Added support for expando style dynamic documents.

Added two new classes: DynamicDocument and DynamicEmbeddedDocument
for handling expando style setting of attributes.

[closes #112]

docs/apireference.rst

@@ -21,6 +21,12 @@ Documents
 .. autoclass:: mongoengine.EmbeddedDocument
    :members:
 
+.. autoclass:: mongoengine.DynamicDocument
+   :members:
+
+.. autoclass:: mongoengine.DynamicEmbeddedDocument
+   :members:
+
 .. autoclass:: mongoengine.document.MapReduceDocument
   :members:
 

docs/changelog.rst

@@ -2,6 +2,11 @@
 Changelog
 =========
 
+Changes in dev
+==============
+
+- Added DynamicDocument and EmbeddedDynamicDocument classes for expando schemas
+
 Changes in v0.5
 ===============
 

docs/guide/defining-documents.rst

@@ -24,6 +24,34 @@ objects** as class attributes to the document class::
         title = StringField(max_length=200, required=True)
         date_modified = DateTimeField(default=datetime.datetime.now)
 
+Dynamic document schemas
+========================
+One of the benefits of MongoDb is dynamic schemas for a collection, whilst data
+should be planned and organised (after all explicit is better than implicit!)
+there are scenarios where having dynamic / expando style documents is desirable.
+
+:class:`~mongoengine.DynamicDocument` documents work in the same way as
+:class:`~mongoengine.Document` but any data / attributes set to them will also
+be saved ::
+
+    from mongoengine import *
+
+    class Page(DynamicDocument):
+        title = StringField(max_length=200, required=True)
+
+    # Create a new page and add tags
+    >>> page = Page(title='Using MongoEngine')
+    >>> page.tags = ['mongodb', 'mongoengine']
+    >>> page.save()
+
+    >>> Page.objects(tags='mongoengine').count()
+    >>> 1
+
+..note::
+
+   There is one caveat on Dynamic Documents: fields cannot start with `_`
+
+
 Fields
 ======
 By default, fields are not required. To make a field mandatory, set the

docs/upgrade.rst

@@ -2,6 +2,11 @@
 Upgrading
 =========
 
+0.5 to 0.6
+==========
+
+TBC
+
 0.4 to 0.5
 ===========
 

mongoengine/base.py

@@ -301,6 +301,40 @@ class ComplexBaseField(BaseField):
     owner_document = property(_get_owner_document, _set_owner_document)
 
 
+class BaseDynamicField(BaseField):
+    """Used by :class:`~mongoengine.DynamicDocument` to handle dynamic data"""
+
+    def to_mongo(self, value):
+        """Convert a Python type to a MongoDBcompatible type.
+        """
+
+        if isinstance(value, basestring):
+            return value
+
+        if hasattr(value, 'to_mongo'):
+            return value.to_mongo()
+
+        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)])
+
+        data = {}
+        for k, v in value.items():
+            data[k] = self.to_mongo(v)
+
+        if is_list:  # Convert back to a list
+            value = [v for k, v in sorted(data.items(), key=operator.itemgetter(0))]
+        else:
+            value = data
+        return value
+
+    def lookup_member(self, member_name):
+        return member_name
+
 class ObjectIdField(BaseField):
     """An field wrapper around MongoDB's ObjectIds.
     """
@@ -585,30 +619,98 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
 
 class BaseDocument(object):
 
+    _dynamic = False
+
     def __init__(self, **values):
         signals.pre_init.send(self.__class__, document=self, values=values)
 
         self._data = {}
         self._initialised = False
+
         # Assign default values to instance
         for attr_name, field in self._fields.items():
             value = getattr(self, attr_name, None)
             setattr(self, attr_name, value)
 
-        # Assign initial values to instance
-        for attr_name in values.keys():
-            try:
-                value = values.pop(attr_name)
-                setattr(self, attr_name, value)
-            except AttributeError:
-                pass
+        # 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():
+                setattr(self, key, value)
 
