Question

 "user_crawls": {
     "0": {
       "_id": ObjectId("4e4b5e1c151c0d0336000093"),
       "rand_id": "kPxMuXOY8Jfh6nXt",
       "network": "tw",
       "sourcenetwork": "874777",
       "sourceName": "Krishna",
    },
     "1": {
       "_id": ObjectId("4e4b5e1c151c0d0336000094"),
       "rand_id": "kPxMuXOY8Jfh6nXt",
       "network": "fb",
       "sourcenetwork": "145875",
       "sourceName": "Krishna",
    },
  "2": {
       "_id": ObjectId("4e4b5e1c151c0d0336000095"),
       "rand_id": "kPxMuXOY8Jfh6nXt",
       "network": "fb",
       "sourcenetwork": "145875",
       "sourceName": "Ram",
    }

我想选择网络为fb且sourcename为Krishna的文档。从abouve数据通常我想得到结果是id为

的第二个doc

4e4b5e1c151c0d0336000094

但我得到了所有记录

我使用以下代码收集数据

DdNetworkCrawlLink.limit(10).all(:conditions => {'user_crawls.network' => "fb",'user_crawls.sourceName' => "Krishna")

感谢您的时间

Sreeraj

Answer 1

在Mongo中查询时，您只能查询根文档。所以它也在MongoMapper中。

要获得匹配的嵌入式文档，您必须先查询所有根文档，然后从中嵌入文档：

DdNetworkCrawlLink
.limit(10)
.all('user_crawls.network' => "fb",'user_crawls.sourceName' => "Krishna")
.map do |dbncl|
  dcncl.user_crawls.select { |uc| uc.network == "fb" && uc.sourceName == "Krishna" }
end.flatten

由于上述代码非常复杂，因此建议仅在嵌入式文档与其父级同时使用/显示/需要时才嵌入文档。

Answer 2

我想你错过了'：'char。在关于mongomapper的文档中，它说

Patient.all(:last_name => 'Johnson', :order => :last_name.asc)

Mongo mapper（Mongo DB）嵌入式文档多字段搜索

2 个答案: