Fixes issue not adding with milestone on board with associated milestone

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/29612

app/assets/javascripts/boards/components/board_new_issue.js

@@ -24,6 +24,7 @@ export default {
         title: this.title,
         labels,
         subscribed: true,
+        milestone_id: Store.state.currentBoard.milestone_id,
       });
 
       this.list.newIssue(issue)

app/assets/javascripts/boards/components/modal/footer.js

@@ -35,6 +35,7 @@ require('./lists_dropdown');
         // Post the data to the backend
         gl.boardService.bulkUpdate(issueIds, {
           add_label_ids: [list.label.id],
+          milestone_id: this.state.currentBoard.milestone_id,
         }).catch(() => {
           new Flash('Failed to update issues, please try again.', 'alert');
 

app/assets/javascripts/boards/models/issue.js

@@ -17,6 +17,7 @@ class ListIssue {
     this.selected = false;
     this.assignee = false;
     this.position = obj.relative_position || Infinity;
+    this.milestone_id = obj.milestone_id;
 
     if (obj.assignee) {
       this.assignee = new ListUser(obj.assignee);

app/assets/javascripts/boards/models/list.js

@@ -97,6 +97,7 @@ class List {
       .then((resp) => {
         const data = resp.json();
         issue.id = data.iid;
+        issue.milestone = data.milestone;
       });
   }
 

app/controllers/projects/boards/issues_controller.rb

@@ -74,7 +74,7 @@ module Projects
       end
 
       def issue_params
-        params.require(:issue).permit(:title).merge(board_id: params[:board_id], list_id: params[:list_id], request: request)
+        params.require(:issue).permit(:title, :milestone_id).merge(board_id: params[:board_id], list_id: params[:list_id], request: request)
       end
 
       def serialize_as_json(resource)

spec/features/boards/board_with_milestone_spec.rb

@@ -112,6 +112,53 @@ describe 'Board with milestone', :feature, :js do
     end
   end
 
+  context 'new issues' do
+    let(:label) { create(:label, project: project) }
+    let!(:list1) { create(:list, board: board, label: label, position: 0) }
+    let!(:board) { create(:board, project: project, milestone: milestone) }
+    let!(:issue) { create(:issue, project: project) }
+
+    before do
+      visit namespace_project_boards_path(project.namespace, project)
+    end
+
+    it 'creates new issue with boards milestone' do
+      wait_for_vue_resource
+
+      page.within(first('.board')) do
+        find('.btn-default').click
+
+        find('.form-control').set('testing new issue with milestone')
+
+        click_button('Submit issue')
+
+        wait_for_vue_resource
+
+        click_link('testing new issue with milestone')
+      end
+
+      expect(page).to have_content(milestone.title)
+    end
+
+    it 'updates issue with milestone from add issues modal' do
+      wait_for_vue_resource
+
+      click_button 'Add issues'
+
+      page.within('.add-issues-modal') do
+        expect(page).to have_selector('.card', count: 1)
+
+        first('.card').click
+
+        click_button 'Add 1 issue'
+      end
+
+      click_link(issue.title)
+
+      expect(page).to have_content(milestone.title)
+    end
+  end
+
   def create_board_with_milestone
     page.within '#js-multiple-boards-switcher' do
       find('.dropdown-menu-toggle').click