Ruby on rails 3 轨道3和x2B；MongoDB：如何进行嵌套查询？

我正在使用Ruby Mongo驱动程序

  @surname = coll2.find("name" => {"surname" => "testing"})

这不应该起作用吗？我没有结果

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我有

{“name”：{“姓氏”：“testing”}

你的代码应该工作得很好

> coll2.insert({"name" => {"surname" => "testing"})
# => BSON::ObjectId('4dcb2e53abad691f62000002')
> coll2.insert({"name" => {"surname" => "another"})
# => BSON::ObjectId('4dcb2e53abad691f62000003')
> coll2.find().count
# => 2
> coll2.find("name" => {"surname" => "testing"}).count
# => 1
> coll2.find("name" => {"surname" => "testing"}).first
# => {"_id"=>BSON::ObjectId('4dcb2e53abad691f62000002'), "name"=>{"surname"=>"testing"}} 

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你的代码应该工作得很好

> coll2.insert({"name" => {"surname" => "testing"})
# => BSON::ObjectId('4dcb2e53abad691f62000002')
> coll2.insert({"name" => {"surname" => "another"})
# => BSON::ObjectId('4dcb2e53abad691f62000003')
> coll2.find().count
# => 2
> coll2.find("name" => {"surname" => "testing"}).count
# => 1
> coll2.find("name" => {"surname" => "testing"}).first
# => {"_id"=>BSON::ObjectId('4dcb2e53abad691f62000002'), "name"=>{"surname"=>"testing"}} 

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我认为下面的方法也行

coll2.find("name.surname"=>"testing").first

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我认为下面的方法也行

coll2.find("name.surname"=>"testing").first

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对我来说，它只适用于花括号。就像这样：

col2.find({"name.surname": "testing"})

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对我来说，它只适用于花括号。就像这样：

col2.find({"name.surname": "testing"})