-        # Set any get_fieldname_display methods
+        # Set any get_fieldname_display methodsF
         self.__set_field_display()
         # Flag initialised
         self._initialised = True
+
+        if self._dynamic:
+            for key, value in dynamic_data.items():
+                setattr(self, key, value)
         signals.post_init.send(self.__class__, document=self)
 
+    def __setattr__(self, name, value):
+        # Handle dynamic data only if an intialised dynamic document
+        if self._dynamic and getattr(self, '_initialised', False):
+
+            field = None
+            if not hasattr(self, name) and not name.startswith('_'):
+                field = BaseDynamicField(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)
+
+        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
+            value = [v for k, v in sorted(data.items(), key=operator.itemgetter(0))]
+        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, instance=self, name=name)
+        elif isinstance(value, dict) and not isinstance(value, BaseDict):
+            value = BaseDict(value, instance=self, name=name)
+
+        return value
+
     def validate(self):
         """Ensure that all fields' values are valid and that required fields
         are present.
@@ -653,6 +755,12 @@ class BaseDocument(object):
             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
@@ -727,14 +835,19 @@ class BaseDocument(object):
     def _get_changed_fields(self, key=''):
         """Returns a list of all fields that have explicitly been changed.
         """
-        from mongoengine import EmbeddedDocument
+        from mongoengine import EmbeddedDocument, DynamicEmbeddedDocument
         _changed_fields = []
         _changed_fields += getattr(self, '_changed_fields', [])
-        for field_name in self._fields:
+
+        field_list = self._fields.copy()
+        if self._dynamic:
+            field_list.update(self._dynamic_fields)
+
+        for field_name in field_list:
             db_field_name = self._db_field_map.get(field_name, field_name)
             key = '%s.' % db_field_name
             field = getattr(self, field_name, None)
-            if isinstance(field, EmbeddedDocument) and db_field_name not in _changed_fields:  # Grab all embedded fields that have been changed
+            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) 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
@@ -747,7 +860,6 @@ class BaseDocument(object):
                         continue
                     list_key = "%s%s." % (key, index)
                     _changed_fields += ["%s%s" % (list_key, k) for k in value._get_changed_fields(list_key) if k]
-
         return _changed_fields
 
     def _delta(self):
@@ -785,8 +897,11 @@ class BaseDocument(object):
 
             # If we've set a value that ain't the default value dont unset it.
             default = None
-
-            if path in self._fields:
+            if self._dynamic and parts[0] in self._dynamic_fields:
+                del(set_data[path])
+                unset_data[path] = 1
+                continue
+            elif path in self._fields:
                 default = self._fields[path].default
             else:  # Perform a full lookup for lists / embedded lookups
                 d = self
@@ -805,7 +920,10 @@ class BaseDocument(object):
                     field_name = d._reverse_db_field_map.get(db_field_name,
                                                              db_field_name)
 
-                    default = d._fields[field_name].default
+                    if field_name in d._fields:
+                        default = d._fields.get(field_name).default
+                    else:
+                        default = None
 
             if default is not None:
                 if callable(default):

mongoengine/document.py

@@ -1,13 +1,14 @@
+import operator
 from mongoengine import signals
 from base import (DocumentMetaclass, TopLevelDocumentMetaclass, BaseDocument,
-                  ValidationError, BaseDict, BaseList)
+                  ValidationError, BaseDict, BaseList, BaseDynamicField)
 from queryset import OperationError
 from connection import _get_db
 
 import pymongo
 
-__all__ = ['Document', 'EmbeddedDocument', 'ValidationError',
-           'OperationError', 'InvalidCollectionError']
+__all__ = ['Document', 'EmbeddedDocument', 'DynamicDocument', 'DynamicEmbeddedDocument',
+           'ValidationError', 'OperationError', 'InvalidCollectionError']
 
 
 class InvalidCollectionError(Exception):
@@ -198,6 +199,7 @@ class Document(BaseDocument):
                     reset_changed_fields(field, inspected_docs)
 
         reset_changed_fields(self)
+        self._changed_fields = []
         signals.post_save.send(self.__class__, document=self, created=creation_mode)
 
