如何根据多个条件查找嵌入的Mongoid文档? [英] How can I find embedded Mongoid documents based on multiple criteria?

问题描述

我有一个包含嵌入式文档的Mongoid文档.我想在所有包含顶级文档的嵌入式文档中搜索所有顶级文档.

I have a Mongoid document with embedded documents in it. I want to search the top-level documents for all of them where there is an embedded document that has multiple criteria.

TopDoc.where('inside.first_name' => 'Bob', 'inside.last_name' => 'Jones')

但是在我看来，这将与Bob Wever和Paul Jones在TopDoc上匹配，这是错误的.

But it seems to me this would match on a TopDoc with Bob Wever and Paul Jones, which is wrong.

推荐答案

您需要使用 $ elemMatch .对于Mongoid，以下几行应该可以解决问题

You need to use $elemMatch. With Mongoid, the following line should do the trick

TopDoc.elem_match(inside: { first_name: 'Bob', last_name: 'Jones' })

等效于:

TopDoc.where(:inside.elem_match => { first_name: 'Bob', last_name: 'Jones'})

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