Rails包含范围 [英] Rails includes with scope

问题描述

我有一个称为Author的模型。作者有很多文章。
文章的作用域称为.published，它的作用是：where（published：true）。

I have a model called Author. An author has many Articles. Articles have a scope called .published that does: where(published: true).

我想用已发布的文章来加载作者。
我尝试过：

I want to load the author, with the published articles. I tried:

Author.includes(:articles.published).find(params[:author_id])

但这会引发错误：未定义的方法已发布。
有什么想法吗？

But that throws an error: undefined method 'published'. Any idea?

推荐答案

我认为最好的解决方案是：

I think the best solution would be:

Author.includes(:articles).where(:articles=>{published: true}).find(params[:author_id])

或者您可以创建范围：

class Author < ActiveRecord::Base 
    scope :with_published_articles, -> { includes(:articles).where(articles: { published: true}) }
end

然后：

Author.with_published_articles.find(params[:author_id].to_s)

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