     def update(self, **kwargs):
@@ -247,8 +249,12 @@ class Document(BaseDocument):
         """
         id_field = self._meta['id_field']
         obj = self.__class__.objects(**{id_field: self[id_field]}).first()
+
         for field in self._fields:
             setattr(self, field, self._reload(field, obj[field]))
+        if self._dynamic:
+            for name in self._dynamic_fields.keys():
+                setattr(self, name, self._reload(name, obj._data[name]))
         self._changed_fields = []
 
     def _reload(self, key, value):
@@ -261,7 +267,7 @@ class Document(BaseDocument):
         elif isinstance(value, BaseList):
             value = [self._reload(key, v) for v in value]
             value = BaseList(value, instance=self, name=key)
-        elif isinstance(value, EmbeddedDocument):
+        elif isinstance(value, (EmbeddedDocument, DynamicEmbeddedDocument)):
             value._changed_fields = []
         return value
 
@@ -289,6 +295,39 @@ class Document(BaseDocument):
         db.drop_collection(cls._get_collection_name())
 
 
+class DynamicDocument(Document):
+    """A Dynamic Document class allowing flexible, expandable and uncontrolled
+    schemas.  As a :class:`~mongoengine.Document` subclass, acts in the same
+    way as an ordinary document but has expando style properties.  Any data
+    passed or set against the :class:`~mongoengine.DynamicDocument` that is
+    not a field is automatically converted into a
+    :class:`~mongoengine.BaseDynamicField` and data can be attributed to that
+    field.
+
+    ..note::
+
+        There is one caveat on Dynamic Documents: fields cannot start with `_`
+    """
+    __metaclass__ = TopLevelDocumentMetaclass
+    _dynamic = True
+
+
+class DynamicEmbeddedDocument(EmbeddedDocument):
+    """A Dynamic Embedded Document class allowing flexible, expandable and
+    uncontrolled schemas. See :class:`~mongoengine.DynamicDocument` for more
+    information about dynamic documents.
+    """
+
+    __metaclass__ = DocumentMetaclass
+    _dynamic = True
+
+    def __delattr__(self, *args, **kwargs):
+        """Deletes the attribute by setting to None and allowing _delta to unset
+        it"""
+        field_name = args[0]
+        setattr(self, field_name, None)
+
+
 class MapReduceDocument(object):
     """A document returned from a map/reduce query.
 

mongoengine/queryset.py

@@ -590,7 +590,14 @@ class QuerySet(object):
                 if field_name == 'pk':
                     # Deal with "primary key" alias
                     field_name = document._meta['id_field']
-                field = document._fields[field_name]
+                if field_name in document._fields:
+                    field = document._fields[field_name]
+                elif document._dynamic:
+                    from base import BaseDynamicField
+                    field = BaseDynamicField(db_field=field_name)
+                else:
+                    raise InvalidQueryError('Cannot resolve field "%s"'
+                                                % field_name)
             else:
                 # Look up subfield on the previous field
                 new_field = field.lookup_member(field_name)
@@ -603,7 +610,6 @@ class QuerySet(object):
                                                 % field_name)
                 field = new_field  # update field to the new field type
             fields.append(field)
-
         return fields
 
