:
if (spec.get('types', index_types) and allow_inheritance and use_types
and direction is not pymongo.GEO2D):
index_list.insert(0, ('_types', 1))
spec['fields'] = index_list
@@ -1329,9 +1335,10 @@ class QuerySet(object):
"""
doc = self._document
delete_rules = doc._meta.get('delete_rules') or {}
# Check for DENY rules before actually deleting/nullifying any other
# references
for rule_entry in doc._meta['delete_rules']:
for rule_entry in delete_rules:
document_cls, field_name = rule_entry
rule = doc._meta['delete_rules'][rule_entry]
if rule == DENY and document_cls.objects(**{field_name + '__in': self}).count() > 0:
@@ -1339,12 +1346,14 @@ class QuerySet(object):
(document_cls.__name__, field_name)
raise OperationError(msg)
for rule_entry in doc._meta['delete_rules']:
for rule_entry in delete_rules:
document_cls, field_name = rule_entry
rule = doc._meta['delete_rules'][rule_entry]
if rule == CASCADE:
ref_q = document_cls.objects(**{field_name + '__in': self})
if doc != document_cls or (doc == document_cls and ref_q.count() > 0):
ref_q_count = ref_q.count()
if (doc != document_cls and ref_q_count > 0
or (doc == document_cls and ref_q_count > 0)):
ref_q.delete(safe=safe)
elif rule == NULLIFY:
document_cls.objects(**{field_name + '__in': self}).update(
@@ -1915,7 +1924,7 @@ class QuerySetManager(object):
return self
# owner is the document that contains the QuerySetManager
queryset_class = owner._meta['queryset_class'] or QuerySet
queryset_class = owner._meta.get('queryset_class') or QuerySet
queryset = queryset_class(owner, owner._get_collection())
if self.get_queryset:
arg_count = self.get_queryset.func_code.co_argcount