Use existing methods for branch names: Ex use @repository.branch_names instead of @repository.heads.map(&:name)

app/models/project.rb

@@ -369,12 +369,19 @@ class Project < ActiveRecord::Base
   end
 
   def open_branches
-    if protected_branches.empty?
-      self.repo.heads
-    else
-      pnames = protected_branches.map(&:name)
-      self.repo.heads.reject { |h| pnames.include?(h.name) }
-    end.sort_by(&:name)
+    all_branches = repository.branches
+
+    if protected_branches.present?
+      all_branches.reject! do |branch|
+        protected_branches_names.include?(branch.name)
+      end
+    end
+
+    all_branches
+  end
+
+  def protected_branches_names
+    @protected_branches_names ||= protected_branches.map(&:name)
   end
 
   def root_ref?(branch)
@@ -396,6 +403,6 @@ class Project < ActiveRecord::Base
 
   # Check if current branch name is marked as protected in the system
   def protected_branch? branch_name
-    protected_branches.map(&:name).include?(branch_name)
+    protected_branches_names.include?(branch_name)
   end
 end

app/models/repository.rb

@@ -63,8 +63,9 @@ class Repository
   end
 
   # Returns an Array of branch names
+  # sorted by name ASC
   def branch_names
-    repo.branches.collect(&:name).sort
+    branches.map(&:name)
   end
 
   # Returns an Array of Branches