TypeError: cannot pickle '_thread.lock' object #542
Description
I'll start with I don't know WHY the Q object has a _thread.lock object in it ... but ...
I think this is caused by this code, and the deepcopy of the Q object:
translate_polymorphic_Q_object(queryset_model, copy.deepcopy(q), using=using) for q in args
I wonder if the code should be using q.clone() (undocumented?) or even better, q.all() (which does the same as q.clone()), which supposedly makes a copy of the query? Oops, a Q object is not a query. It's a Q().
I noticed this seems similar to issue #524 that originates at the same line of code.