Add _credential_deleted field to CredentialState

feudal/backend/migrations/0016_credentialstate__credential_deleted.py

+# Generated by Django 2.1.3 on 2018-11-07 16:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('backend', '0015_credentialstate_state_target'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='credentialstate',
+            name='_credential_deleted',
+            field=models.BooleanField(default=False),
+        ),
+    ]

feudal/backend/models/__init__.py

@@ -622,6 +622,7 @@ class CredentialState(models.Model):
         choices=TARGET_CHOICES,
         default=NOT_DEPLOYED
     )
+
     state = models.CharField(
         max_length=50,
         choices=STATE_CHOICES,
@@ -634,6 +635,10 @@ class CredentialState(models.Model):
         on_delete=models.CASCADE,
     )
 
+    _credential_deleted = models.BooleanField(
+        default=False,
+    )
+
     target = models.ForeignKey(
         NewDeploymentStateItem,
         related_name='credential_states',
@@ -661,12 +666,31 @@ class CredentialState(models.Model):
 
             return new_state
 
+    def set_target(self, target):
+        if self._credential_deleted:
+            LOGGER.debug(self.msg('Unable to change state_target of credential marked for deletion'))
+            return
+
+        self.state_target = target
+        self.save()
+
+        if settings.DEBUG_CREDENTIALS:
+            LOGGER.debug(self.msg('State target changed to {}'.format(target)))
+
     def set(self, state):
         self.state = state
         self.save()
         if settings.DEBUG_CREDENTIALS:
             LOGGER.debug(self.msg('State changed to {}'.format(state)))
 
+    def credential_deleted(self):
+        self.state_target = NOT_DEPLOYED
+        self._credential_deleted = True
+        self.save()
+
+        if settings.DEBUG_CREDENTIALS:
+            LOGGER.debug(self.msg('Credential marked as deleted'))
+
     def msg(self, message):
         return self.target.msg('Credential {}: {}'.format(self.credential, message))