feat: edit details, roles and columns of custom view.

server/src/models/ViewColumn.js

@@ -1,3 +1,4 @@
+import { Model } from 'objection';
 import BaseModel from '@/models/Model';
 
 export default class ViewColumn extends BaseModel {
@@ -14,4 +15,26 @@ export default class ViewColumn extends BaseModel {
   static get hasTimestamps() {
     return false;
   }
+
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const ResourceField = require('@/models/ResourceField');
+
+    return {
+      /**
+       * View role model may belongs to resource field model.
+       */
+      field: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: ResourceField.default,
+        join: {
+          from: 'view_columns.fieldId',
+          to: 'resource_fields.id',
+        },
+      },
+    };
+  }
 }