Is PRG a valid technique in Phoenix?

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I just want to add that when you don’t want the default urls generated by the resources/4 macro, you could always use directly get/4 and post/4 like below:

# Registration
  scope "/registration", DemoWeb do
    pipe_through :browser
    get "/", RegistrationController, :new
    post "/", RegistrationController, :create
  end

This way the url won’t change between empty new form and create_error form. In my case I just do that for SEO purpose (for example I don’t want the url in English). And if someone shared the url, clicking on it will always result on the GET new form.

If you still want to redirect on invalid submit, you could assign the invalid changeset to the conn passed to redirect/2. Then you could have two clauses for your new action, one for empty form and the other for invalid form:

 # invalid form
  def new(%{error_changeset: changeset} = conn, _params) do
    render(conn, "new.html", changeset: changeset)
  end

  # empty form 
  def new(conn, _params) do
    changeset = Context.change_resource()
    render(conn, "new.html", changeset: changeset)
  end
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