Mongoid/Mongodb和查询嵌入式文档 [英] Mongoid / Mongodb and querying embedded documents

问题描述

我有Author和Book模型.

Author具有许多嵌入式Books.

我可以查询嵌入式Books，还是必须先获取Authors才能获取Books?

Can I query the embedded Books, or do I have to fetch Authors first to get Books?

推荐答案

您可以查询嵌入式文档，只需限定名称即可.现在，这将返回所有拥有与您的查询匹配的书籍的作者.

You can query embedded documents, just qualify the name. Now, this will return all Authors that have books that match your query.

如果Author被定义为具有许多:books(并且book是嵌入的::文档)

If Author is defined as having many :books (and book is an embedded::document)

@authors_with_sewid = Author.where("books.name" => "sewid").all

然后，您需要遍历作者并提取书籍.

You'd then need to iterate over the authors and extract the books.

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