如何在meteors现有集合中使用objectid查询$ in

Question

我在流星中使用现有的Mongodb。我不知道如何使用$in

查询ObjectId()

Users = new Mongo.Collection('users', {idGeneration: 'MONGO'});

var ids = ['55549158f046be124e3fdee7',
'5539d937f046be0e2502aefc',
'55548e10f046bee14c3fdeed',
'55549938f046be99493fdef8' ];

Users.find({_id:{$in: ids}}).fetch(); //returns empty array

Answer 1

您可以先使用 map() 方法将数组ID转换为ObjectIds数组：

var Users = new Mongo.Collection('users', {idGeneration: 'MONGO'}),
    ids = [
        '55549158f046be124e3fdee7',
        '5539d937f046be0e2502aefc',
        '55548e10f046bee14c3fdeed',
        '55549938f046be99493fdef8' 
    ],
    mids = ids.map(function(id) { return new Mongo.ObjectID(id); });

Users.find({"_id":{"$in": mids}}).fetch();