     @classmethod

tests/dynamic_document.py

@@ -0,0 +1,413 @@
+import unittest
+
+from mongoengine import *
+from mongoengine.connection import _get_db
+
+class DynamicDocTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = _get_db()
+
+        class Person(DynamicDocument):
+            name = StringField()
+
+        Person.drop_collection()
+
+        self.Person = Person
+
+    def test_simple_dynamic_document(self):
+        """Ensures simple dynamic documents are saved correctly"""
+
+        p = self.Person()
+        p.name = "James"
+        p.age = 34
+
+        self.assertEquals(p.to_mongo(),
+            {"_types": ["Person"], "_cls": "Person",
+             "name": "James", "age": 34}
+        )
+
+        p.save()
+
+        self.assertEquals(self.Person.objects.first().age, 34)
+
+        # Confirm no changes to self.Person
+        self.assertFalse(hasattr(self.Person, 'age'))
+
+    def test_change_scope_of_variable(self):
+        """Test changing the scope of a dynamic field has no adverse effects"""
+        p = self.Person()
+        p.name = "Dean"
+        p.misc = 22
+        p.save()
+
+        p = self.Person.objects.get()
+        p.misc = {'hello': 'world'}
+        p.save()
+
+        p = self.Person.objects.get()
+        self.assertEquals(p.misc, {'hello': 'world'})
+
+    def test_dynamic_document_queries(self):
+        """Ensure we can query dynamic fields"""
+        p = self.Person()
+        p.name = "Dean"
+        p.age = 22
+        p.save()
+
+        self.assertEquals(1, self.Person.objects(age=22).count())
+        p = self.Person.objects(age=22)
+        p = p.get()
+        self.assertEquals(22, p.age)
+
+    def test_complex_data_lookups(self):
+        """Ensure you can query dynamic document dynamic fields"""
+        p = self.Person()
+        p.misc = {'hello': 'world'}
+        p.save()
+
+        self.assertEquals(1, self.Person.objects(misc__hello='world').count())
+
+    def test_inheritance(self):
+        """Ensure that dynamic document plays nice with inheritance"""
+        class Employee(self.Person):
+            salary = IntField()
+
+        Employee.drop_collection()
+
+        self.assertTrue('name' in Employee._fields)
+        self.assertTrue('salary' in Employee._fields)
+        self.assertEqual(Employee._get_collection_name(),
+                         self.Person._get_collection_name())
+
+        joe_bloggs = Employee()
+        joe_bloggs.name = "Joe Bloggs"
+        joe_bloggs.salary = 10
+        joe_bloggs.age = 20
+        joe_bloggs.save()
+
+        self.assertEquals(1, self.Person.objects(age=20).count())
+        self.assertEquals(1, Employee.objects(age=20).count())
+
+        joe_bloggs = self.Person.objects.first()
+        self.assertTrue(isinstance(joe_bloggs, Employee))
+
+    def test_embedded_dynamic_document(self):
+        """Test dynamic embedded documents"""
+        class Embedded(DynamicEmbeddedDocument):
+            pass
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEquals(doc.to_mongo(), {"_types": ['Doc'], "_cls": "Doc",
+            "embedded_field": {
+                "_types": ['Embedded'], "_cls": "Embedded",
+                "string_field": "hello",
+                "int_field": 1,
+                "dict_field": {"hello": "world"},
+                "list_field": ['1', 2, {'hello': 'world'}]
+            }
+        })
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEquals(doc.embedded_field.__class__, Embedded)
+        self.assertEquals(doc.embedded_field.string_field, "hello")
+        self.assertEquals(doc.embedded_field.int_field, 1)
+        self.assertEquals(doc.embedded_field.dict_field, {'hello': 'world'})
+        self.assertEquals(doc.embedded_field.list_field, ['1', 2, {'hello': 'world'}])
+
+    def test_complex_embedded_documents(self):
+        """Test complex dynamic embedded documents setups"""
+        class Embedded(DynamicEmbeddedDocument):
+            pass
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        embedded_1.list_field = ['1', 2, embedded_2]
+        doc.embedded_field = embedded_1
+
+        self.assertEquals(doc.to_mongo(), {"_types": ['Doc'], "_cls": "Doc",
+            "embedded_field": {
+                "_types": ['Embedded'], "_cls": "Embedded",
+                "string_field": "hello",
+                "int_field": 1,
+                "dict_field": {"hello": "world"},
+                "list_field": ['1', 2,
