Fix for incorrect routing to the Compare controller

config/routes.rb

@@ -166,12 +166,12 @@ Gitlab::Application.routes.draw do
       get "files"
     end
 
+    resources :blob,    only: [:show], constraints: {id: /.+/}
     resources :tree,    only: [:show, :edit, :update], constraints: {id: /.+/}
     resources :commit,  only: [:show], constraints: {id: /[[:alnum:]]{6,40}/}
     resources :commits, only: [:show], constraints: {id: /.+/}
     resources :compare, only: [:index, :create]
     resources :blame,   only: [:show], constraints: {id: /.+/}
-    resources :blob,    only: [:show], constraints: {id: /.+/}
     resources :graph,   only: [:show], constraints: {id: /.+/}
     match "/compare/:from...:to" => "compare#show", as: "compare",
                     :via => [:get, :post], constraints: {from: /.+/, to: /.+/}