Circular references with EmbeddedDocumentField fix

Fixes #345

docs/changelog.rst

@@ -5,6 +5,8 @@ Changelog
 Changes in dev
 ==============
 
+- Fixed issue creating indexes with recursive embedded documents
+- Fixed recursive lookup in _unique_with_indexes
 - Fixed passing ComplexField defaults to constructor for ReferenceFields
 - Fixed validation of DictField Int keys
 - Added optional cascade saving

mongoengine/base.py

@@ -687,7 +687,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
                 unique_indexes.append(index)
 
             # Grab any embedded document field unique indexes
-            if field.__class__.__name__ == "EmbeddedDocumentField":
+            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)

tests/document.py

@@ -751,6 +751,17 @@ class DocumentTest(unittest.TestCase):
         post1.save()
         BlogPost.drop_collection()
 
+    def test_recursive_embedded_objects_dont_break_indexes(self):
+
+        class RecursiveObject(EmbeddedDocument):
+            obj = EmbeddedDocumentField('self')
+
+        class RecursiveDocument(Document):
+            recursive_obj = EmbeddedDocumentField(RecursiveObject)
+
+        info = RecursiveDocument.objects._collection.index_information()
+        self.assertEqual(info.keys(), ['_id_', '_types_1'])
+
     def test_geo_indexes_recursion(self):
 
         class User(Document):