mongodb Mongoose - 在 ObjectId 数组上使用 Populate
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Mongoose - using Populate on an array of ObjectId
提问by Alex
I've got a schema that looks a bit like:
我有一个看起来有点像的架构：
var conversationSchema = new Schema({
created: { type: Date, default: Date.now },
updated: { type: Date, default: Date.now },
recipients: { type: [Schema.ObjectId], ref: 'User' },
messages: [ conversationMessageSchema ]
});
So my recipients collection, is a collection of object id's referencing my user schema / collection.
所以我的收件人集合是引用我的用户架构/集合的对象 ID 的集合。
I need to populate these on query, so i'm trying this:
我需要在查询时填充这些，所以我正在尝试这个：
Conversation.findOne({ _id: myConversationId})
.populate('user')
.run(function(err, conversation){
//do stuff
});
But obviously 'user' isn't populating...
但显然“用户”并没有出现……
Is there a way I can do this?
有没有办法做到这一点？
回答by Duncan_m
For anyone else coming across this question.. the OP's code has an error in the schema definition.. it should be:
对于遇到此问题的任何其他人.. OP 的代码在架构定义中有错误.. 应该是：
var conversationSchema = new Schema({
created: { type: Date, default: Date.now },
updated: { type: Date, default: Date.now },
recipients: [{ type: Schema.ObjectId, ref: 'User' }],
messages: [ conversationMessageSchema ]
});
mongoose.model('Conversation', conversationSchema);
回答by aaronheckmann
Use the name of the schema path instead of the collection name:
使用架构路径的名称而不是集合名称：
Conversation.findOne({ _id: myConversationId})
.populate('recipients') // <==
.exec(function(err, conversation){
//do stuff
});
