mongoengine embeded document in a DynamicField
mongodb, mongoengine, python
Solution
In 0.8.3 you will have to manually reconstruct it, which is a bug - so I opened #449 and fixed in master. 0.8.4 is due later this week.
Problem
I try to embed a document into a dynamic field. But when I try to access it later, it's not a document object anymore, it's just a dict. Here is the example code i've just made up: ``` #defining the documents class Embed(EmbeddedDocument): field_1 = StringField(db_field='f') class Doc(Document): myid = IntField(required=True, unique=True, primary_key=True) embed_me = DynamicField(db_field='e') field_x = StringField(db_field='x') ``` Then i create a new document and save it: ``` connect('test') # the embedded part embed = Embed(field_1='this is a test') # the document with the embedded document doc = Doc(pk=2) doc.embed_me = embed doc.save() ``` So far everything is ok. This is what I get in the db: ``` # > db.doc.find() # { "_id" : 1, "e" : { "f" : "this is a test", "_cls" : "Embed" } } ``` But now, if I request the document and try to access a value from the embedded document i get an exception: ``` doc, c = Doc.objects.get_or_create(pk=1) ``` just for reference: access in the main doc works ``` print doc.field_x > None ``` also reference: the dict looks okay, except that the names from the embedded doc are not translated ``` print doc.__dict__ > {'_created': False, '_data': {'myid': 1, 'embed_me': {u'_cls': u'Embed', u'f': u'this is a test'}, 'field_x': None}, '_changed_fields': [], '_initialised': True} ``` and now, while try to access the embedded doc, the exception rises ``` print doc.embed_me.field_1 > File "embed_err.py", line 31, in <module> print doc.embed_me.field_1 AttributeError: 'dict' object has no attribute 'field_1 ``` what type is it? ``` type(doc.embed_me) > <type 'dict'> ``` It looks like the embedded document is not translated in an object. I'm not sure if this is a bug or if I misunderstand the concept. Thanks for any advice.