Extending Mailboxer through Concerns

concerns-messagable_with_data.rb

module Concerns
  module MessagableWithData

    extend ActiveSupport::Concern

    included do

      Message.class_eval do
        has_many :message_data,
          class_name: MessageData,
          extend: Concerns::MessagableWithData::MessageDataAssociationMethods
      end
      
    end

    module MessageDataAssociationMethods

      # When working with the message_data association method,
      # calling message_data#attatched will return all of the objects
      # referenced by each MessageData instance
      #
      # @return [Array<Object>] an array of objects
      def attatched
        self.collect(&:data)
      end

    end

    module InstanceMethods
      # Send a message with a data attatchment.
      #
      # @param [Hash] opts An options hash used to configure and send a message
      # @option [User, Array<User>] :to Users to send a message to
      # @option [String] :subject An optional subject for this message (nil)
      # @option [#serializable_hash] :data A serializable object to be associated with the outgoing message
      # @option [File] :attatchment An optional attatchment to include with this message (nil)
      # @option [Boolean] :sanitize Weather or not to sanetize input (true)
      #
      # @return [Receipt] a Receipt
      def send_message_with_data(opts = {})
        data    = opts.delete(:data)
        receipt = send_message(opts)

        unless receipt.errors.any?
          message_data = MessageData.create(user: self, message: receipt.message, data_type: data.class.name, data_id: data.id)
        end

        receipt
      end

    end

  end
end

concerns-messagable_without_subject.rb

module Concerns
  module MessagableWithoutSubject

    extend ActiveSupport::Concern

    module InstanceMethods

      # Override's Mailboxer's #send_message such that subjects are not required.
      # @see https://github.com/ging/mailboxer/blob/56987403939d6077ddb72bc708df90ab6e672ab6/lib/mailboxer/models/messageable.rb#L48-57
      # @param [Hash] opts An options hash used to configure and send a message
      # @option [User, Array<User>] :to Users to send a message to
      # @option [String] :subject An optional subject for this message (nil)
      # @option [File] :attatchment An optional attatchment to include with this message (nil)
      # @option [Boolean] :sanitize Weather or not to sanetize input (true)
      def send_message(opts = {})
        recipients = opts.delete(:to)
        subject    = opts.delete(:subject)
        body       = opts.delete(:body)
        attachment = opts.delete(:attatchment)
        sanitize   = opts.delete(:sanitize) ? true : false

        if subject.blank?
          subject = "Message from #{self.send(Mailboxer.name_method.to_sym)}"
        end

        convo = Conversation.new(subject: subject)
   
        message = self.messages.new(body: body, subject: subject, attachment: attachment)
        message.conversation = convo
        message.recipients = recipients.is_a?(Array) ? recipients : [recipients]
        message.recipients = message.recipients.uniq

        message.deliver(false, sanitize)
      end

    end

  end
end

user.rb

class User
  acts_as_messagable
  include Concerns::MessagableWithoutSubject
  include Concerns::MessagableWithData

  has_one :profile
end

This is a perfect example of what I was looking for. Thanks!
Where did you end up storing these? 'app/concerns'?

I found this from the data attachments issue #66 you raised in the mailboxer repo. Too bad it's not part of the gem but this is great. Exactly what I was looking for. Thanks!