[英]Populate() ref nested in object array
I am trying to populate() all the subscriptions in my User model with data from the Show model. 我试图用Show模型中的数据填充()User模型中的所有订阅。 I have tried .populate('subscriptions.show') but it does nothing to the results.
我已经尝试过.populate('subscriptions.show'),但它对结果没有任何作用。
If I make subscriptions a plain array of Refs like so 如果我像这样进行订阅,就会得到一系列简单的Ref
subscriptions: [{type: Schema.Types.ObjectId, ref: 'Show'}]
doing a populate('subscriptions') works as intended 做一个populate('subscriptions')按预期工作
I have looked at every similar question I could find on Stackoverflow and what I could find on the docs. 我看过我在Stackoverflow上可以找到的每个类似问题以及在文档中可以找到的东西。 I can't see what I am doing wrong.
我看不到我在做什么错。
complete test file source that i am working with https://gist.github.com/anonymous/b7b6d6752aabdd1f9b59 我正在使用的完整测试文件源https://gist.github.com/anonymous/b7b6d6752aabdd1f9b59
Schema and Models 模式和模型
var userSchema = new Schema({
email: String,
displayName: String,
subscriptions: [{
show: {type: Schema.Types.ObjectId, ref: 'Show'},
favorite: {type: Boolean, default: false}
}]
});
var showSchema = new Schema({
title: String,
overview: String,
subscribers: [{type: Schema.Types.ObjectId, ref: 'User'}],
episodes: [{
title: String,
firstAired: Date
}]
});
var User = mongoose.model('User', userSchema);
var Show = mongoose.model('Show', showSchema);
Initial Data 初始数据
var user = new User({
email: "test@test.com",
displayName: "bill"
});
user.save(function(err, user) {
var show = new Show({
title: "Some Show",
overview: "A show about some stuff."
});
show.save();
user.subscriptions.push(show);
user.save();
});
The Query 查询
User.findOne({
displayName: 'bill'
})
.populate('subscriptions.show')
.exec(function(err, user) {
if (err) {
console.log(err);
}
console.log(user);
});
results in: 结果是:
{
_id: 53a7a39d878a965c4de0b7f2,
email: 'test@test.com',
displayName: 'bill',
__v: 1,
subscriptions: [{
_id: 53a7a39d878a965c4de0b7f3,
favorite: false
}]
}
Some code perhaps, also some corrections to your approach. 也许有一些代码,对您的方法也有一些更正。 You kind of want a "manyToMany" type of join which you can make as follows:
您有点想要“ manyToMany”类型的联接,您可以如下进行:
var async = require("async"),
mongoose = require("mongoose"),
Schema = mongoose.Schema;
mongoose.connect('mongodb://localhost/user');
var userSchema = new Schema({
email: String,
displayName: String,
subscriptions: [{ type: Schema.Types.ObjectId, ref: 'UserShow' }]
});
userShows = new Schema({
show: { type: Schema.Types.ObjectId, Ref: 'Show' },
favorite: { type: Boolean, default: false }
});
var showSchema = new Schema({
title: String,
overview: String,
subscribers: [{ type: Schema.Types.ObjectId, ref: 'User' }],
episodes: [{
title: String,
firstAired: Date
}]
});
var User = mongoose.model('User', userSchema);
var Show = mongoose.model('Show', showSchema);
var UserShow = mongoose.model('UserShow', userShows);
var user = new User({
email: 'test@test.com',
displayName: 'bill'
});
user.save(function(err,user) {
var show = new Show({
title: "Some Show",
overview: "A show about some stuff."
});
show.subscribers.push( user._id );
show.save(function(err,show) {
var userShow = new UserShow({ show: show._id });
user.subscriptions.push( userShow._id );
userShow.save(function(err,userShow) {
user.save(function(err,user) {
console.log( "done" );
User.findOne({ displayName: "bill" })
.populate("subscriptions").exec(function(err,user) {
async.forEach(user.subscriptions,function(subscription,callback) {
Show.populate(
subscription,
{ path: "show" },
function(err,output) {
if (err) throw err;
callback();
});
},function(err) {
console.log( JSON.stringify( user, undefined, 4) );
});
});
});
});
});
});
That should show a populated response much like this: 那应该显示一个填充的响应,就像这样:
{
"_id": "53a7b8e60462281231f2aa18",
"email": "test@test.com",
"displayName": "bill",
"__v": 1,
"subscriptions": [
{
"_id": "53a7b8e60462281231f2aa1a",
"show": {
"_id": "53a7b8e60462281231f2aa19",
"title": "Some Show",
"overview": "A show about some stuff.",
"__v": 0,
"episodes": [],
"subscribers": [
"53a7b8e60462281231f2aa18"
]
},
"__v": 0,
"favorite": false
}
]
}
Or without the "manyToMany" works also. 还是没有“ manyToMany”的作品也。 Note here that there is no initial call to populate:
请注意,这里没有要填充的初始调用:
var async = require("async"),
mongoose = require("mongoose"),
Schema = mongoose.Schema;
mongoose.connect('mongodb://localhost/user');
var userSchema = new Schema({
email: String,
displayName: String,
subscriptions: [{
show: {type: Schema.Types.ObjectId, ref: 'UserShow' },
favorite: { type: Boolean, default: false }
}]
});
var showSchema = new Schema({
title: String,
overview: String,
subscribers: [{ type: Schema.Types.ObjectId, ref: 'User' }],
episodes: [{
title: String,
firstAired: Date
}]
});
var User = mongoose.model('User', userSchema);
var Show = mongoose.model('Show', showSchema);
var user = new User({
email: 'test@test.com',
displayName: 'bill'
});
user.save(function(err,user) {
var show = new Show({
title: "Some Show",
overview: "A show about some stuff."
});
show.subscribers.push( user._id );
show.save(function(err,show) {
user.subscriptions.push({ show: show._id });
user.save(function(err,user) {
console.log( "done" );
User.findOne({ displayName: "bill" }).exec(function(err,user) {
async.forEach(user.subscriptions,function(subscription,callback) {
Show.populate(
subscription,
{ path: "show" },
function(err,output) {
if (err) throw err;
callback();
});
},function(err) {
console.log( JSON.stringify( user, undefined, 4) );
});
});
});
});
});
check answer: https://stackoverflow.com/a/28180427/3327857 检查答案: https : //stackoverflow.com/a/28180427/3327857
Car .find() .populate({
path: 'partIds',
model: 'Part',
populate: {
path: 'otherIds',
model: 'Other'
}
})
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