查询将DBRef转换为嵌入式文档

Question

我有这样的集合：

{
    "_id" : ObjectId("59edc30b7d1e1f025f78aaac"),
    "_class" : "xyz",
    "name" : "Test Segment 7",
    "attributes" : [ 
        {
            "attributeName" : "Country",
            "includedAttributes" : [ 
                {
                    "$ref" : "attribute",
                    "$id" : ObjectId("59ddffe8d1f2e34eb9d32f36")
                }
            ]
        }
    ]
}

我想要一个查询将includedAttributes转换为它的等效属性对象。

Answer 1

以下是适合我的解决方案：

db.collection1.find({}).forEach(function(row){
        row.attributes.forEach(function(rAttribute){
          if(rAttribute.includedAttributes != undefined){

              var embededAttributeArray = [];
                rAttribute.includedAttributes.forEach(function(iAttr){
                    var embeddedAttribute = db.getCollection('attribute').find({"_id":iAttr.$id}).toArray()[0];
                    embededAttributeArray.push(embeddedAttribute);
                });
                if(embededAttributeArray != undefined){
                    rAttribute.includedAttributes.length = 0; 
                    for(var i=0;i<embededAttributeArray.length;i++) {
                        rAttribute.includedAttributes.push(embededAttributeArray[i])                                 
                    }
                  db.collection1.save(row);
               }
            };
        });
});