查询 Mongoid 哈希字段 [英] Query on Mongoid Hash Field

问题描述

我想查询 Mongoid 类的哈希字段.我不确定如何在有条件的情况下做到这一点?

I want to query on a Hash field for a Mongoid Class. I'm not sure how I can do this with conditions?

这是一个例子:

class Person
  include Mongoid::Document

  field :things, :type => Hash
end

所以，假设我有这个:

p = Person.new
p.things = {}
p.things[:tv] = "Samsung"

我想查询第一个拥有三星电视的人...

I want to query for the first person with a tv that is a Samsung...

People.first(:conditions => ?????

提前致谢.

推荐答案

Person.where('things.tv' => 'Samsung').first

这是 Mongoid 和 MongoDB 真正闪耀的地方.Mongoid 的 Criteria 方法(Person.where、Person.any_of、Person.excludes 等)将为您提供比 ActiveRecord 更大的灵活性-样式查找器(将 :conditions 哈希传递给 Person.find、Person.first 等)

This is where Mongoid and MongoDB really shine. Mongoid's Criteria methods (Person.where, Person.any_of, Person.excludes, etc.) will give you much more flexibility than the ActiveRecord-style finders (passing a :conditions hash to Person.find, Person.first, etc.)

Mongoid 的网站上有一些关于如何使用 Criteria 的精彩文档:

Mongoid's site has some great documentation on how to use Criteria:

http://mongoid.org/en/mongoid/docs/querying.html

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