Transfer to commits_controller, add test, and update changelog

app/controllers/application_controller.rb

@@ -63,10 +63,6 @@ class ApplicationController < ActionController::Base
     render_503
   end
 
-  def redirect_commits_root
-    redirect_to controller: 'commits', action: 'show', id: @repository.root_ref
-  end
-
   def redirect_back_or_default(default: root_path, options: {})
     redirect_to request.referer.present? ? :back : default, options
   end

app/controllers/projects/commits_controller.rb

@@ -4,13 +4,17 @@ class Projects::CommitsController < Projects::ApplicationController
   include ExtractsPath
   include RendersCommits
 
-  before_action :whitelist_query_limiting
+  before_action :whitelist_query_limiting, except: :commits_root
   before_action :require_non_empty_project
-  before_action :assign_ref_vars
+  before_action :assign_ref_vars, except: :commits_root
   before_action :authorize_download_code!
-  before_action :set_commits
+  before_action :set_commits, except: :commits_root
   before_action :set_request_format, only: :show
 
+  def commits_root
+    redirect_to project_commits_path(@project, @project.default_branch)
+  end
+
   def show
     @merge_request = MergeRequestsFinder.new(current_user, project_id: @project.id).execute.opened
       .find_by(source_project: @project, source_branch: @ref, target_branch: @repository.root_ref)

changelogs/unreleased/31576-redirect-commits-to-root-if-no-ref.yml

 ---
 title: Redirect commits to root if no ref is provided (31576)
-merge_request: 
+merge_request: 20738
 author: Kia Mei Somabes
 type: added

config/routes/repository.rb

@@ -83,7 +83,7 @@ scope format: false do
     get '/raw/*id', to: 'raw#show', as: :raw
     get '/blame/*id', to: 'blame#show', as: :blame
 
-    get '/commits/', to: 'application#redirect_commits_root', as: :commits_root
+    get '/commits', to: 'commits#commits_root', as: :commits_root
     get '/commits/*id/signatures', to: 'commits#signatures', as: :signatures
     get '/commits/*id', to: 'commits#show', as: :commits
 

spec/controllers/projects/commits_controller_spec.rb

@@ -9,6 +9,20 @@ describe Projects::CommitsController do
     project.add_master(user)
   end
 
+  describe "GET commits_root" do
+    context "no ref is provided" do
+      before do
+        get(:commits_root,
+            namespace_id: project.namespace,
+            project_id: project)
+      end
+
+      it 'should redirect to the default branch of the project' do
+        expect(response).to redirect_to project_commits_path(project)
+      end
+    end
+  end
+
   describe "GET show" do
     render_views