forked from MongoEngine/mongoengine
/
base.py
1338 lines (1098 loc) · 49 KB
/
base.py
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import warnings
from queryset import QuerySet, QuerySetManager
from queryset import DoesNotExist, MultipleObjectsReturned
from queryset import DO_NOTHING
from mongoengine import signals
import sys
import pymongo
from bson import ObjectId
import operator
from functools import partial
from bson.dbref import DBRef
class NotRegistered(Exception):
pass
class InvalidDocumentError(Exception):
pass
class ValidationError(AssertionError):
"""Validation exception.
May represent an error validating a field or a
document containing fields with validation errors.
:ivar errors: A dictionary of errors for fields within this
document or list, or None if the error is for an
individual field.
"""
errors = {}
field_name = None
_message = None
def __init__(self, message="", **kwargs):
self.errors = kwargs.get('errors', {})
self.field_name = kwargs.get('field_name')
self.message = message
def __str__(self):
return self.message
def __repr__(self):
return '%s(%s,)' % (self.__class__.__name__, self.message)
def __getattribute__(self, name):
message = super(ValidationError, self).__getattribute__(name)
if name == 'message':
if self.field_name:
message = '%s ("%s")' % (message, self.field_name)
if self.errors:
message = '%s:\n%s' % (message, self._format_errors())
return message
def _get_message(self):
return self._message
def _set_message(self, message):
self._message = message
message = property(_get_message, _set_message)
def to_dict(self):
"""Returns a dictionary of all errors within a document
Keys are field names or list indices and values are the
validation error messages, or a nested dictionary of
errors for an embedded document or list.
"""
def build_dict(source):
errors_dict = {}
if not source:
return errors_dict
if isinstance(source, dict):
for field_name, error in source.iteritems():
errors_dict[field_name] = build_dict(error)
elif isinstance(source, ValidationError) and source.errors:
return build_dict(source.errors)
else:
return unicode(source)
return errors_dict
if not self.errors:
return {}
return build_dict(self.errors)
def _format_errors(self):
"""Returns a string listing all errors within a document"""
def format_error(field, value, prefix=''):
prefix = "%s.%s" % (prefix, field) if prefix else "%s" % field
if isinstance(value, dict):
return '\n'.join(
[format_error(k, value[k], prefix) for k in value])
else:
return "%s: %s" % (prefix, value)
return '\n'.join(
[format_error(k, v) for k, v in self.to_dict().items()])
_document_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)]
if len(possible_match) == 1:
doc = _document_registry.get(possible_match.pop(), None)
if not doc:
raise NotRegistered("""
`%s` has not been registered in the document registry.
Importing the document class automatically registers it, has it
been imported?
""".strip() % name)
return doc
class BaseField(object):
"""A base class for fields in a MongoDB document. Instances of this class
may be added to subclasses of `Document` to define a document's schema.
.. versionchanged:: 0.5 - added verbose and help text
"""
name = None
# Fields may have _types inserted into indexes by default
_index_with_types = True
_geo_index = False
# These track each time a Field instance is created. Used to retain order.
# The auto_creation_counter is used for fields that MongoEngine implicitly
# creates, creation_counter is used for all user-specified fields.
creation_counter = 0
auto_creation_counter = -1
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):
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'"
warnings.warn(msg, DeprecationWarning)
self.name = None
self.required = required or primary_key
self.default = default
self.unique = bool(unique or unique_with)
self.unique_with = unique_with
self.primary_key = primary_key
self.validation = validation
self.choices = choices
self.verbose_name = verbose_name
self.help_text = help_text
# Adjust the appropriate creation counter, and save our local copy.
if self.db_field == '_id':
self.creation_counter = BaseField.auto_creation_counter
BaseField.auto_creation_counter -= 1
else:
self.creation_counter = BaseField.creation_counter
BaseField.creation_counter += 1
def __get__(self, instance, owner):
"""Descriptor for retrieving a value from a field in a document. Do
any necessary conversion between Python and MongoDB types.
