Rails' before_filter equivalent in Phoenix

Question

I\'ve just started working on my first Phoenix app, and the issue is that I have some common lines of code in every action in my controller, that I would like to separate ou

Answer 1

You can indeed achieve this with a Plug and Plug.Conn.assign.

defmodule TestApp.PageController do
  use TestApp.Web, :controller

  plug :store_something
  # This line is only needed in old phoenix, if your controller doesn't
  # have it already, don't add it.
  plug :action

  def index(conn, _params) do
    IO.inspect(conn.assigns[:something]) # => :some_data
    render conn, "index.html"
  end

  defp store_something(conn, _params) do
    assign(conn, :something, :some_data)
  end
end

Remember to add the plug declaration before your action plug, as they are executed in-order.