Clean up Repository cache code.

app/models/repository.rb

@@ -105,29 +105,25 @@ class Repository
   end
 
   def add_branch(branch_name, ref)
-    cache.expire(:branch_names)
-    @branches = nil
+    expire_branches_cache
 
     gitlab_shell.add_branch(path_with_namespace, branch_name, ref)
   end
 
   def add_tag(tag_name, ref, message = nil)
-    cache.expire(:tag_names)
-    @tags = nil
+    expire_tags_cache
 
     gitlab_shell.add_tag(path_with_namespace, tag_name, ref, message)
   end
 
   def rm_branch(branch_name)
-    cache.expire(:branch_names)
-    @branches = nil
+    expire_branches_cache
 
     gitlab_shell.rm_branch(path_with_namespace, branch_name)
   end
 
   def rm_tag(tag_name)
-    cache.expire(:tag_names)
-    @tags = nil
+    expire_tags_cache
 
     gitlab_shell.rm_tag(path_with_namespace, tag_name)
   end
@@ -169,6 +165,16 @@ class Repository
     end
   end
 
+  def expire_tags_cache
+    cache.expire(:tag_names)
+    @tags = nil
+  end
+
+  def expire_branches_cache
+    cache.expire(:branch_names)
+    @branches = nil
+  end
+
   def expire_cache
     cache_keys.each do |key|
       cache.expire(key)