mongoid，使用数组中的元素查询

Question

I have structure class like this:

#<Transaction _id: 54d46d6a6e6f626fbcc70000,  _keywords: ["1", "test1", "test2", "abc1", "projectmongo", "last2", "taka"]>

array keyword map with: [field1, field2,...] So I want to query to get all transaction have field1 == "1" Is this possible?

Answer 1

MongoDB "dot notation" . Don't expect there to be a "rails like" SQL ORM mapping equivalent when using functionality like arrays which are generally not supported for those storage engines:

Class.collection.find({ "_keywords.0" => "1" })

So the Moped syntax here is more raw to the MongoDB functionality.

That basically says "look at the first array element to see if it matches the value I ask for".