#31581: Queryset bug when using Q()?
               Reporter:  Javier     |          Owner:  nobody
  Buzzi                              |
                   Type:  Bug        |         Status:  new
              Component:  Database   |        Version:  3.0
  layer (models, ORM)                |
               Severity:  Normal     |       Keywords:
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
 I ran this on all the "recent" versions of python and i see the issue on
 all of them. At this point, im not 100% sure if it is a problem or not, i
 ran across this trying to show some counts in the Admin that had some
 search_fields that traversed the model backwards and forwards in order to
 match the thing properly.

 This is my mocked models of the issue:

 class ModelA(models.Model):
     somecriteria = models.CharField(max_length=50)

 class ModelC(models.Model):
     unimportant = models.CharField(max_length=50)

 class ModelB(models.Model):
     somerelation = models.ForeignKey(ModelA, on_delete=models.CASCADE)
     m2m = models.ManyToManyField(

 class ModelBC(models.Model):
     b = models.ForeignKey(ModelB, on_delete=models.CASCADE)
     c = models.ForeignKey(ModelC, on_delete=models.CASCADE)

 The "bug" is shown when i do:

 queryset =
 queryset = queryset.filter(Q(modelbc__c__unimportant='1') |

 When i do:

 queryset =
 queryset = queryset.filter(modelbc__c__unimportant='1',

 it works as expected.

 My testing arena can be found here:
 https://gist.github.com/kingbuzzman/9fe5470e31a421aa88b2a64e5447e147  see
 the comments, for the way to run it.

Ticket URL: <https://code.djangoproject.com/ticket/31581>
Django <https://code.djangoproject.com/>
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