"""
if instance is None:
# Document class being used rather than a document object
return self
# Get value from document instance if available, if not use default
value = instance._data.get(self.name)
if value is None:
value = self.default
# Allow callable default values
if callable(value):
value = value()
return value
def __set__(self, instance, value):
"""Descriptor for assigning a value to a field in a document.
"""
instance._data[self.name] = value
instance._mark_as_changed(self.name)
def error(self, message="", errors=None, field_name=None):
"""Raises a ValidationError.
"""
field_name = field_name if field_name else self.name
raise ValidationError(message, errors=errors, field_name=field_name)
def to_python(self, value):
"""Convert a MongoDB-compatible type to a Python type.
"""
return value
def to_mongo(self, value):
"""Convert a Python type to a MongoDB-compatible type.
"""
return self.to_python(value)
def prepare_query_value(self, op, value):
"""Prepare a value that is being used in a query for PyMongo.
"""
return value
def validate(self, value):
"""Perform validation on a value.
"""
pass
def _validate(self, value):
from mongoengine import Document, EmbeddedDocument
# check choices
if self.choices:
is_cls = isinstance(value, (Document, EmbeddedDocument))
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]
if value_to_check not in option_keys:
self.error('Value must be %s of %s' % (err_msg, unicode(option_keys)))
elif value_to_check not in self.choices:
self.error('Value must be %s of %s' % (err_msg, unicode(self.choices)))
# check validation argument
if self.validation is not None:
if callable(self.validation):
if not self.validation(value):
self.error('Value does not match custom validation method')
else:
raise ValueError('validation argument for "%s" must be a '
'callable.' % self.name)
self.validate(value)
class ComplexBaseField(BaseField):
"""Handles complex fields, such as lists / dictionaries.
Allows for nesting of embedded documents inside complex types.
Handles the lazy dereferencing of a queryset by lazily dereferencing all
items in a list / dict rather than one at a time.
.. versionadded:: 0.5
"""
field = None
_dereference = False
def __get__(self, instance, owner):
"""Descriptor to automatically dereference references.
"""
if instance is None:
# Document class being used rather than a document object
return self
if not self._dereference and instance._initialised:
from dereference import DeReference
self._dereference = DeReference() # Cached
instance._data[self.name] = self._dereference(
instance._data.get(self.name), max_depth=1, instance=instance,
name=self.name
)
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):
value = BaseList(value, instance, self.name)
instance._data[self.name] = value
elif isinstance(value, dict) and not isinstance(value, BaseDict):
value = BaseDict(value, instance, self.name)
instance._data[self.name] = value
if self._dereference and instance._initialised and \
isinstance(value, (BaseList, BaseDict)) and not value._dereferenced:
value = self._dereference(
value, max_depth=1, instance=instance, name=self.name
)
value._dereferenced = True
instance._data[self.name] = value
return value
def __set__(self, instance, value):
"""Descriptor for assigning a value to a field in a document.
"""
instance._data[self.name] = value
instance._mark_as_changed(self.name)
def to_python(self, value):
"""Convert a MongoDB-compatible type to a Python type.
"""
from mongoengine import Document
if isinstance(value, basestring):
return value
if hasattr(value, 'to_python'):
return value.to_python()
is_list = False
if not hasattr(value, 'items'):
try:
is_list = True
value = dict([(k, v) for k, v in enumerate(value)])
except TypeError: # Not iterable return the value
return value
if self.field:
value_dict = dict([(key, self.field.to_python(item)) for key, item in value.items()])
else:
value_dict = {}
for k, v in value.items():
if isinstance(v, Document):
# We need the id from the saved object to create the DBRef
if v.pk is None:
self.error('You can only reference documents once they'
' have been saved to the database')
collection = v._get_collection_name()
value_dict[k] = DBRef(collection, v.pk)
elif hasattr(v, 'to_python'):
value_dict[k] = v.to_python()
else:
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 value_dict
def to_mongo(self, value):
"""Convert a Python type to a MongoDB-compatible type.
