remove all devise dependencies and add role model

Gemfile

Gemfile.lock

app/controllers/application_controller.rb

app/controllers/registrations_controller.rb

app/controllers/user/confirmations_controller.rb

app/controllers/user/omniauth_callbacks_controller.rb

app/controllers/user/passwords_controller.rb

app/controllers/user/registrations_controller.rb

app/controllers/user/sessions_controller.rb

app/controllers/user/unlocks_controller.rb

app/controllers/users_controller.rb

app/helpers/registrations_helper.rb

app/models/role.rb

app/models/user.rb

app/views/devise/confirmations/new.html.erb

app/views/devise/mailer/confirmation_instructions.html.erb

app/views/devise/mailer/reset_password_instructions.html.erb

app/views/devise/mailer/unlock_instructions.html.erb

app/views/devise/passwords/edit.html.erb

app/views/devise/passwords/new.html.erb