[Django] #28512: save() behavior of a parent model class accessed through _ptr attribute

[Django]

#28512: save() behavior of a parent model class accessed through _ptr attribute
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Reporter: wckao | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.11
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Not sure if this is really a bug, but the behavior is not what I expected.
With model

{{{#!python
from django.db import models

class RelatedModel(models.Model):
name = models.CharField(max_length=20)

class ModelA(models.Model):
related = models.ForeignKey(RelatedModel)

def set_related(self):
self.related = RelatedModel.objects.get(name="related_model2")
self.save()

class ModelB(ModelA):
name = models.CharField(max_length=20)

def set_related(self):
self.modela_ptr.set_related()
}}}

When running the following script
{{{#!python
r1 = RelatedModel.objects.create(name="related_model1")
r2 = RelatedModel.objects.create(name="related_model2")

b1 = ModelB.objects.create(related=r1, name="b1") # b1.related.name ==
"related_model1"
b1.set_related() # b1.related.name should be
"related_model2" now
print(b1.related.name) # shows "related_model1"
}}}

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Ticket URL: <https://code.djangoproject.com/ticket/28512>
Django <https://code.djangoproject.com/>
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[Django]

#28512: save() behavior of a parent model class accessed through _ptr attribute

-------------------------------+--------------------------------------

Reporter: wckao | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.11

Severity: Normal | Resolution:

Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0

-------------------------------+--------------------------------------

Comment (by wckao):

It works if I calls b1.refresh_from_db() before accessing b1.related.name.

--
Ticket URL: <https://code.djangoproject.com/ticket/28512#comment:1>

[Django]

#28512: save() behavior of a parent model class accessed through _ptr attribute

-------------------------------+--------------------------------------
Reporter: wckao | Owner: nobody
Type: Uncategorized | Status: closed
Component: Uncategorized | Version: 1.11
Severity: Normal | Resolution: invalid

Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0

-------------------------------+--------------------------------------
Changes (by wckao):

* status: new => closed
* resolution: => invalid

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Ticket URL: <https://code.djangoproject.com/ticket/28512#comment:2>