Fix an issue with edits sending user back to @source_project

-Form was for @source_project rather then @Project.
-add spinach test for edit submission on forked project

Change-Id: I807a5077608b7e910f4bc83c5d3e82c378f70a9e

app/controllers/projects/merge_requests_controller.rb

@@ -54,10 +54,8 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   end
   def create
-    @merge_request = @project.merge_requests.new(params[:merge_request])
+    @merge_request = MergeRequest.new(params[:merge_request])
     @merge_request.author = current_user
-    @merge_request.source_project_id = params[:merge_request][:source_project_id].to_i
-    @merge_request.target_project_id = params[:merge_request][:target_project_id].to_i
     @target_branches ||= []
     if @merge_request.save
       @merge_request.reload_code

app/views/projects/merge_requests/_form.html.haml

-= form_for [@source_project, @merge_request], html: { class: "#{controller.action_name}-merge-request form-horizontal" } do |f|
+= form_for [@project, @merge_request], html: { class: "#{controller.action_name}-merge-request form-horizontal" } do |f|
   -if @merge_request.errors.any?
     .alert.alert-error
       %ul

features/project/forked_merge_requests.feature

@@ -37,6 +37,9 @@ Feature: Project Forked Merge Requests
     And I should see merge request "Merge Request On Forked Project"
     And I click link edit "Merge Request On Forked Project"
     Then I see the edit page prefilled for "Merge Request On Forked Project"
+    And I update the merge request title
+    And I save the merge request
+    Then I should see the edited merge request
   @javascript
   Scenario: I cannot submit an invalid merge request

features/steps/project/project_forked_merge_requests.rb

@@ -100,6 +100,28 @@ class ProjectForkedMergeRequests < Spinach::FeatureSteps
     verify_commit_link(".mr_source_commit",@forked_project)
   end
+  And 'I update the merge request title' do
+    fill_in "merge_request_title", with: "An Edited Forked Merge Request"
+  end
+
+  And 'I save the merge request' do
+    click_button "Save changes"
+  end
+
+  Then 'I should see the edited merge request' do
+    page.should have_content "An Edited Forked Merge Request"
+    @project.merge_requests.size.should >= 1
+    @merge_request = @project.merge_requests.last
+    current_path.should == project_merge_request_path(@project, @merge_request)
+    @merge_request.source_project.should == @forked_project
+    @merge_request.source_branch.should == "master"
+    @merge_request.target_branch.should == "stable"
+    page.should have_content @forked_project.path_with_namespace
+    page.should have_content @project.path_with_namespace
+    page.should have_content @merge_request.source_branch
+    page.should have_content @merge_request.target_branch
+  end
+
   Then 'I should see last push widget' do
     page.should have_content "You pushed to new_design"
     page.should have_link "Create Merge Request"