"""
from mongoengine import Document
if isinstance(value, basestring):
return value
if hasattr(value, 'to_mongo'):
return value.to_mongo()
is_list = False
if not hasattr(value, 'items'):
try:
is_list = True
value = dict([(k, v) for k, v in enumerate(value)])
except TypeError: # Not iterable return the value
return value
if self.field:
value_dict = dict([(key, self.field.to_mongo(item)) for key, item in value.items()])
else:
value_dict = {}
for k, v in value.items():
if isinstance(v, Document):
# We need the id from the saved object to create the DBRef
if v.pk is None:
self.error('You can only reference documents once they'
' have been saved to the database')
# 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:
from fields import GenericReferenceField
value_dict[k] = GenericReferenceField().to_mongo(v)
else:
collection = v._get_collection_name()
value_dict[k] = DBRef(collection, v.pk)
elif hasattr(v, 'to_mongo'):
value_dict[k] = v.to_mongo()
else:
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 value_dict
def validate(self, value):
"""If field is provided ensure the value is valid.
"""
errors = {}
if self.field:
if hasattr(value, 'iteritems'):
sequence = value.iteritems()
else:
sequence = enumerate(value)
for k, v in sequence:
try:
self.field._validate(v)
except (ValidationError, AssertionError), error:
if hasattr(error, 'errors'):
errors[k] = error.errors
else:
errors[k] = error
if errors:
field_class = self.field.__class__.__name__
self.error('Invalid %s item (%s)' % (field_class, value),
errors=errors)
# Don't allow empty values if required
if self.required and not value:
self.error('Field is required and cannot be empty')
def prepare_query_value(self, op, value):
return self.to_mongo(value)
def lookup_member(self, member_name):
if self.field:
return self.field.lookup_member(member_name)
return None
def _set_owner_document(self, owner_document):
if self.field:
self.field.owner_document = owner_document
self._owner_document = owner_document
def _get_owner_document(self, owner_document):
self._owner_document = owner_document
owner_document = property(_get_owner_document, _set_owner_document)
class ObjectIdField(BaseField):
"""An field wrapper around MongoDB's ObjectIds.
"""
def to_python(self, value):
return value
def to_mongo(self, value):
if not isinstance(value, ObjectId):
try:
return ObjectId(unicode(value))
except Exception, e:
# e.message attribute has been deprecated since Python 2.6
self.error(unicode(e))
return value
def prepare_query_value(self, op, value):
return self.to_mongo(value)
def validate(self, value):
try:
ObjectId(unicode(value))
except:
self.error('Invalid Object ID')
class DocumentMetaclass(type):
"""Metaclass for all documents.
"""
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('__metaclass__')
super_new = super(DocumentMetaclass, cls).__new__
if metaclass and issubclass(metaclass, DocumentMetaclass):
return super_new(cls, name, bases, attrs)
doc_fields = {}
class_name = [name]
superclasses = {}
simple_class = True
for base in bases:
# Include all fields present in superclasses
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')
attrs['_meta'] = meta
attrs['_class_name'] = doc_class_name
attrs['_superclasses'] = superclasses
# Add the document's fields to the _fields attribute
field_names = {}
for attr_name, attr_value in attrs.items():
if hasattr(attr_value, "__class__") and \
issubclass(attr_value.__class__, BaseField):
attr_value.name = attr_name
if not attr_value.db_field:
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
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))
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()])
from mongoengine import Document, EmbeddedDocument, DictField
new_class = super_new(cls, name, bases, attrs)
for field in new_class._fields.values():
field.owner_document = new_class
delete_rule = getattr(field, 'reverse_delete_rule', DO_NOTHING)
f = field
if isinstance(f, ComplexBaseField) and hasattr(f, 'field'):
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))
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)
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)
module = attrs.get('__module__')
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)
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
return new_class
def add_to_class(self, name, value):
setattr(self, name, value)
class TopLevelDocumentMetaclass(DocumentMetaclass):
"""Metaclass for top-level documents (i.e. documents that have their own
collection in the database.
