如何将`:include` 添加到default_scope? [英] How to add `:include` to default_scope?

问题描述

搜索'net，我发现我应该使用:include，但这似乎并没有改变生成的SQL查询:

Searching the 'net, I found that I should use :include, but that does not seem to change the SQL query that is generated:

def Post #model
  default_scope :order => 'created_at DESC', :include => :author
end

有或没有 :include，SQL 是相同的(即它只是从帖子表中选择).

With or without the :include, the SQL is the same (i.e. it is only selecting from the posts table).

有什么方法可以做到这一点?

What is the way to do this?

推荐答案

如果你这样做了会怎样

default_scope { includes(:author).order('created_at ASC') }

这是在 Rails API 中为 记录的方式default_scope &scope,而不是您正在使用的哈希参数方法.

This is the way that it’s documented in the Rails API for default_scope & scope, rather than the hash parameter method you're using.

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