I’m not familiar with Guardian, but this is how I would do it if I controlled the whole login flow.

Add a redirect_after_authentication function:

def redirect_after_authentication(conn) do
  path =
    case conn.assigns.current_user.user_role do
      "admin" ->
         admin_dashboard_path(conn, :index)
      "accounts" ->
         accounts_dashboard_path(conn, :index)
      "sales" ->
        accounts_dashboard_path(conn, :index)
    end

  redirect(conn, to: path)
end

You can put that function in a shared module, wherever it makes sense for your application. Then, in your SessionController, where you log in users, you’d do this:

# import `redirect_after_authentication/1` from wherever you put it

def create(conn, params) do
  # Authentication logic, checking email/password etc
  redirect_after_authentication(conn)
end

Somewhere in your flow You should have

assign(socket, :user, user)

like just after

|> Guardian.Plug.sign_in(user)

and be sure to have a userole attribute in your schema.

The error message is somehow clear…

nil.userrole/0

It does not find the user in

conn.assigns.user