"""
def __new__(cls, name, bases, attrs):
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('__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")
return super_new(cls, name, bases, attrs)
collection = ''.join('_%s' % c if c.isupper() else c for c in name).strip('_').lower()
id_field = None
abstract_base_indexes = []
base_indexes = []
base_meta = {}
# 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()
# Propagate index options.
for key in ('index_background', 'index_drop_dups', 'index_opts'):
if key in base._meta:
base_meta[key] = base._meta[key]
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', [])
# Propagate 'allow_inheritance'
if 'allow_inheritance' in base._meta:
base_meta['allow_inheritance'] = base._meta['allow_inheritance']
if 'queryset_class' in base._meta:
base_meta['queryset_class'] = base._meta['queryset_class']
try:
base_meta['objects'] = base.__getattribute__(base, 'objects')
except TypeError:
pass
except AttributeError:
pass
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', {}))
attrs['_meta'] = meta
# Set up collection manager, needs the class to have fields so use
# DocumentMetaclass before instantiating CollectionManager object
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 = 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
unique_indexes = cls._unique_with_indexes(new_class)
new_class._meta['unique_indexes'] = unique_indexes
for field_name, field in new_class._fields.items():
# Check for custom primary key
if field.primary_key:
current_pk = new_class._meta['id_field']
if current_pk and current_pk != field_name:
raise ValueError('Cannot override primary key field')
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']:
new_class._meta['id_field'] = 'id'
new_class._fields['id'] = ObjectIdField(db_field='_id')
new_class.id = new_class._fields['id']
return new_class
@classmethod
def _unique_with_indexes(cls, new_class, namespace=""):
unique_indexes = []
for field_name, field in new_class._fields.items():
# Generate a list of indexes needed by uniqueness constraints
if field.unique:
field.required = True
unique_fields = [field.db_field]
# Add any unique_with fields to the back of the index spec
if field.unique_with:
if isinstance(field.unique_with, basestring):
field.unique_with = [field.unique_with]
# Convert unique_with field names to real field names
unique_with = []
for other_name in field.unique_with:
parts = other_name.split('.')
# Lookup real name
parts = QuerySet._lookup_field(new_class, parts)
name_parts = [part.db_field for part in parts]
unique_with.append('.'.join(name_parts))
# Unique field should be required
parts[-1].required = True
unique_fields += unique_with
# Add the new index to the list
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:
field_namespace = "%s." % field_name
unique_indexes += cls._unique_with_indexes(field.document_type,
field_namespace)
return unique_indexes
class BaseDocument(object):
_dynamic = False
_created = True
_dynamic_lock = True
_initialised = False
def __init__(self, **values):
signals.pre_init.send(self.__class__, document=self, values=values)
self._data = {}
# Assign default values to instance
for attr_name, field in self._fields.items():
value = getattr(self, attr_name, None)
setattr(self, attr_name, value)
# Set passed values after initialisation
if self._dynamic:
self._dynamic_fields = {}
dynamic_data = {}
for key, value in values.items():
if key in self._fields or key == '_id':
setattr(self, key, value)
elif self._dynamic:
dynamic_data[key] = value
else:
for key, value in values.items():
key = self._reverse_db_field_map.get(key, key)
setattr(self, key, value)
# Set any get_fieldname_display methods
self.__set_field_display()
if self._dynamic:
self._dynamic_lock = False
for key, value in dynamic_data.items():
setattr(self, key, value)
# Flag initialised
self._initialised = True
signals.post_init.send(self.__class__, document=self)
def __setattr__(self, name, value):
# Handle dynamic data only if an initialised dynamic document
if self._dynamic and not self._dynamic_lock:
field = None
if not hasattr(self, name) and not name.startswith('_'):
from fields import DynamicField
field = DynamicField(db_field=name)
field.name = name
self._dynamic_fields[name] = field
