change template_path for devise mailer instead of default devise mailer views

Question

When using Devise to create custom model User. The views are created via $ rails g devise:views users
How to tell Devise to use templates in views/users/mailer when sending confirmation emails to user??

Answer 1

step 1, uncomment the "config.mailer" line and rename Devise::Mailer to your own Mailer Class

# config/initializers/devise.rb

# Configure the class responsible to send e-mails.
# config.mailer = 'Devise::Mailer'
config.mailer = 'CustomMailer'

step 2, create a new file with CustomMailer class which inherits from Devise::Mailer. Then override method headers_for to set template_path to the folder with customized Devise views

# app/mailers/my_mailer.rb
class CustomMailer < Devise::Mailer
  def headers_for(action, opts)
    super.merge!({template_path: 'users/mailer'}) # app/views/users/mailer
  end
end