actionmailer/test/mailers/params_mailer.rb


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class ParamsMailer < ActionMailer::Base
  before_action { @inviter, @invitee = params[:inviter], params[:invitee] }

  default to: Proc.new { @invitee }, from: -> { @inviter }

  def invitation
    mail(subject: "Welcome to the project!") do |format|
      format.text { render plain: "So says #{@inviter}" }
    end
  end
end