use handleClick properly for users select

app/assets/javascripts/boards/components/user_select.vue

@@ -44,7 +44,8 @@ export default {
     },
     selected: {
       type: Object,
-      required: true,
+      required: false,
+      default: () => ({}),
     },
     wrapperClass: {
       type: String,
@@ -62,25 +63,24 @@ export default {
     },
   },
   watch: {
-    selected: {
-      handler() {
+    selected() {
       this.initSelect();
     },
-      deep: true,
-    },
   },
   methods: {
     initSelect() {
+      this.$nextTick(() => {
         new UsersSelect(null, this.$refs.dropdown, {
           handleClick: this.selectUser,
         });
+      });
     },
     selectUser(user, isMarking) {
-      debugger
-      if (user.id || isMarking) {
+      if (isMarking) {
         gl.issueBoards.BoardsStore.boardConfig.assignee = user;
       } else {
-        gl.issueBoards.BoardsStore.boardConfig.assignee = {};
+        // correctly select "unassigned" in Assignee dropdown
+        gl.issueBoards.BoardsStore.boardConfig.assignee = { id: undefined };
       }
     },
   },
@@ -141,12 +141,12 @@ export default {
         <button
           class="dropdown-menu-toggle wide"
           ref="dropdown"
-          data-current-user="true"
+          :data-field-name="fieldName"
           :data-dropdown-title="placeholderText"
           :data-any-user="anyUserText"
           :data-group-id="groupId"
           :data-project-id="projectId"
-          :data-selected="board.assignee.id"
+          :data-selected="selected.id"
           data-toggle="dropdown"
           aria-expanded="false"
           type="button"

app/assets/javascripts/users_select.js

@@ -377,9 +377,9 @@ function UsersSelect(currentUser, els, options = {}) {
         },
         multiSelect: $dropdown.hasClass('js-multiselect'),
         inputMeta: $dropdown.data('input-meta'),
-        clicked: function(clickEvent) {
-          const { $el, e, isMarking } = clickEvent;
-          const user = clickEvent.selectedObj;
+        clicked: function(options) {
+          const { $el, e, isMarking } = options;
+          const user = options.selectedObj;
 
           if ($dropdown.hasClass('js-multiselect')) {
             const isActive = $el.hasClass('is-active');