migration.py

# Generated by Django 2.2.6 on 2019-12-30 05:10

from django.db import migrations

def migrate_code(apps, schema_editor):
    ContentType = apps.get_model('contenttypes', 'ContentType')
    Permission = apps.get_model('auth', 'Permission')

    ModelClass = apps.get_model('app', 'Model')
    ctype = ContentType.objects.get_for_model(ModelClass)
    if not Permission.objects.filter(content_type=ctype, codename='perm_name').exists():
        Permission.objects.create(
            content_type=ctype,
            codename='perm_name',
            name='perm title'
        )


class Migration(migrations.Migration):

    dependencies = [
        ('', ''),
    ]

    operations = [
        migrations.RunPython(migrate_code, reverse_code=migrations.RunPython.noop)
    ]