Not working for collection actions

My routes are like this

``` Elixir
scope "/", PostPhoenix do
  pipe_through :api

  scope "v1" do
    resources "posts", PostController, only: [:index, :show]
    post "posts/search", PostController, :search
  end
end
```

member routes are working fine like

```
/v1/posts/3.json
```

But it doesn't work on collection actions. Like this

```
/v1/posts.json
```
