Re: [Django] #33907: Uniqueconstraints voided in when using GenericTabularInline (was: Useconstraints voided in when using GenericTabularInline)

[Django]

#33907: Uniqueconstraints voided in when using GenericTabularInline
-------------------------------------+-------------------------------------
Reporter: Mohamed Alnahhas | Owner: nobody
Type: Bug | Status: new
Component: | Version: 4.0
contrib.contenttypes |
Severity: Release blocker | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by Mohamed Alnahhas:

Old description:

> Using Usecontraints, I get an error that the object already exist when I
> create a new object in the Skill_level admin page. However creating the
> same object through GenericTabularInline gives no errors and the creation
> is successful when it should not be. So basically Useconstraints is not
> working at all with GenericTabularInline
>
> Generic field model:
> {{{
> class Skill_level(models.Model):
> level = models.IntegerField(default=1)
> user = models.ForeignKey(User,
> related_name="skill_level",on_delete=models.CASCADE)
> content_type = models.ForeignKey(ContentType,
> on_delete=models.CASCADE)
> object_id = models.PositiveBigIntegerField()
> content_object = GenericForeignKey("content_type", "object_id")
>

> class Meta:
> indexes = [
> models.Index(fields=["content_type", "object_id"]),
> ]
> constraints = [
> UniqueConstraint(fields=['user','content_type', 'object_id'],
> name='unique_object')
> ]
> }}}
>

> Generic relation model:
>
> {{{
> class Subject(models.Model):
> title = models.CharField(max_length=100)
> skill_level = GenericRelation(Skill_level,
> related_query_name="subject")
>
> def __str__(self):
> return f"{self.title}"
> }}}
>
> Admin.py:
>
> {{{
> class Skill_levelInline(GenericTabularInline):
> model = Skill_level
> extra = 0
>
> class Skill_levelAdmin(admin.ModelAdmin):
> model = Skill_level
> fields = ['user', 'level', 'contnet_type', 'object_id',
> 'content_object']
> readonly_fields = ["content_object"]
>
> class SubjectAdmin(admin.ModelAdmin):
> inlines = [Skill_levelInline]
> extra = 0
>
> admin.site.register(Skill_level)
> admin.site.register(Subject, SubjectAdmin)
> }}}

New description:

Using Uniquecontraints, I get an error that the object already exist when
I create a new object in the Skill_level admin page. However creating the
same object through GenericTabularInline gives no errors and the creation
is successful when it should not be. So basically Useconstraints is not
working at all with GenericTabularInline

Generic field model:
{{{
class Skill_level(models.Model):
level = models.IntegerField(default=1)
user = models.ForeignKey(User,
related_name="skill_level",on_delete=models.CASCADE)
content_type = models.ForeignKey(ContentType,
on_delete=models.CASCADE)
object_id = models.PositiveBigIntegerField()
content_object = GenericForeignKey("content_type", "object_id")

class Meta:
indexes = [
models.Index(fields=["content_type", "object_id"]),
]
constraints = [
UniqueConstraint(fields=['user','content_type', 'object_id'],
name='unique_object')
]
}}}

Generic relation model:

{{{
class Subject(models.Model):
title = models.CharField(max_length=100)
skill_level = GenericRelation(Skill_level,
related_query_name="subject")

def __str__(self):
return f"{self.title}"
}}}

Admin.py:

{{{
class Skill_levelInline(GenericTabularInline):
model = Skill_level
extra = 0

class Skill_levelAdmin(admin.ModelAdmin):
model = Skill_level
fields = ['user', 'level', 'contnet_type', 'object_id',
'content_object']
readonly_fields = ["content_object"]

class SubjectAdmin(admin.ModelAdmin):
inlines = [Skill_levelInline]
extra = 0

admin.site.register(Skill_level)
admin.site.register(Subject, SubjectAdmin)
}}}

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Ticket URL: <https://code.djangoproject.com/ticket/33907#comment:1>
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