Where do I put helper methods for ActionMailer views?

Question

I have a method that takes an array of strings and joins them so they do something like this:

>> my_arr
=> [\"A\", \"B\", \"C\"]
>> and_join(m         


        

Answer 1

In my case, for Rails 5.1, I had to use both include and helper methods, like this:

include ApplicationHelper
helper :application

And then just proceed to use the method normally.

class MyMailer < ActionMailer::Base
  include ApplicationHelper
  helper :application

  def my_mailer_method
    my_helper_method_declared_in_application_helper
    ..
  end
end