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2 changes: 1 addition & 1 deletion mongoengine/base/datastructures.py
Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,7 @@ def __getitem__(self, key, *args, **kwargs):
value = super(BaseList, self).__getitem__(key)

EmbeddedDocument = _import_class('EmbeddedDocument')
if isinstance(value, EmbeddedDocument) and value._instance is None:
if isinstance(value, EmbeddedDocument) and getattr(value, '_instance', None) is None:
value._instance = self._instance
elif not isinstance(value, BaseDict) and isinstance(value, dict):
value = BaseDict(value, None, '%s.%s' % (self._name, key))
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2 changes: 1 addition & 1 deletion mongoengine/base/document.py
Original file line number Diff line number Diff line change
Expand Up @@ -491,7 +491,7 @@ def _mark_as_changed(self, key):
# remove lower level changed fields
level = '.'.join(levels[:idx]) + '.'
remove = self._changed_fields.remove
for field in self._changed_fields:
for field in copy.copy(self._changed_fields):
if field.startswith(level):
remove(field)

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7 changes: 7 additions & 0 deletions mongoengine/fields.py
Original file line number Diff line number Diff line change
Expand Up @@ -566,6 +566,13 @@ def lookup_member(self, member_name):
return self.document_type._fields.get(member_name)

def prepare_query_value(self, op, value):

if value is None:
return value

if isinstance(value, list) and len(value) == 0:

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can't these two if statements be merged?

return value

if not isinstance(value, self.document_type):
value = self.document_type._from_son(value)
super(EmbeddedDocumentField, self).prepare_query_value(op, value)
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