Implement approve button

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/projects/merge_requests_controller.rb

@@ -4,7 +4,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   before_action :module_enabled
   before_action :merge_request, only: [
     :edit, :update, :show, :diffs, :commits, :automerge, :automerge_check,
-    :ci_status, :toggle_subscription
+    :ci_status, :toggle_subscription, :approve
   ]
   before_action :closes_issues, only: [:edit, :update, :show, :diffs, :commits]
   before_action :validates_merge_request, only: [:show, :diffs, :commits]
@@ -195,6 +195,14 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     render nothing: true
   end
 
+  def approve
+    @approval = @merge_request.approvals.new
+    @approval.user = current_user
+    @approval.save
+
+    redirect_to merge_request_path(@merge_request)
+  end
+
   protected
 
   def selected_target_project

app/views/projects/merge_requests/show/_mr_accept.html.haml

@@ -17,6 +17,11 @@
 - if @show_merge_controls
   .automerge_widget.can_be_merged.hide
     .clearfix
+      - if @merge_request.requires_approve?
+        = form_for [:approve, @project.namespace.becomes(Namespace), @project, @merge_request], method: :post do |f|
+          %p This merge request must be approved by #{pluralize(@merge_request.approvals_left, 'user')} before it can be merged
+          = f.submit "Approve Merge Request", class: "btn btn-reopen"
+      - else
         = form_for [:automerge, @project.namespace.becomes(Namespace), @project, @merge_request], remote: true, method: :post do |f|
           .accept-merge-holder.clearfix.js-toggle-container
             .accept-action

config/routes.rb

@@ -491,6 +491,7 @@ Gitlab::Application.routes.draw do
             get :automerge_check
             get :ci_status
             post :toggle_subscription
+            post :approve
           end
 
           collection do

features/project/merge_requests.feature

@@ -220,3 +220,9 @@ Feature: Project Merge Requests
     When I click the "Target branch" dropdown
     And I select a new target branch
     Then I should see new target branch changes
+
+  Scenario: I approve merge request
+    Given merge request 'Bug NS-04' must be approved
+    Given I click link "Bug NS-04"
+    And I click link "Approve"
+    Then I should see approved merge request "Bug NS-04"

features/steps/project/merge_requests.rb

@@ -329,6 +329,21 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
     page.should have_content 'Target branch changed from master to feature'
   end
 
+  step 'merge request \'Bug NS-04\' must be approved' do
+    merge_request = MergeRequest.find_by!(title: "Bug NS-04")
+    project = merge_request.target_project
+    project.approvals_before_merge = 1
+    project.save!
+  end
+
+  step 'I click link "Approve"' do
+    click_button 'Approve Merge Request'
+  end
+
+  step 'I should see approved merge request "Bug NS-04"' do
+    page.should have_button("Accept Merge Request")
+  end
+
   def merge_request
     @merge_request ||= MergeRequest.find_by!(title: "Bug NS-05")
   end