[Django] #29466: Textual "to" parameter of ForeignKey fails to resolve if placed in abstract model

[Django]

#29466: Textual "to" parameter of ForeignKey fails to resolve if placed in 
abstract
model
-------------------------------------+-------------------------------------
               Reporter:  Vitalik    |          Owner:  nobody
  Verhovodov                         |
                   Type:  Bug        |         Status:  new
              Component:  Database   |        Version:  2.0
  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          |
-------------------------------------+-------------------------------------
 {{{#!python
 import django
 from django.conf import settings

 settings.configure(DEBUG=True)
 django.setup()

 from django.db import models


 SHOULD_I_FAIL = True  # switch this to reproduce the bug


 class ReferencedModel(models.Model):
     field = models.FloatField()

     class Meta:
         app_label = 'myapp'


 ref = 'ReferencedModel' if SHOULD_I_FAIL else ReferencedModel


 class AbstractModel(models.Model):
     # NOTE: only abstract models are affected
     field = models.ForeignKey(ref, on_delete=models.CASCADE)

     class Meta:
         abstract = True
         app_label = 'myapp'


 class RealModel(AbstractModel):
     other_field = models.CharField(max_length=100)

     class Meta:
         app_label = 'myapp'


 ffield = AbstractModel._meta.get_field('field')
 # ValueError: Related model 'ReferencedModel' cannot be resolved
 print(ffield.target_field)
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29466>
Django <https://code.djangoproject.com/>
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