Useconstraints voided in when using GenericTabularInline

[Mohamed Alnahhas]

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)