How to load different templates and views if a user is logged in

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You might add a plug somewhere in your pipeline (router or endpoin.ex) which would assign a template or a whole view based on the user data.

It would be something like this

In the router (or endpoint):

def MyApp.Router do
  use Phoenix.Router

  pipeline :browser do # or any other pipeline
    # ...
    # the options [admin: ..., user: ...] I just picked as an example
    plug(MyApp.Plugs.Theme, [admin: "admin.html.eex", user: "app.html.eex"])
    # ...
  end
end

Then you can create a new folder under your /lib to put your custom plugs in (like /lib/plugs) and create a theme.ex plug there:

defmodule MyApp.Plugs.Theme do
  @moduledoc "Assings a theme to the connection based on current user."

  import Phoenix.Controller, only: [put_layout: 2]

  # just an example how to init options in plug
  def init(opts) do
    admin_theme = opts[:admin] 
    user_theme = opts[:user]
    {admin_theme, user_theme}
  end

  def call(%Plug.Conn{assigns: assigns} = conn, {admin_theme, user_theme}) do
    # :admin? would be replaced with your own assign that defines whether the 
    # current user is an admin
    # maybe you can use https://hexdocs.pm/coherence/Coherence.html#current_user/1 instead
    if assigns[:admin?] do 
      put_layout(conn, admin_theme)
    else
      put_layout(conn, user_theme)
    end
  end
end
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