Disable built-in model permissions

netbox/users/migrations/0007_objectpermission.py

@@ -1,4 +1,4 @@
-# Generated by Django 3.0.6 on 2020-05-08 20:18
+# Generated by Django 3.0.6 on 2020-05-27 14:17
 
 from django.conf import settings
 import django.contrib.postgres.fields.jsonb
@@ -9,9 +9,9 @@ import django.db.models.deletion
 class Migration(migrations.Migration):
 
     dependencies = [
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
-        ('auth', '0011_update_proxy_permissions'),
         ('contenttypes', '0002_remove_content_type_name'),
+        ('auth', '0011_update_proxy_permissions'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
         ('users', '0006_create_userconfigs'),
     ]
 
@@ -20,7 +20,7 @@ class Migration(migrations.Migration):
             name='ObjectPermission',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
-                ('attrs', django.contrib.postgres.fields.jsonb.JSONField()),
+                ('attrs', django.contrib.postgres.fields.jsonb.JSONField(blank=True, null=True)),
                 ('can_view', models.BooleanField(default=False)),
                 ('can_add', models.BooleanField(default=False)),
                 ('can_change', models.BooleanField(default=False)),

netbox/users/models.py

@@ -240,6 +240,8 @@ class ObjectPermission(models.Model):
         on_delete=models.CASCADE
     )
     attrs = JSONField(
+        blank=True,
+        null=True,
         verbose_name='Attributes'
     )
     can_view = models.BooleanField(
@@ -264,10 +266,11 @@ class ObjectPermission(models.Model):
 
         # Validate the specified model attributes by attempting to execute a query. We don't care whether the query
         # returns anything; we just want to make sure the specified attributes are valid.
-        model = self.model.model_class()
-        try:
-            model.objects.filter(**self.attrs).exists()
-        except FieldError as e:
-            raise ValidationError({
-                'attrs': f'Invalid attributes for {model}: {e}'
-            })
+        if self.attrs:
+            model = self.model.model_class()
+            try:
+                model.objects.filter(**self.attrs).exists()
+            except FieldError as e:
+                raise ValidationError({
+                    'attrs': f'Invalid attributes for {model}: {e}'
+                })