Make new merge request URL more friendly when pushing code

app/controllers/projects/merge_requests/creations_controller.rb

@@ -89,6 +89,8 @@ class Projects::MergeRequests::CreationsController < Projects::MergeRequests::Ap
 
   def build_merge_request
     params[:merge_request] ||= ActionController::Parameters.new(source_project: @project)
+    params[:merge_request][:source_branch] ||= params[:merge_request_source_branch].presence
+
     @merge_request = ::MergeRequests::BuildService.new(project, current_user, merge_request_params.merge(diff_options: diff_options)).execute
   end
 

app/services/merge_requests/get_urls_service.rb

@@ -50,8 +50,8 @@ module MergeRequests
     end
 
     def url_for_new_merge_request(branch_name)
-      merge_request_params = { source_branch: branch_name }
-      url = Gitlab::Routing.url_helpers.project_new_merge_request_url(project, merge_request: merge_request_params)
+      url = Gitlab::Routing.url_helpers.project_new_merge_request_url(project, branch_name)
+
       { branch_name: branch_name, url: url, new_merge_request: true }
     end
 

changelogs/unreleased/blackst0ne-update-push-new-merge-request-url.yml

+---
+title: Make new merge request URL more friendly when pushing code
+merge_request: 22526
+author: "@blackst0ne"
+type: changed

config/routes/project.rb

@@ -150,8 +150,6 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         post '', action: :create, as: nil
 
         scope path: 'new', as: :new_merge_request do
-          get '', action: :new
-
           scope constraints: { format: nil }, action: :new do
             get :diffs, defaults: { tab: 'diffs' }
             get :pipelines, defaults: { tab: 'pipelines' }
@@ -165,6 +163,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
           get :diff_for_path
           get :branch_from
           get :branch_to
+          get '(:merge_request_source_branch)', action: :new
         end
       end
 

spec/requests/api/internal_spec.rb

@@ -665,7 +665,7 @@ describe API::Internal do
 
       expect(json_response).to match [{
         "branch_name" => "new_branch",
-        "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new?merge_request%5Bsource_branch%5D=new_branch",
+        "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new/new_branch",
         "new_merge_request" => true
       }]
     end
@@ -686,7 +686,7 @@ describe API::Internal do
 
         expect(json_response).to match [{
           "branch_name" => "new_branch",
-          "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new?merge_request%5Bsource_branch%5D=new_branch",
+          "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new/new_branch",
           "new_merge_request" => true
         }]
       end
@@ -819,7 +819,7 @@ describe API::Internal do
 
       expect(json_response['merge_request_urls']).to match [{
         "branch_name" => "new_branch",
-        "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new?merge_request%5Bsource_branch%5D=new_branch",
+        "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new/new_branch",
         "new_merge_request" => true
       }]
     end

spec/services/merge_requests/get_urls_service_spec.rb

@@ -6,7 +6,7 @@ describe MergeRequests::GetUrlsService do
   let(:project) { create(:project, :public, :repository) }
   let(:service) { described_class.new(project) }
   let(:source_branch) { "merge-test" }
-  let(:new_merge_request_url) { "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new?merge_request%5Bsource_branch%5D=#{source_branch}" }
+  let(:new_merge_request_url) { "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new/#{source_branch}" }
   let(:show_merge_request_url) { "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/#{merge_request.iid}" }
   let(:new_branch_changes) { "#{Gitlab::Git::BLANK_SHA} 570e7b2abdd848b95f2f578043fc23bd6f6fd24d refs/heads/#{source_branch}" }
   let(:deleted_branch_changes) { "d14d6c0abdd253381df51a723d58691b2ee1ab08 #{Gitlab::Git::BLANK_SHA} refs/heads/#{source_branch}" }
@@ -117,7 +117,7 @@ describe MergeRequests::GetUrlsService do
       let(:new_branch_changes) { "#{Gitlab::Git::BLANK_SHA} 570e7b2abdd848b95f2f578043fc23bd6f6fd24d refs/heads/new_branch" }
       let(:existing_branch_changes) { "d14d6c0abdd253381df51a723d58691b2ee1ab08 570e7b2abdd848b95f2f578043fc23bd6f6fd24d refs/heads/markdown" }
       let(:changes) { "#{new_branch_changes}\n#{existing_branch_changes}" }
-      let(:new_merge_request_url) { "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new?merge_request%5Bsource_branch%5D=new_branch" }
+      let(:new_merge_request_url) { "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new/new_branch" }
 
       it 'returns 2 urls for both creating new and showing merge request' do
         result = service.execute(changes)