Fixed developers_can_push in RepoBranch API entity

app/models/concerns/protected_ref.rb

@@ -14,6 +14,12 @@ module ProtectedRef
       end
     end
 
+    def self.developers_can?(action, ref)
+      access_levels_for_ref(ref, action: action).any? do |access_level|
+        access_level.access_level == Gitlab::Access::DEVELOPER
+      end
+    end
+
     def self.access_levels_for_ref(ref, action: :push)
       self.matching(ref).map(&:"#{action}_access_levels").flatten
     end

lib/api/entities.rb

@@ -188,15 +188,11 @@ module API
       end
 
       expose :developers_can_push do |repo_branch, options|
-        project = options[:project]
-        access_levels = project.protected_branches.access_levels_for_ref(repo_branch.name, :push)
-        access_levels.any? { |access_level| access_level.access_level == Gitlab::Access::DEVELOPER }
+        options[:project].protected_branches.developers_can?(:push, repo_branch.name)
       end
 
       expose :developers_can_merge do |repo_branch, options|
-        project = options[:project]
-        access_levels = project.protected_branches.access_levels_for_ref(repo_branch.name, :merge)
-        access_levels.any? { |access_level| access_level.access_level == Gitlab::Access::DEVELOPER }
+        options[:project].protected_branches.developers_can?(:merge, repo_branch.name)
       end
     end