+                    {"_types": ['Embedded'], "_cls": "Embedded",
+                    "string_field": "hello",
+                    "int_field": 1,
+                    "dict_field": {"hello": "world"},
+                    "list_field": ['1', 2, {'hello': 'world'}]}
+                ]
+            }
+        })
+        doc.save()
+        doc = Doc.objects.first()
+        self.assertEquals(doc.embedded_field.__class__, Embedded)
+        self.assertEquals(doc.embedded_field.string_field, "hello")
+        self.assertEquals(doc.embedded_field.int_field, 1)
+        self.assertEquals(doc.embedded_field.dict_field, {'hello': 'world'})
+        self.assertEquals(doc.embedded_field.list_field[0], '1')
+        self.assertEquals(doc.embedded_field.list_field[1], 2)
+
+        embedded_field = doc.embedded_field.list_field[2]
+
+        self.assertEquals(embedded_field.__class__, Embedded)
+        self.assertEquals(embedded_field.string_field, "hello")
+        self.assertEquals(embedded_field.int_field, 1)
+        self.assertEquals(embedded_field.dict_field, {'hello': 'world'})
+        self.assertEquals(embedded_field.list_field, ['1', 2, {'hello': 'world'}])
+
+    def test_delta_for_dynamic_documents(self):
+        p = self.Person()
+        p.name = "Dean"
+        p.age = 22
+        p.save()
+
+        p.age = 24
+        self.assertEquals(p.age, 24)
+        self.assertEquals(p._get_changed_fields(), ['age'])
+        self.assertEquals(p._delta(), ({'age': 24}, {}))
+
+        p = self.Person.objects(age=22).get()
+        p.age = 24
+        self.assertEquals(p.age, 24)
+        self.assertEquals(p._get_changed_fields(), ['age'])
+        self.assertEquals(p._delta(), ({'age': 24}, {}))
+
+        p.save()
+        self.assertEquals(1, self.Person.objects(age=24).count())
+
+    def test_delta(self):
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEquals(doc._get_changed_fields(), [])
+        self.assertEquals(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEquals(doc._get_changed_fields(), ['string_field'])
+        self.assertEquals(doc._delta(), ({'string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEquals(doc._get_changed_fields(), ['int_field'])
+        self.assertEquals(doc._delta(), ({'int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEquals(doc._get_changed_fields(), ['dict_field'])
+        self.assertEquals(doc._delta(), ({'dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEquals(doc._get_changed_fields(), ['list_field'])
+        self.assertEquals(doc._delta(), ({'list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEquals(doc._get_changed_fields(), ['dict_field'])
+        self.assertEquals(doc._delta(), ({}, {'dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEquals(doc._get_changed_fields(), ['list_field'])
+        self.assertEquals(doc._delta(), ({}, {'list_field': 1}))
+
+    def test_delta_recursive(self):
+        """Testing deltaing works with dynamic documents"""
+        class Embedded(DynamicEmbeddedDocument):
+            pass
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEquals(doc._get_changed_fields(), [])
+        self.assertEquals(doc._delta(), ({}, {}))
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEquals(doc._get_changed_fields(), ['embedded_field'])
+
+        embedded_delta = {
+            '_types': ['Embedded'],
+            '_cls': 'Embedded',
+            'string_field': 'hello',
+            'int_field': 1,
+            'dict_field': {'hello': 'world'},
+            'list_field': ['1', 2, {'hello': 'world'}]
+        }
+        self.assertEquals(doc.embedded_field._delta(), (embedded_delta, {}))
+        self.assertEquals(doc._delta(), ({'embedded_field': embedded_delta}, {}))
+
+        doc.save()
+        doc.reload()
+
+        doc.embedded_field.dict_field = {}
+        self.assertEquals(doc._get_changed_fields(), ['embedded_field.dict_field'])
+        self.assertEquals(doc.embedded_field._delta(), ({}, {'dict_field': 1}))
+
+        self.assertEquals(doc._delta(), ({}, {'embedded_field.dict_field': 1}))
+        doc.save()
+        doc.reload()
+
+        doc.embedded_field.list_field = []
+        self.assertEquals(doc._get_changed_fields(), ['embedded_field.list_field'])
+        self.assertEquals(doc.embedded_field._delta(), ({}, {'list_field': 1}))
+        self.assertEquals(doc._delta(), ({}, {'embedded_field.list_field': 1}))
+        doc.save()
+        doc.reload()
