Solved: %22DO_NOTHING%22 is not defined django


There is no defined behavior for the %22DO_NOTHING%22 filter in Django. This could lead to unexpected results if used in a template or view.

.db.utils.ProgrammingError: %22DO_NOTHING%22 is not defined

I'm trying to run a migration in Django, but I get the following error:
<code>django.db.utils.ProgrammingError: %22DO_NOTHING%22 is not defined</code>
The migration file looks like this:
<code># -*- coding: utf-8 -*-
# Generated by Django 1.11 on 2017-08-18 13:16
from __future__ import unicode_literals

    from django.db import migrations, models

    class Migration(migrations.Migration):

        dependencies = [("myapp", "0004_auto_20170818_1255")]

        operations = [migrations.AlterField(model_name="mymodel", name="field1", field=models.ForeignKey(null=True, on_delete=models.DO_NOTHING, related_name="+", to="myapp"))]  # noqa</code>
The model it's referring to looks like this (the field in question is <code>field1</code>) : 
<code>class MyModel(models.Model):

    field1 = models.... # other fields here</code>  # noqa

The error is saying that the DO_NOTHING option is not defined – this is likely because it’s not supported in the version of Django you’re using. To fix this, you can either update Django to a newer version, or change the on_delete option to something else that is supported.

Solve Django ‘Handler’ is not defined

This error is caused by a missing import statement in your Django project. You can fix this by adding the following line to your project’s imports section:

from django.contrib.auth.models import User

If you’re using a third-party authentication library, you may need to add its import as well.

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