how to create devise controller code example

Example 1: devise generate controller

$ rails generate devise:controllers users  # `/controllers/users/`

# routes.rb
devise_for :users, controllers: { registrations: 'users/registrations' }

Example 2: edit devise controllers

# in terminal
rails g devise:controllers users # generate all controllers

# routes.rb
devise_for :users, controllers: { registrations: 'users/registrations' }

#the registration will be done in the RegistrationsController