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Diffstat (limited to 'actionmailer/lib/action_mailer/parameterized.rb')
| -rw-r--r-- | actionmailer/lib/action_mailer/parameterized.rb | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/parameterized.rb b/actionmailer/lib/action_mailer/parameterized.rb new file mode 100644 index 0000000000..0fe417affe --- /dev/null +++ b/actionmailer/lib/action_mailer/parameterized.rb @@ -0,0 +1,155 @@ +# frozen_string_literal: true + +module ActionMailer + # Provides the option to parameterize mailers in order to share instance variable + # 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 + module Parameterized + extend ActiveSupport::Concern + + included do + attr_accessor :params + end + + module ClassMethods + # Provide the parameters to the mailer in order to use them in the instance methods and callbacks. + # + # InvitationsMailer.with(inviter: person_a, invitee: person_b).account_invitation.deliver_later + # + # See Parameterized documentation for full example. + def with(params) + ActionMailer::Parameterized::Mailer.new(self, params) + end + end + + class Mailer # :nodoc: + def initialize(mailer, params) + @mailer, @params = mailer, params + end + + private + def method_missing(method_name, *args) + if @mailer.action_methods.include?(method_name.to_s) + ActionMailer::Parameterized::MessageDelivery.new(@mailer, method_name, @params, *args) + else + super + end + end + + def respond_to_missing?(method, include_all = false) + @mailer.respond_to?(method, include_all) + end + end + + class MessageDelivery < ActionMailer::MessageDelivery # :nodoc: + def initialize(mailer_class, action, params, *args) + super(mailer_class, action, *args) + @params = params + end + + 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 + job = @mailer_class.parameterized_delivery_job + job.set(options).perform_later(*args) + end + end + end + + class DeliveryJob < ActionMailer::DeliveryJob # :nodoc: + def perform(mailer, mail_method, delivery_method, params, *args) + mailer.constantize.with(params).public_send(mail_method, *args).send(delivery_method) + end + end + end +end |