[英]Mongoose find in array of referenced subdocuments
I am trying to find certain visits coming from an ip.The visits schema looks like this : 我正在尝试查找来自ip的某些访问。访问模式如下所示:
var VisitSchema = new Schema({
visitId: String,
ip: [{ type: Schema.Types.ObjectId, ref: 'VisitorIp' }]
});
mongoose.model('Visit', VisitSchema);
the ip schema looks like this : ip模式如下所示:
var VisitorIpSchema = new Schema({
ip: String,
country: String
});
mongoose.model('VisitorIp', VisitorIpSchema);
when i try to run the normal find for a specific ip : 当我尝试运行特定IP的正常查找时:
Visit.find({ip.ip:myIp}))
.populate('ip')
.exec(function(err, visits){
console.log(visits)
})
it returns an empty array. 它返回一个空数组。 All the recordings in the mongo database look and behave normally. mongo数据库中的所有记录外观和行为均正常。
Please help I have run out of ideas. 请帮助我用尽了所有想法。
One not-so-elegant approach that you can take is to query after populating, ie get all the visits, populate the visits' ip documents with a query filter and when the query executes you'll then need to manually filter out visit documents that don't have any IP docs that matched the populate criteria, something like: 您可以采用的一种不太优雅的方法是在填充后进行查询,即获取所有访问,使用查询过滤器填充访问的ip文档,然后在执行查询时需要手动过滤出没有任何符合填充条件的IP文档,例如:
Visit.find({})
.populate('ip', null, { "ip": myIp } )
.where('ip.ip').equals(myIp) /* where('ip.ip').in([myIp]) */
.exec(function(err, visits){
visits = visits.filter(function(doc){
return visits.ip.length;
})
// do stuff with visits
});
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