ruby 将回形针附件从一个模型复制到另一个模型? [英] ruby copy a paperclip attachment from one model to another?

问题描述

我有两个这样的模型:-

I have two models like this:-

模型 1 - 卡片 - 包含对首页感兴趣的数据的表示
附件名称 = cardimage
模型 2 - 用户 - 包含用户
附件名称=头像

Model 1 - card - contains a representation of data of interest for front page
attachment name = cardimage
Model 2 - user - contains the user
attachment name = avatar

当我创建时！一张新卡片，我希望将用户模型中的头像作为新卡片图像复制到卡片模型中.

When I create! a new card, I want the avatar from the user model to be copied to the card model as a new cardimage.

是否有一个简单的单衬?

Is there a simple one liner for this?

Ruby/Rails/Paperclip

Ruby/Rails/Paperclip

推荐答案

这应该可以解决问题，如果模型关联，您可以使用 after_create 回调，否则我建议在创建卡片的控制器动作.

This should do the trick, you could use an after_create callback if the models are associated, if not I would recommend doing it in the controller action that creates the card.

instance_of_model_one.cardimage = instance_of_model_two.avatar
instance_of_model_one.save

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