通过以下方式在has_many上优雅地设置联接表属性： [英] Elegantly set join table attributes on has_many through: association

问题描述

在我的Rails 3.2应用程序中，用户可以创建文章收藏集 $ c>。 馆藏和文章由 has_many通过以下方式加入：collections_articles

In my Rails 3.2 app Users can create Collections of Articles. Collections and Articles are joined by a has_many through: collections_articles relationship.

我希望将 user_id 存储在 collections_articles 商品添加到 Collection 时，c>连接表。 （因此，该应用程序可以稍后显示谁将文章添加到集合中）。

I wish to store the user_id in the collections_articles join table when an Article is added to a Collection. (So the app can later show who added an article to a collection). Is there an elegant way to do this?

class CollectionsArticle
  collection_id
  article_id
  user_id

  belongs_to :collection
  belongs_to :article
  belongs_to :user

当用户将文章添加到集合中时，我只想使用铲子，所以：

When a user adds an article to a collection I'd just like to use the shovel, so:

  my_collection.articles << my_article

是否存在（优雅地）同时设置 user_id 到 current_user ？或者最好是在联接表本身中显式创建记录的最佳方法：

Is there anyway to (elegantly) simultaneously set user_id of the join table to current_user? Or is the best way just to explicitly create the record in the join table itself:

  CollectionsArticle.create(article: @article, collection: @collection, user: current_user)

谢谢！

推荐答案

模型层本身没有 current_user 的知识，因此您必须从控制器中将其传递

The model layer itself does not have knwoledge of the current_user, so you have to pass it in from the controller layer somehow.

我能想到的最优雅的解决方案是在< add_article 方法中创建 Collection 模型：

The most elegant solution I can come up with is to create an add_article-method in the Collection model:

def add_article(article, by_user)
  self.collection_articles.create(article: article, user: by_user)
end

。并从控制器中调用它

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