Merge branch 'move-project-dropdown-async' into 'master'

Loads move issue dropdown async

To keep the style of the dropdown the same as the other dropdowns in the issue form, it uses select2 rather than our new dropdowns.

![dropdown](/uploads/e80d5f48440b2a49fd3ac13e74c1ba55/dropdown.gif)

Closes #16563

See merge request !4160

app/assets/javascripts/issuable_form.js.coffee

@@ -19,6 +19,7 @@ class @IssuableForm
     @form.on "click", ".btn-cancel", @resetAutosave
 
     @initWip()
+    @initMoveDropdown()
 
     $issuableDueDate = $('#issuable-due-date')
 
@@ -89,3 +90,19 @@ class @IssuableForm
 
   addWip: ->
     @titleField.val "WIP: #{@titleField.val()}"
+
+  initMoveDropdown: ->
+    $moveDropdown = $('.js-move-dropdown')
+
+    if $moveDropdown.length
+      $('.js-move-dropdown').select2
+        ajax:
+          url: $moveDropdown.data('projects-url')
+          results: (data) ->
+            return {
+              results: data
+            }
+        formatResult: (project) ->
+          project.name_with_namespace
+        formatSelection: (project) ->
+          project.name_with_namespace

app/controllers/autocomplete_controller.rb

@@ -31,6 +31,24 @@ class AutocompleteController < ApplicationController
     render json: @user, only: [:name, :username, :id], methods: [:avatar_url]
   end
 
+  def projects
+    project = Project.find_by_id(params[:project_id])
+
+    projects = current_user.authorized_projects
+    projects = projects.select do |project|
+      current_user.can?(:admin_issue, project)
+    end
+
+    no_project = {
+      id: 0,
+      name_with_namespace: 'No project',
+    }
+    projects.unshift(no_project)
+    projects.delete(project)
+
+    render json: projects.to_json(only: [:id, :name_with_namespace], methods: :name_with_namespace)
+  end
+
   private
 
   def find_users

app/views/shared/issuable/_form.html.haml

@@ -98,9 +98,7 @@
     = label_tag :move_to_project_id, 'Move', class: 'control-label'
     .col-sm-10
       .issuable-form-select-holder
-        - projects = project_options(issuable, current_user, ability: :admin_issue)
+        = hidden_field_tag :move_to_project_id, nil, class: 'js-move-dropdown', data: { placeholder: 'Select project', projects_url: autocomplete_projects_path(project_id: @project.id) }
-        = select_tag(:move_to_project_id, projects, include_blank: true,
-                     class: 'select2', data: { placeholder: 'Select project' })
        
       %span{ data: { toggle: 'tooltip', placement: 'auto top' }, style: 'cursor: default',
       title: 'Moving an issue will copy the discussion to a different project and close it here. All participants will be notified of the new location.' }

config/routes.rb

@@ -56,6 +56,7 @@ Rails.application.routes.draw do
   # Autocomplete
   get '/autocomplete/users' => 'autocomplete#users'
   get '/autocomplete/users/:id' => 'autocomplete#user'
+  get '/autocomplete/projects' => 'autocomplete#projects'
 
   # Emojis
   resources :emojis, only: :index

spec/features/issues/move_spec.rb

@@ -19,7 +19,7 @@ feature 'issue move to another project' do
     end
 
     scenario 'moving issue to another project not allowed' do
-      expect(page).to have_no_select('move_to_project_id')
+      expect(page).to have_no_selector('#move_to_project_id')
     end
   end
 
@@ -37,7 +37,7 @@ feature 'issue move to another project' do
     end
 
     scenario 'moving issue to another project' do
-      select(new_project.name_with_namespace, from: 'move_to_project_id')
+      first('#move_to_project_id', visible: false).set(new_project.id)
       click_button('Save changes')
 
       expect(current_url).to include project_path(new_project)
@@ -47,14 +47,18 @@ feature 'issue move to another project' do
       expect(page).to have_content(issue.title)
     end
 
-    context 'projects user does not have permission to move issue to exist' do
+    context 'user does not have permission to move the issue to a project', js: true do
       let!(:private_project) { create(:project, :private) }
       let(:another_project) { create(:project) }
       background { another_project.team << [user, :guest] }
 
       scenario 'browsing projects in projects select' do
-        options = [ '', 'No project', new_project.name_with_namespace ]
+        click_link 'Select project'
-        expect(page).to have_select('move_to_project_id', options: options)
+
+        page.within '.select2-results' do
+          expect(page).to have_content 'No project'
+          expect(page).to have_content new_project.name_with_namespace
+        end
       end
     end
 
@@ -65,7 +69,7 @@ feature 'issue move to another project' do
       end
 
       scenario 'user wants to move issue that has already been moved' do
-        expect(page).to have_no_select('move_to_project_id')
+        expect(page).to have_no_selector('#move_to_project_id')
       end
     end
   end