[Django] #30286: Model's ID is being overwritten when GenericForeignKey is assigned

[Django]

#30286: Model's ID is being overwritten when GenericForeignKey is assigned
-------------------------------------+-------------------------------------
               Reporter:  Samuel     |          Owner:  nobody
  Labrador                           |
                   Type:  Bug        |         Status:  new
              Component:             |        Version:  2.1
  contrib.contenttypes               |       Keywords:  GenericForeignKey
               Severity:  Normal     |  Content
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 When a Model with a GenericForeignKey field is assigned, the model's id is
 overwritten with the GenericForeignKey's id on assignment.

 I am using a mySQL database (Ver 14.14 Distrib 5.6.28), Python3(3.7.2),
 and django(2.1.7)

 Models:
 {{{
     class Incident(models.Model):
         start_timestamp = models.DateTimeField(auto_now=True)
         class Meta:
             abstract = True

     class DailyLog(Incident):
         date = models.DateField(auto_now=True)
         entries = GenericRelation(DailyLogData, object_id_field='id',
 content_type_field='incident_type')

     class Data(models.Model):
         creator = models.CharField(max_length=255)
         creator_details = models.TextField(blank=True, null=True,
 default=None)
         timestamp = models.DateTimeField(auto_now=True)
         incident_type = models.ForeignKey(ContentType,
 on_delete=models.CASCADE, primary_key=False, unique=False, blank=True,
 null=True)
         incident_object = GenericForeignKey('incident_type', 'id')
         class Meta:
             abstract = True

     class DailyLogHistory(Data):
             selections = CSVField(blank=True, null=True, default=None)

  }}}

 code that produces the bug:

 {{{
 incident = DailyLog.objects.get(id=1)

 x = DailyLogData(
         selections=['123456'],
         creator='sam',
 )
 x.save()

 print(x) # Shows the correct auto-incremented id != 1
 x.incident_object = incident
 print(x) # Shows that id == 1

 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30286>
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