python - MongoEngine throws exception TypeError: cannot deepcopy this pattern object -


i getting exception on querying mongodb model (python/mongoengine) list , regex query. code 

from mongoengine import * import re   db = connect('testdb')  class team(document):     name = stringfield()     groups = listfield(referencefield('group'))  class group(document):     name = stringfield()  team.drop_collection() group.drop_collection()  g1 = group('g1') g1.save()  g2 = group('g2') g2.save()  g3 = group('g3') g3.save()  g4 = group('g4') g4.save()  t = team('team1',[g1,g2,g3]) t.save()  t = team('team2',[g1,g2,g4]) t.save()  t = team('team3',[]) t.save()  t = team('team3',[g3,g2]) t.save()  t = team('team3',[g4,g1]) t.save()   # typeerror: cannot deepcopy pattern object teams = team.objects( q(groups__in=[g3,g2]) & q(name=re.compile('eam3'))) team in teams:    print team.name     #-------------------------

the exception traceback 

traceback (most recent call last):   file "so_mongoengine_query.py", line 46, in <module>     team in teams:   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/queryset.py", line 81, in _iter_results     self._populate_cache()   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/queryset.py", line 93, in _populate_cache     self._result_cache.append(self.next())   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/base.py", line 1137, in next     raw_doc = self._cursor.next()   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/base.py", line 1182, in _cursor     self._cursor_obj = self._collection.find(self._query,   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/base.py", line 1215, in _query     self._mongo_query = self._query_obj.to_query(self._document)   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/visitor.py", line 91, in to_query     query = self.accept(simplificationvisitor())   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/visitor.py", line 141, in accept     return visitor.visit_combination(self)   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/visitor.py", line 41, in visit_combination     return q(**self._query_conjunction(queries))   file "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/visitor.py", line 61, in _query_conjunction     combined_query.update(copy.deepcopy(query))   file "/usr/lib/python2.7/copy.py", line 163, in deepcopy     y = copier(x, memo)   file "/usr/lib/python2.7/copy.py", line 257, in _deepcopy_dict     y[deepcopy(key, memo)] = deepcopy(value, memo)   file "/usr/lib/python2.7/copy.py", line 174, in deepcopy     y = copier(memo) typeerror: cannot deepcopy pattern object

update-1: following code generates same exception 

query = ( q(groups__in=[g3,g2]) & q(name=re.compile('eam3'))) copy.deepcopy(query)

any suggestions ? thanks

because deepcopy of compiled regex pattern not supported in python(since python 2.5), i.e.,

copy.deepcopy(re.compile('eam3'))

is not supported. mongoengine use copy.deepcopy when combine multiple query objects. if use single regex filter, query ok mongoengine, not multiples.

mongoengine support set of string queries, may find them in document.


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