使用存储在数组中的_id从golang查询mongodb

问题描述：

So here is my question. I have an array which are stored the _ids of mongodbs objects. Whats the right way to retrieve them all in one query using the mgo and bson package?

So if the array is like that: ids:=["543d171c5b2c12420dd016","543d171c5b2dd016"]

How we make the query ? I tried that but I know its wrong.

query := bson.M{"_id": bson.M{"$in": ids}}
c.Find(query).All()

Thanks in advance

这是我的问题。我有一个存储mongodbs对象的_ids code>的数组。用mgo和bson包在一个查询中全部检索它们的正确方法是什么？ p>

因此，如果数组是这样的： ids：= [“ 543d171c5b2c12420dd016”，“ 543d171c5b2dd016 “] code> p>

我们如何进行查询？我尝试过，但是我知道它是错误的。 p>


  query：= bson.M {“ _ id”：bson.M {“ $ in”：ids}} 
c.Find  （查询）。All（）
  code>  pre> 
 
 谢谢 p> 
  div>

答

If the documents are stored with string ids, then the code looks correct.

The ids look like hex encoded object ids. If the object identifiers are object ids, then you need to the convert the hex strings to object ids:

oids := make([]bson.ObjectId, len(ids))
for i := range ids {
  oids[i] = bson.ObjectIdHex(ids[i])
}
query := bson.M{"_id": bson.M{"$in": oids}}

使用存储在数组中的_id从golang查询mongodb

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