Correct the MR context commits endpoint

doc/api/merge_request_context_commits.md

@@ -27,15 +27,7 @@ Parameters:
         "authored_date": "2017-04-11T10:08:59.000Z",
         "committer_name": "Luke \"Jared\" Bennett",
         "committer_email": "lbennett@gitlab.com",
-        "committed_date": "2017-04-11T10:08:59.000Z",
-        "author": null,
-        "author_gravatar_url": "https://www.gravatar.com/avatar/2acf1fb99417a2b3971def5a294abbeb?s=80&d=identicon",
-        "commit_url": "http://127.0.0.1:3000/gitlab-org/gitlab-test/commit/4a24d82dbca5c11c61556f3b35ca472b7463187e",
-        "commit_path": "/gitlab-org/gitlab-test/commit/4a24d82dbca5c11c61556f3b35ca472b7463187e",
-        "description_html": "",
-        "title_html": "Update README.md to include `Usage in testing and development`",
-        "signature_html": null,
-        "pipeline_status_path": null
+        "committed_date": "2017-04-11T10:08:59.000Z"
     }
 ]
 ```

lib/api/entities.rb

@@ -759,12 +759,6 @@ module API
       end
     end
 
-    class MergeRequestContextCommit < Grape::Entity
-      expose :sha, :relative_order, :new_file, :renamed_file,
-        :deleted_file, :too_large, :a_mode, :b_mode, :new_path, :old_path,
-        :diff, :binary
-    end
-
     class SSHKey < Grape::Entity
       expose :id, :title, :key, :created_at
     end

lib/api/merge_requests.rb

@@ -293,7 +293,7 @@ module API
       end
 
       desc 'Get the context commits of a merge request' do
-        success Entities::CommitEntity
+        success Entities::Commit
       end
       get ':id/merge_requests/:merge_request_iid/context_commits' do
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
@@ -301,8 +301,10 @@ module API
 
         not_found! unless project.context_commits_enabled?
 
-        context_commits = merge_request.context_commits
-        CommitEntity.represent(context_commits, type: :full, request: merge_request)
+        context_commits =
+          paginate(merge_request.merge_request_context_commits).map(&:to_commit)
+
+        present context_commits, with: Entities::Commit
       end
 
       params do

spec/requests/api/merge_requests_spec.rb

@@ -1069,10 +1069,16 @@ describe API::MergeRequests do
 
   describe 'GET /projects/:id/merge_requests/:merge_request_iid/:context_commits' do
     it 'returns a 200 when merge request is valid' do
+      context_commit = merge_request.context_commits.first
+
       get api("/projects/#{project.id}/merge_requests/#{merge_request.iid}/context_commits", user)
+
       expect(response).to have_gitlab_http_status(200)
+      expect(response).to include_pagination_headers
       expect(json_response).to be_an Array
       expect(json_response.size).to eq(merge_request.context_commits.size)
+      expect(json_response.first['id']).to eq(context_commit.id)
+      expect(json_response.first['title']).to eq(context_commit.title)
     end
 
     it 'returns a 404 when merge_request_iid not found' do