添加与 Ruby Gem Mailboxer 的所属关系

我正在构建一个电子商务应用程序，并希望实现诸如消息传递系统之类的东西。在应用程序中，所有对话都将与Product模型或Order模型。在这种情况下，我想将相关对象（类型+ id，我想）存储到Conversation object.

要添加字段，我当然可以生成并运行迁移，但是，由于模型和控制器包含在 gem 中，我如何声明关系？ （belongs_to :linking_object, :polymorphic）和控制器？任何想法？

谢谢。

我最终定制了 Mailboxer gem 以允许conversationable要附加到对话的对象。

In models/mailboxer/conversation.rb

belongs_to :conversationable, polymorphic: true

添加迁移以使多态关联起作用：

add_column :mailboxer_conversations, :conversationable_id, :integer
add_column :mailboxer_conversations, :conversationable_type, :string

In lib/mailboxer/models/messageable.rb你添加conversationable_object到参数send_message:

def send_message(recipients, msg_body, subject, sanitize_text=true, attachment=nil, message_timestamp = Time.now, conversationable_object=nil)
  convo = Mailboxer::ConversationBuilder.new({
    :subject    => subject,
    :conversationable => conversationable_object,
    :created_at => message_timestamp,
    :updated_at => message_timestamp
  }).build

  message = Mailboxer::MessageBuilder.new({
    :sender       => self,
    :conversation => convo,
    :recipients   => recipients,
    :body         => msg_body,
    :subject      => subject,
    :attachment   => attachment,
    :created_at   => message_timestamp,
    :updated_at   => message_timestamp
  }).build

  message.deliver false, sanitize_text
end   

然后你就可以围绕对象进行对话：

class Pizza < ActiveRecord::Base
  has_many :conversations, as: :conversationable, class_name: "::Mailboxer::Conversation"    
  ...
end

class Photo < ActiveRecord::Base
  has_many :conversations, as: :conversationable, class_name: "::Mailboxer::Conversation"    
  ...
end

假设您有一些用户设置为互相发送消息

bob = User.find(1)
joe = User.find(2)
pizza = Pizza.create(:name => "Bacon and Garlic")

bob.send_message(joe, "My Favorite", "Let's eat this", true, nil, Time.now, pizza)

现在，在消息视图中，您可以引用该对象：

Pizza Name: <%= @message.conversation.conversationable.name %>