if not name.startswith('_'):
value = self.__expand_dynamic_values(name, value)
# Handle marking data as changed
if name in self._dynamic_fields:
self._data[name] = value
if hasattr(self, '_changed_fields'):
self._mark_as_changed(name)
# Handle None values for required fields
if value is None and name in getattr(self, '_fields', {}):
self._data[name] = value
if hasattr(self, '_changed_fields'):
self._mark_as_changed(name)
return
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)
super(BaseDocument, self).__setattr__(name, value)
def __expand_dynamic_values(self, name, value):
"""expand any dynamic values to their correct types / values"""
if not isinstance(value, (dict, list, tuple)):
return value
is_list = False
if not hasattr(value, 'items'):
is_list = True
value = dict([(k, v) for k, v in enumerate(value)])
if not is_list and '_cls' in value:
cls = get_document(value['_cls'])
value = cls(**value)
value._dynamic = True
value._changed_fields = []
return value
data = {}
for k, v in value.items():
key = name if is_list else k
data[k] = self.__expand_dynamic_values(key, v)
if is_list: # Convert back to a list
data_items = sorted(data.items(), key=operator.itemgetter(0))
value = [v for k, v in data_items]
else:
value = data
# Convert lists / values so we can watch for any changes on them
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)
return value
def validate(self):
"""Ensure that all fields' values are valid and that required fields
are present.
"""
# Get a list of tuples of field names and their current values
fields = [(field, getattr(self, name))
for name, field in self._fields.items()]
# Ensure that each field is matched to a valid value
errors = {}
for field, value in fields:
if value is not None:
try:
field._validate(value)
except ValidationError, error:
errors[field.name] = error.errors or error
except (ValueError, AttributeError, AssertionError), error:
errors[field.name] = error
elif field.required:
errors[field.name] = ValidationError('Field is required',
field_name=field.name)
if errors:
raise ValidationError('Errors encountered validating document',
errors=errors)
def to_mongo(self):
"""Return data dictionary ready for use with MongoDB.
"""
data = {}
for field_name, field in self._fields.items():
value = getattr(self, field_name, None)
if value is not None:
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):
data['_cls'] = self._class_name
data['_types'] = self._superclasses.keys() + [self._class_name]
if '_id' in data and data['_id'] is None:
del data['_id']
if not self._dynamic:
return data
for name, field in self._dynamic_fields.items():
data[name] = field.to_mongo(self._data.get(name, None))
return data
@classmethod
def _get_collection_name(cls):
"""Returns the collection name for this class.
"""
return cls._meta.get('collection', None)
@classmethod
def _from_son(cls, son):
"""Create an instance of a Document (subclass) from a PyMongo SON.
"""
# get the class name from the document, falling back to the given
# class if unavailable
class_name = son.get('_cls', cls._class_name)
data = dict(("%s" % key, value) for key, value in son.items())
if '_types' in data:
del data['_types']
if '_cls' in data:
del data['_cls']
# Return correct subclass for document type
if class_name != cls._class_name:
cls = get_document(class_name)
changed_fields = []
errors_dict = {}
for field_name, field in cls._fields.items():
if field.db_field in data:
value = data[field.db_field]
try:
data[field_name] = (value if value is None
else field.to_python(value))
except (AttributeError, ValueError), e:
errors_dict[field_name] = e
elif field.default:
default = field.default
if callable(default):
default = default()
if isinstance(default, BaseDocument):
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))
obj = cls(**data)
obj._changed_fields = changed_fields
obj._created = False
return obj
def _mark_as_changed(self, key):
"""Marks a key as explicitly changed by the user
"""
if not key:
return
key = self._db_field_map.get(key, key)
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):
"""Returns a list of all fields that have explicitly been changed.
"""
from mongoengine import EmbeddedDocument, DynamicEmbeddedDocument
_changed_fields = []