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        doc.embedded_field.list_field = ['1', 2, embedded_2]
+        self.assertEquals(doc._get_changed_fields(), ['embedded_field.list_field'])
+        self.assertEquals(doc.embedded_field._delta(), ({
+            'list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                '_types': ['Embedded'],
+                'string_field': 'hello',
+                'dict_field': {'hello': 'world'},
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+
+        self.assertEquals(doc._delta(), ({
+            'embedded_field.list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                 '_types': ['Embedded'],
+                 'string_field': 'hello',
+                 'dict_field': {'hello': 'world'},
+                 'int_field': 1,
+                 'list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+        doc.save()
+        doc.reload()
+
+        self.assertEquals(doc.embedded_field.list_field[2]._changed_fields, [])
+        self.assertEquals(doc.embedded_field.list_field[0], '1')
+        self.assertEquals(doc.embedded_field.list_field[1], 2)
+        for k in doc.embedded_field.list_field[2]._fields:
+            self.assertEquals(doc.embedded_field.list_field[2][k], embedded_2[k])
+
+        doc.embedded_field.list_field[2].string_field = 'world'
+        self.assertEquals(doc._get_changed_fields(), ['embedded_field.list_field.2.string_field'])
+        self.assertEquals(doc.embedded_field._delta(), ({'list_field.2.string_field': 'world'}, {}))
+        self.assertEquals(doc._delta(), ({'embedded_field.list_field.2.string_field': 'world'}, {}))
+        doc.save()
+        doc.reload()
+        self.assertEquals(doc.embedded_field.list_field[2].string_field, 'world')
+
+        # Test multiple assignments
+        doc.embedded_field.list_field[2].string_field = 'hello world'
+        doc.embedded_field.list_field[2] = doc.embedded_field.list_field[2]
+        self.assertEquals(doc._get_changed_fields(), ['embedded_field.list_field'])
+        self.assertEquals(doc.embedded_field._delta(), ({
+            'list_field': ['1', 2, {
+            '_types': ['Embedded'],
+            '_cls': 'Embedded',
+            'string_field': 'hello world',
+            'int_field': 1,
+            'list_field': ['1', 2, {'hello': 'world'}],
+            'dict_field': {'hello': 'world'}}]}, {}))
+        self.assertEquals(doc._delta(), ({
+            'embedded_field.list_field': ['1', 2, {
+                '_types': ['Embedded'],
+                '_cls': 'Embedded',
+                'string_field': 'hello world',
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+                'dict_field': {'hello': 'world'}}
+            ]}, {}))
+        doc.save()
+        doc.reload()
+        self.assertEquals(doc.embedded_field.list_field[2].string_field, 'hello world')
+
+        # Test list native methods
+        doc.embedded_field.list_field[2].list_field.pop(0)
+        self.assertEquals(doc._delta(), ({'embedded_field.list_field.2.list_field': [2, {'hello': 'world'}]}, {}))
+        doc.save()
+        doc.reload()
+
+        doc.embedded_field.list_field[2].list_field.append(1)
+        self.assertEquals(doc._delta(), ({'embedded_field.list_field.2.list_field': [2, {'hello': 'world'}, 1]}, {}))
+        doc.save()
+        doc.reload()
+        self.assertEquals(doc.embedded_field.list_field[2].list_field, [2, {'hello': 'world'}, 1])
+
+        doc.embedded_field.list_field[2].list_field.sort()
+        doc.save()
+        doc.reload()
+        self.assertEquals(doc.embedded_field.list_field[2].list_field, [1, 2, {'hello': 'world'}])
+
+        del(doc.embedded_field.list_field[2].list_field[2]['hello'])
+        self.assertEquals(doc._delta(), ({'embedded_field.list_field.2.list_field': [1, 2, {}]}, {}))
+        doc.save()
+        doc.reload()
+
+        del(doc.embedded_field.list_field[2].list_field)
+        self.assertEquals(doc._delta(), ({}, {'embedded_field.list_field.2.list_field': 1}))
+
+        doc.save()
+        doc.reload()
+
+        doc.dict_field = {'embedded': embedded_1}
+        doc.save()
+        doc.reload()
+
+        doc.dict_field['embedded'].string_field = 'Hello World'
+        self.assertEquals(doc._get_changed_fields(), ['dict_field.embedded.string_field'])
+        self.assertEquals(doc._delta(), ({'dict_field.embedded.string_field': 'Hello World'}, {}))