Rails 4 相当于 Rails 3 'Model.all' [英] Rails 4 equivalent of Rails 3 'Model.all'

问题描述

在 Rails 3 中，如果我想点击 db，我会在查询结束时使用 .all.这在我执行诸如在写入时刷新缓存之类的操作时很有用(因此读取总是命中缓存).

In Rails 3 if I wanted to hit the db I'd take .all on the end of a query. This is useful for when I'm doing things like refreshing cache on writes (so reads always hit cache).

现在在 Rails 4 中，Model.all 返回一个 ActiveRecord::Relation 对象(即不命中数据库).让它实际转到数据库并返回指定记录的最佳方法是什么?

Now in Rails 4, Model.all returns an ActiveRecord::Relation object (ie doesn't hit the db). What is the best way to get it actually go to the db and return the records specified?

推荐答案

Model.all.to_a 在 Rails 4 中将给出与 Rails 中的 Modal.all 相同的结果3.

Model.all.to_a in Rails 4 will give the same result as Modal.all in Rails 3.

修改:

@Bigxiang，在他的评论中指出尝试Model.all.load，这个方法肯定命中了数据库，但仍然返回一个ActiveRecordRelation.基本上要从Rails 3"中获得与 Model.all 类似的功能，您可以在返回的 ActiveRecordRelation 上调用 to_a.

@Bigxiang, pointed out in his comment to try Model.all.load, this method for certain hits the database but still returns an ActiveRecordRelation. And basically to get a similar functionality as Model.all from "Rails 3", you can call to_a on the returned ActiveRecordRelation.

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