JSON包含条件 [英] JSON include with conditions

问题描述

我的设置:Rails 2.3.10，Ruby 1.8.7

My setup: Rails 2.3.10, Ruby 1.8.7

假设我有此代码段

user = User.find(1)
user.to_json(:include => :posts)

如果我想包括具有一定条件的用户帖子，例如仅一周之久的帖子，该怎么办?

What if I want to include the user's posts with a certain condition like posts that are only a week old?

推荐答案

在User模型中定义一个名为week_old_posts的新方法:

Define a new method called week_old_posts in the User model:

def week_old_posts
  posts.where("created_at > ?", 1.week.ago)
end

然后在您的to_json通话中使用methods而不是include:

Then in your to_json call use methods rather than include:

user.to_json(:methods => :week_old_posts)

:include如果要包括整个关联，则在要包括部分关联时使用方法.

:include is more useful if you want to include a whole association, use methods for when you want to include parts of associations.

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