Closes: #9047 - Add Provider Accounts (#12057)

* #9047 - ProviderAccount

* #9047 - Move to new selector types

* #9047 - Re-introduce provider FK to Circuit model

* #9047 - Fix broken tests

* Misc cleanup

* Revert errant change

* Fix tests

* Update circuit filter form

---------

Co-authored-by: jeremystretch <jstretch@netboxlabs.com>

netbox/circuits/migrations/0042_provideraccount.py

@@ -0,0 +1,91 @@
+from django.db import migrations, models
+import django.db.models.deletion
+import taggit.managers
+import utilities.json
+
+
+def create_provideraccounts_from_providers(apps, schema_editor):
+    """
+    Migrate Account in Provider model to separate account model
+    """
+    Provider = apps.get_model('circuits', 'Provider')
+    ProviderAccount = apps.get_model('circuits', 'ProviderAccount')
+
+    provider_accounts = []
+    for provider in Provider.objects.all():
+        if provider.account:
+            provider_accounts.append(ProviderAccount(
+                provider=provider,
+                account=provider.account
+            ))
+    ProviderAccount.objects.bulk_create(provider_accounts, batch_size=100)
+
+
+def restore_providers_from_provideraccounts(apps, schema_editor):
+    """
+    Restore Provider account values from auto-generated ProviderAccounts
+    """
+    ProviderAccount = apps.get_model('circuits', 'ProviderAccount')
+    provider_accounts = ProviderAccount.objects.order_by('pk')
+    for provideraccount in provider_accounts:
+        if provider_accounts.filter(provider=provideraccount.provider)[0] == provideraccount:
+            provideraccount.provider.account = provideraccount.account
+            provideraccount.provider.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extras', '0084_staging'),
+        ('circuits', '0041_standardize_description_comments'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ProviderAccount',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('created', models.DateTimeField(auto_now_add=True, null=True)),
+                ('last_updated', models.DateTimeField(auto_now=True, null=True)),
+                ('custom_field_data', models.JSONField(blank=True, default=dict, encoder=utilities.json.CustomFieldJSONEncoder)),
+                ('description', models.CharField(blank=True, max_length=200)),
+                ('comments', models.TextField(blank=True)),
+                ('account', models.CharField(max_length=100)),
+                ('name', models.CharField(blank=True, max_length=100)),
+                ('provider', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='accounts', to='circuits.provider')),
+                ('tags', taggit.managers.TaggableManager(through='extras.TaggedItem', to='extras.Tag')),
+            ],
+            options={
+                'ordering': ('provider', 'account'),
+            },
+        ),
+        migrations.AddConstraint(
+            model_name='provideraccount',
+            constraint=models.UniqueConstraint(condition=models.Q(('name', ''), _negated=True), fields=('provider', 'name'), name='circuits_provideraccount_unique_provider_name'),
+        ),
+        migrations.AddConstraint(
+            model_name='provideraccount',
+            constraint=models.UniqueConstraint(fields=('provider', 'account'), name='circuits_provideraccount_unique_provider_account'),
+        ),
+        migrations.RunPython(
+            create_provideraccounts_from_providers, restore_providers_from_provideraccounts
+        ),
+        migrations.RemoveField(
+            model_name='provider',
+            name='account',
+        ),
+        migrations.AddField(
+            model_name='circuit',
+            name='provider_account',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='circuits', to='circuits.provideraccount', null=True, blank=True),
+            preserve_default=False,
+        ),
+        migrations.AlterModelOptions(
+            name='circuit',
+            options={'ordering': ['provider', 'provider_account', 'cid']},
+        ),
+        migrations.AddConstraint(
+            model_name='circuit',
+            constraint=models.UniqueConstraint(fields=('provider_account', 'cid'), name='circuits_circuit_unique_provideraccount_cid'),
+        ),
+    ]