Custom fields feature.

server/src/models/ResourceField.js

@@ -0,0 +1,37 @@
+import { snakeCase } from 'lodash';
+import bookshelf from './bookshelf';
+
+const ResourceField = bookshelf.Model.extend({
+  /**
+   * Table name.
+   */
+  tableName: 'resource_fields',
+
+  /**
+   * Timestamp columns.
+   */
+  hasTimestamps: false,
+
+  virtuals: {
+    /**
+     * Resource field key.
+     */
+    key() {
+      return snakeCase(this.attributes.label_name);
+    },
+  },
+
+  /**
+   * Resource field may belongs to resource model.
+   */
+  resource() {
+    return this.belongsTo('Resource', 'resource_id');
+  },
+}, {
+  /**
+   * JSON Columns.
+   */
+  jsonColumns: ['options'],
+});
+
+export default bookshelf.model('ResourceField', ResourceField);