Fix Commits API to accept a Project path upon POST

changelogs/unreleased/26261-post-api-v3-projects-idorproject-commits-commits-does-not-work-with-project-path.yml

+---
+title: Fix Commits API to accept a Project path upon POST
+merge_request:
+author:

lib/api/commits.rb

@@ -44,7 +44,6 @@ module API
         detail 'This feature was introduced in GitLab 8.13'
       end
       params do
-        requires :id, type: Integer, desc: 'The project ID'
         requires :branch_name, type: String, desc: 'The name of branch'
         requires :commit_message, type: String, desc: 'Commit message'
         requires :actions, type: Array[Hash], desc: 'Actions to perform in commit'

spec/requests/api/commits_spec.rb

@@ -146,6 +146,16 @@ describe API::Commits, api: true  do
 
         expect(response).to have_http_status(400)
       end
+
+      context 'with project path in URL' do
+        let(:url) { "/projects/#{project.namespace.path}%2F#{project.path}/repository/commits" }
+
+        it 'a new file in project repo' do
+          post api(url, user), valid_c_params
+
+          expect(response).to have_http_status(201)
+        end
+      end
     end
 
     context :delete do