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module ActionMailer
# Provides the option to parameterize mailers in other to share ivar setup, processing, and common headers.
#
# Consider this example that does not use parameterization:
#
# class InvitationsMailer < ApplicationMailer
# def account_invitation(inviter, invitee)
# @account = inviter.account
# @inviter = inviter
# @invitee = invitee
#
# subject = "#{@inviter.name} invited you to their Basecamp (#{@account.name})"
#
# mail \
# subject: subject,
# to: invitee.email_address,
# from: common_address(inviter),
# reply_to: inviter.email_address_with_name
# end
#
# def project_invitation(project, inviter, invitee)
# @account = inviter.account
# @project = project
# @inviter = inviter
# @invitee = invitee
# @summarizer = ProjectInvitationSummarizer.new(@project.bucket)
#
# subject = "#{@inviter.name.familiar} added you to a project in Basecamp (#{@account.name})"
#
# mail \
# subject: subject,
# to: invitee.email_address,
# from: common_address(inviter),
# reply_to: inviter.email_address_with_name
# end
#
# def bulk_project_invitation(projects, inviter, invitee)
# @account = inviter.account
# @projects = projects.sort_by(&:name)
# @inviter = inviter
# @invitee = invitee
#
# subject = "#{@inviter.name.familiar} added you to some new stuff in Basecamp (#{@account.name})"
#
# mail \
# subject: subject,
# to: invitee.email_address,
# from: common_address(inviter),
# reply_to: inviter.email_address_with_name
# end
# end
#
# InvitationsMailer.account_invitation(person_a, person_b).deliver_later
#
# Using parameterized mailers, this can be rewritten as:
#
# class InvitationsMailer < ApplicationMailer
# before_action { @inviter, @invitee = params[:inviter], params[:invitee] }
# before_action { @account = params[:inviter].account }
#
# default to: -> { @invitee.email_address },
# from: -> { common_address(@inviter) },
# reply_to: -> { @inviter.email_address_with_name }
#
# def account_invitation
# mail subject: "#{@inviter.name} invited you to their Basecamp (#{@account.name})"
# end
#
# def project_invitation
# @project = params[:project]
# @summarizer = ProjectInvitationSummarizer.new(@project.bucket)
#
# mail subject: "#{@inviter.name.familiar} added you to a project in Basecamp (#{@account.name})"
# end
#
# def bulk_project_invitation
# @projects = params[:projects].sort_by(&:name)
#
# mail subject: "#{@inviter.name.familiar} added you to some new stuff in Basecamp (#{@account.name})"
# end
# end
#
# InvitationsMailer.with(inviter: person_a, invitee: person_b).account_invitation.deliver_later
#
# That's a big improvement! It's also fully backwards compatible. So you can start to gradually transition
# mailers that stand to benefit the most from parameterization one by one and leave the others behind.
module Parameterized
extend ActiveSupport::Concern
included do
attr_accessor :params
end
class_methods do
def with(params)
ActionMailer::Parameterized::Mailer.new(self, params)
end
end
class Mailer
def initialize(mailer, params)
@mailer, @params = mailer, params
end
def method_missing(method_name, *args)
if @mailer.action_methods.include?(method_name.to_s)
ActionMailer::Parameterized::MessageDelivery.new(@mailer, method_name, *args).tap { |pmd| pmd.params = @params }
else
super
end
end
end
class MessageDelivery < ActionMailer::MessageDelivery
attr_accessor :params
private
def processed_mailer
@processed_mailer ||= @mailer_class.new.tap do |mailer|
mailer.params = params
mailer.process @action, *@args
end
end
def enqueue_delivery(delivery_method, options = {})
if processed?
super
else
args = @mailer_class.name, @action.to_s, delivery_method.to_s, @params, *@args
ActionMailer::Parameterized::DeliveryJob.set(options).perform_later(*args)
end
end
end
class DeliveryJob < ActionMailer::DeliveryJob # :nodoc:
def perform(mailer, mail_method, delivery_method, params, *args) #:nodoc:
mailer.constantize.with(params).public_send(mail_method, *args).send(delivery_method)
end
end
end
end
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