update content loading and error handling

unwind error handling

use auth cookie as source of truth, fetch config only when authenticated

src/api/mixins/Notifications.mixin.js

@@ -26,6 +26,36 @@ const NotificationsMixin = (parent) => class extends parent {
   disassociateNotificationTemplatesError (resourceId, notificationId) {
     return this.http.post(`${this.baseUrl}${resourceId}/notification_templates_error/`, { id: notificationId, disassociate: true });
   }
+
+  /**
+  * This is a helper method meant to simplify setting the "on" or "off" status of
+  * a related notification.
+  *
+  * @param[resourceId] - id of the base resource
+  * @param[notificationId] - id of the notification
+  * @param[notificationType] - the type of notification, options are "success" and "error"
+  * @param[associationState] - Boolean for associating or disassociating, options are true or false
+  */
+  // eslint-disable-next-line max-len
+  updateNotificationTemplateAssociation (resourceId, notificationId, notificationType, associationState) {
+    if (notificationType === 'success' && associationState === true) {
+      return this.associateNotificationTemplatesSuccess(resourceId, notificationId);
+    }
+
+    if (notificationType === 'success' && associationState === false) {
+      return this.disassociateNotificationTemplatesSuccess(resourceId, notificationId);
+    }
+
+    if (notificationType === 'error' && associationState === true) {
+      return this.associateNotificationTemplatesError(resourceId, notificationId);
+    }
+
+    if (notificationType === 'error' && associationState === false) {
+      return this.disassociateNotificationTemplatesSuccess(resourceId, notificationId);
+    }
+
+    throw new Error(`Unsupported notificationType, associationState combination: ${notificationType}, ${associationState}`);
+  }
 };
 
 export default NotificationsMixin;