I have two tables document (id, file) similarity(id1,id2,similarityvalue) where id1 and id2 are foreign keys to id of document table. I want to add a check in django(in the model) to make sure id1!=id2
Is there a way to add this in django.(sort of like adding a sql check).
From the Django Docs:
Model.clean()
""" This method should be used to provide custom model validation, and to
modify attributes on your model if desired. For instance, you could use it to
automatically provide a value for a field, or to do validation that requires
access to more than a single field: """
def clean(self):
from django.core.exceptions import ValidationError
if self.status == 'draft' and self.pub_date is not None:
raise ValidationError('Draft entries may not have a publication date.')
So for your purposes you would write something like the following for your similarity model:
def clean(self):
from django.core.exceptions import ValidationError
if self.id1 == self.id2:
raise ValidationError('Entries must compare different objects')
