MAGETWO-87573: Backport of PR-8246 for Magento 2.1: Fixes #7723 - saving multi selec… #13546

Author: Stanislav Idolov

app/code/Magento/Ui/view/base/web/js/form/form.js

@@ -38,7 +38,8 @@ define([
      * @returns {Object}
      */
     function collectData(items) {
-        var result = {};
+        var result = {},
+            name;
 
         items = Array.prototype.slice.call(items);
 
@@ -54,6 +55,11 @@ define([
                     }
                     break;
 
+                case 'select-multiple':
+                    name = item.name.substring(0, item.name.length - 2); //remove [] from the name ending
+                    result[name] = _.pluck(item.selectedOptions, 'value');
+                    break;
+
                 default:
                     result[item.name] = item.value;
             }