Milestone bulk editing for group issues

WIP: With this commit we will allow milestone
bulk editing for group issues. This version will
only support milestones.

app/assets/javascripts/issuable_bulk_update_actions.js

-/* eslint-disable consistent-return, func-names, array-callback-return, prefer-arrow-callback, no-unused-vars */
+/* eslint-disable consistent-return, func-names, array-callback-return, prefer-arrow-callback */
 
 import $ from 'jquery';
 import _ from 'underscore';
@@ -7,7 +7,7 @@ import Flash from './flash';
 import { __ } from './locale';
 
 export default {
-  init({ container, form, issues, prefixId } = {}) {
+  init({ form, issues, prefixId } = {}) {
     this.prefixId = prefixId || 'issue_';
     this.form = form || this.getElement('.bulk-update');
     this.$labelDropdown = this.form.find('.js-label-select');

app/assets/javascripts/issuable_index.js

@@ -2,26 +2,13 @@ import $ from 'jquery';
 import axios from './lib/utils/axios_utils';
 import flash from './flash';
 import { s__, __ } from './locale';
-import IssuableBulkUpdateSidebar from './issuable_bulk_update_sidebar';
-import IssuableBulkUpdateActions from './issuable_bulk_update_actions';
+import issuableInitBulkUpdateSidebar from './issuable_init_bulk_update_sidebar';
 
 export default class IssuableIndex {
   constructor(pagePrefix) {
-    this.initBulkUpdate(pagePrefix);
+    issuableInitBulkUpdateSidebar.init(pagePrefix);
     IssuableIndex.resetIncomingEmailToken();
   }
-  initBulkUpdate(pagePrefix) {
-    const userCanBulkUpdate = $('.issues-bulk-update').length > 0;
-    const alreadyInitialized = Boolean(this.bulkUpdateSidebar);
-
-    if (userCanBulkUpdate && !alreadyInitialized) {
-      IssuableBulkUpdateActions.init({
-        prefixId: pagePrefix,
-      });
-
-      this.bulkUpdateSidebar = new IssuableBulkUpdateSidebar();
-    }
-  }
 
   static resetIncomingEmailToken() {
     const $resetToken = $('.incoming-email-token-reset');

app/assets/javascripts/issuable_init_bulk_update_sidebar.js

+import $ from 'jquery';
+import IssuableBulkUpdateSidebar from './issuable_bulk_update_sidebar';
+import issuableBulkUpdateActions from './issuable_bulk_update_actions';
+
+export default {
+  bulkUpdateSidebar: null,
+
+  init(prefixId) {
+    const userCanBulkUpdate = $('.issues-bulk-update').length > 0;
+    const alreadyInitialized = Boolean(this.bulkUpdateSidebar);
+
+    if (userCanBulkUpdate && !alreadyInitialized) {
+      issuableBulkUpdateActions.init({ prefixId });
+
+      this.bulkUpdateSidebar = new IssuableBulkUpdateSidebar();
+    }
+  }
+}

app/assets/javascripts/pages/groups/issues/index.js

 import projectSelect from '~/project_select';
 import initFilteredSearch from '~/pages/search/init_filtered_search';
+import issuableInitBulkUpdateSidebar from '~/issuable_init_bulk_update_sidebar';
 import { FILTERED_SEARCH } from '~/pages/constants';
 import IssuableFilteredSearchTokenKeys from 'ee_else_ce/filtered_search/issuable_filtered_search_token_keys';
 
 document.addEventListener('DOMContentLoaded', () => {
   IssuableFilteredSearchTokenKeys.addExtraTokensForIssues();
 
+  // FIXME: Hardcoded prefix
+  issuableInitBulkUpdateSidebar.init('issue_');
+
   initFilteredSearch({
     page: FILTERED_SEARCH.ISSUES,
     isGroupDecendent: true,

app/views/groups/issues.html.haml

+- @project = @group.projects.first
+- @can_bulk_update = can?(current_user, :admin_issue, @project)
+
 - page_title "Issues"
 = content_for :meta_tags do
   = auto_discovery_link_tag(:atom, safe_params.merge(rss_url_options).to_h, title: "#{@group.name} issues")
@@ -9,8 +12,15 @@
     = render 'shared/issuable/nav', type: :issues
     .nav-controls
       = render 'shared/issuable/feed_buttons'
+
+      - if @can_bulk_update
+        = button_tag _('Edit issues'), class: 'btn btn-default append-right-10 js-bulk-update-toggle'
+
       = render 'shared/new_project_item_select', path: 'issues/new', label: "New issue", type: :issues, with_feature_enabled: 'issues', with_shared: false, include_projects_in_subgroups: true
 
   = render 'shared/issuable/search_bar', type: :issues
 
+  - if @can_bulk_update
+    = render 'shared/issuable/bulk_update_sidebar', type: :issues
+
   = render 'shared/issues'