how to use different layout for different pages in ruby on rails?

Question

i know application.html.erb is the default for every page .i want to use a different layout when user login .i mean the dashboard after login should be of different layout rather than the default one(application.html.erb).

Answer 1

Create new layout eg app/views/layouts/dunno.html.erb. Use in controller

class DashboardController < ApplicationController
  layout 'dunno'
end

or per action

class DashboardController < ApplicationController
  def index
    render layout: 'dunno'
  end
end

see docs for details

Answer 2

You can do this in application controller, add this code, I am assuming that you are using devise

layout :layout_by_resource

def layout_by_resource
  user_signed_in? ? "my_custom_layout" : "application"
end