django - How to filter Many2Many / Generic Relations properly with Q? -

i have 3 models, taggedobject has genericrelation objecttagbridge. , objecttagbridge has foreignkey tag model.

class taggedobject(models.model):     """         class represent tagged object     """     tags = generic.genericrelation('objecttagbridge',                                    blank=true, null=true)  class objecttagbridge(models.model):     """         connect generic object tag.     """     # pylint: disable-msg=w0232,r0903     content_type = models.foreignkey(contenttype)     object_id = models.positiveintegerfield()     content_object = generic.genericforeignkey('content_type', 'object_id')     tag = models.foreignkey('tag')  class tag(models.model):     ... 

when attaching tag object, creating new objecttagbridge , set foreignkey tag tag want attach. working fine, , can tags attached object easy. when want (filter) objects have tag1 , tag2 tried this:

query = q(tags__tag=tag1) & q(tags__tag=tag2) object_list = taggedobjects.filter(query) 

but object_list empty, because looking taggedobjects have 1 objecttagbridge 2 tag objects, first tag1 , second tag2.

i application more complex q queries one, think need solution q object. in fact combination of binary conjunctions, like: (...) , ( (...) or not(...))

how can filter correctly? every answer welcome, maybe there different way achieve this.

thx help!!!

if result looking taggedobject tag1 , tag2, consider querying taggedobject instead of querying objecttagbridge. query might like:

results = taggedobject.objects.filter(objecttagbridge__tag = tag1).filter(objecttagbridge__tag = tag2) 

essentially conducting 2 filters. objects both tag1 , tag2 pass filtering criteria , part of result set.