Switchable the main branch on network graph

app/controllers/graph_controller.rb

@@ -0,0 +1,18 @@
+class GraphController < ProjectResourceController
+  include ExtractsPath
+
+  # Authorize
+  before_filter :authorize_read_project!
+  before_filter :authorize_code_access!
+  before_filter :require_non_empty_project
+
+  def show
+    respond_to do |format|
+      format.html
+      format.json do
+        graph = Gitlab::Graph::JsonBuilder.new(project, @ref)
+        render :json => graph.to_json
+      end
+    end
+  end
+end

app/controllers/projects_controller.rb

@@ -90,16 +90,6 @@ class ProjectsController < ProjectResourceController
     end
   end
 
-  def graph
-    respond_to do |format|
-      format.html
-      format.json do
-        graph = Gitlab::Graph::JsonBuilder.new(project)
-        render :json => graph.to_json
-      end
-    end
-  end
-
   def destroy
     return access_denied! unless can?(current_user, :remove_project, project)
 

app/controllers/refs_controller.rb

@@ -13,6 +13,8 @@ class RefsController < ProjectResourceController
       format.html do
         new_path = if params[:destination] == "tree"
                      project_tree_path(@project, (@ref + "/" + params[:path]))
+                   elsif params[:destination] == "graph"
+                     project_graph_path(@project, @ref)
                    else
                      project_commits_path(@project, @ref)
                    end