Question

我在mongodb有100万份文件。我想找到并取消设置相同的字段。你能给我一个方法或想法吗？

我的文件是这样的：

{
        "regions" : [ 
            {"id" : "1", "name" : "World"}, 
            {"id" : "10370","name" : "South America"}, 
            {"id" : "1426","name" : "Suriname"}
        ]
    }
    {
        "regions" : [ 
            {"id" : "1", "name" : "World"}, 
            {"id" : "10370","name" : "South America"}, 
            {"id" : "1426","name" : "Suriname"}
        ]
    }
    {
        "regions" : [ 
            {"id" : "1","name" : "World"}, 
            {"id" : "1734","name" : "USA"}, 
            {"id" : "1136","name" : "Pennsylvania"}, 
            {"id" : "16962","name" : "Greater Philadelphia area"}, 
        ]
    }
    {
        "regions" : [ 
            {"id" : "1","name" : "World"}, 
            {"id" : "1734","name" : "USA"}, 
            {"id" : "1136","name" : "Pennsylvania"}, 
            {"id" : "16962","name" : "Greater Philadelphia area"}, 
        ]
    }
    {
    "regions" : [ 
        {"id" : "1","name" : "World"}, 
        {"id" : "34964","name" : "Oceania"}, 
        {"id" : "15","name" : "Australia"}, 
        {"id" : "470","name" : "Western Australia"}, 
        {"id" : "36282","name" : "Perth"}, 
      ]
   }

如何改变：

{
        "regions" : [ 
            {"id" : "1", "name" : "World"}, 
            {"id" : "10370","name" : "South America"}, 
            {"id" : "1426","name" : "Suriname"}
        ]
    }
    {
        "regions" : [ 
            {"id" : "1","name" : "World"}, 
            {"id" : "1734","name" : "USA"}, 
            {"id" : "1136","name" : "Pennsylvania"}, 
            {"id" : "16962","name" : "Greater Philadelphia area"}, 
        ]
    }
    {
"regions" : [ 
    {"id" : "1","name" : "World"}, 
    {"id" : "34964","name" : "Oceania"}, 
    {"id" : "15","name" : "Australia"}, 
    {"id" : "470","name" : "Western Australia"}, 
    {"id" : "36282","name" : "Perth"}, 
   ]
  }

感谢您的回答和提前的兴趣。

更新我正在尝试这段代码：

db.collection.aggregate(
 {"$group":{"_id": {"id": "$regions.id","name": "$regions.name"},}},
 {"$group":{"_id":ObjectId(),"regions": { "$push": {"id": "$_id.id","name": $_id.name"}}}},
 {"$unwind": "$regions"},
 {"$out": "newcollection"}
)

它给出了这个错误：＆＃34; ERRMSG＆＃34; ：＆＃34;插入$ out失败：{connectionId：111，错误：\＆＃34; E11000重复键错误集合：collection.tmp.agg_out.12索引： id dup key：{ ：ObjectId（＆＃39; 5767f378ff8f5e9302d95bc8＆＃39;）} \＆＃34;，代码：11000，n：0，ok：1.0}＆＃34;，

如何提供唯一密钥？

Answer 1

使用聚合，如果按数组元素分组，则可以删除重复区域。这样的事情会有所帮助吗？

db.regs.aggregate([{$group:{"_id":{id:"$regions.id",name:"$regions.name"}}}]).pretty()

如何在mongodb上查找和取消设置相同的子字段值

1 个答案: