Merge branch 'api-cleanup-entities' into 'master'

Simplify entities for branches and tags API

## What does this MR do?

As talked in !5208, I improved the entity for branches and tags.

## Does this MR meet the acceptance criteria?

~~- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added~~
~~- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
~~- [ ] API support added~~
~~- Tests~~
  ~~- [ ] Added for this feature/bug~~
  ~~- [ ] All builds are passing~~
~~- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)~~
~~- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)~~
~~- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)~~

See merge request !5343

lib/api/branches.rb

@@ -15,7 +15,8 @@ module API
       #   GET /projects/:id/repository/branches
       get ":id/repository/branches" do
         branches = user_project.repository.branches.sort_by(&:name)
-        present branches, with: Entities::RepoObject, project: user_project
+
+        present branches, with: Entities::RepoBranch, project: user_project
       end
 
       # Get a single branch
@@ -28,7 +29,8 @@ module API
       get ':id/repository/branches/:branch', requirements: { branch: /.+/ } do
         @branch = user_project.repository.branches.find { |item| item.name == params[:branch] }
         not_found!("Branch") unless @branch
-        present @branch, with: Entities::RepoObject, project: user_project
+
+        present @branch, with: Entities::RepoBranch, project: user_project
       end
 
       # Protect a single branch
@@ -60,7 +62,7 @@ module API
                                                  developers_can_merge: developers_can_merge || false)
         end
 
-        present @branch, with: Entities::RepoObject, project: user_project
+        present @branch, with: Entities::RepoBranch, project: user_project
       end
 
       # Unprotect a single branch
@@ -79,7 +81,7 @@ module API
         protected_branch = user_project.protected_branches.find_by(name: @branch.name)
         protected_branch.destroy if protected_branch
 
-        present @branch, with: Entities::RepoObject, project: user_project
+        present @branch, with: Entities::RepoBranch, project: user_project
       end
 
       # Create branch
@@ -97,7 +99,7 @@ module API
 
         if result[:status] == :success
           present result[:branch],
-                  with: Entities::RepoObject,
+                  with: Entities::RepoBranch,
                   project: user_project
         else
           render_api_error!(result[:message], 400)

lib/api/entities.rb

@@ -114,33 +114,23 @@ module API
       end
     end
 
-    class RepoObject < Grape::Entity
+    class RepoBranch < Grape::Entity
       expose :name
 
-      expose :commit do |repo_obj, options|
-        if repo_obj.respond_to?(:commit)
-          repo_obj.commit
-        elsif options[:project]
-          options[:project].repository.commit(repo_obj.target)
-        end
+      expose :commit do |repo_branch, options|
+        options[:project].repository.commit(repo_branch.target)
       end
 
-      expose :protected do |repo_obj, options|
-        if options[:project]
-          options[:project].protected_branch? repo_obj.name
-        end
+      expose :protected do |repo_branch, options|
+        options[:project].protected_branch? repo_branch.name
       end
 
-      expose :developers_can_push do |repo_obj, options|
-        if options[:project]
-          options[:project].developers_can_push_to_protected_branch? repo_obj.name
-        end
+      expose :developers_can_push do |repo_branch, options|
+        options[:project].developers_can_push_to_protected_branch? repo_branch.name
       end
 
-      expose :developers_can_merge do |repo_obj, options|
-        if options[:project]
-          options[:project].developers_can_merge_to_protected_branch? repo_obj.name
-        end
+      expose :developers_can_merge do |repo_branch, options|
+        options[:project].developers_can_merge_to_protected_branch? repo_branch.name
       end
     end
 
@@ -437,27 +427,14 @@ module API
     end
 
     class RepoTag < Grape::Entity
-      expose :name
-      expose :message do |repo_obj, _options|
-        if repo_obj.respond_to?(:message)
-          repo_obj.message
-        else
-          nil
-        end
-      end
+      expose :name, :message
 
-      expose :commit do |repo_obj, options|
-        if repo_obj.respond_to?(:commit)
-          repo_obj.commit
-        elsif options[:project]
-          options[:project].repository.commit(repo_obj.target)
-        end
+      expose :commit do |repo_tag, options|
+        options[:project].repository.commit(repo_tag.target)
       end
 
-      expose :release, using: Entities::Release do |repo_obj, options|
-        if options[:project]
-          options[:project].releases.find_by(tag: repo_obj.name)
-        end
+      expose :release, using: Entities::Release do |repo_tag, options|
+        options[:project].releases.find_by(tag: repo_tag.name)
       end
     end