Description:
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Stubs out a new mailer and its views. Passes the mailer name, either CamelCased or under_scored, and an optional list of emails as arguments. This generates a mailer class in app/mailers and invokes your template engine and test framework generators.
Example:
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rails generate mailer Notifications signup forgot_password invoice
creates a Notifications mailer class, views, and test:
Mailer: app/mailers/notifications_mailer.rb
Views: app/views/notifications_mailer/signup.text.erb [...]
Test: test/mailers/notifications_mailer_test.rb