Can filter by author & assignee

app/assets/javascripts/boards/components/board.js.es6

@@ -14,6 +14,13 @@
           this.board.filters = this.getFilterData();
           this.board.getIssues(true);
         }
+      },
+      'filters': {
+        handler: function () {
+          this.board.filters = this.getFilterData();
+          this.board.getIssues(true);
+        },
+        deep: true
       }
     },
     methods: {

app/assets/javascripts/boards/components/new_list_dropdown.js.es6

@@ -11,8 +11,10 @@ $(() => {
         });
       },
       renderRow: (label) => {
-        if (BoardsStore.findList('title', label.title)) return;
-        const $li = $('<li />'),
+        const isHidden = BoardsStore.findList('title', label.title),
+              $li = $('<li />', {
+                class: (isHidden ? 'hidden' : '')
+              }),
               $a = $('<a />', {
                 text: label.title,
                 href: '#'

app/assets/javascripts/boards/stores/boards_store.js.es6

@@ -3,9 +3,9 @@
     state: {
       lists: [],
       filters: {
-        author: {},
-        assignee: {},
-        milestone: {},
+        author_id: null,
+        assignee_id: null,
+        milestone_id: null,
         label: []
       }
     },

app/assets/javascripts/users_select.js

@@ -149,7 +149,9 @@
               if ($dropdown.hasClass('js-filter-bulk-update')) {
                 return;
               }
-              if ($dropdown.hasClass('js-filter-submit') && (isIssueIndex || isMRIndex)) {
+              if (page === 'projects:boards:show') {
+                BoardsStore.state.filters[$dropdown.data('field-name')] = user.id;
+              } else if ($dropdown.hasClass('js-filter-submit') && (isIssueIndex || isMRIndex)) {
                 selectedId = user.id;
                 return Issuable.filterResults($dropdown.closest('form'));
               } else if ($dropdown.hasClass('js-filter-submit')) {