[英]Virtual populate with Mongoose
我有以下 shema,如何從媒體填充文檔以進行教育、體驗和認證? 我嘗試了很多方法,但它不起作用。
const mongoose = require('mongoose');
exports.User = schema => {
schema.add({
username: {
type: String,
index: true
},
education: [
{
title: String,
description: String,
year: String,
verified: Boolean,
documentId: mongoose.Schema.Types.ObjectId
}
],
experience: [
{
title: String,
description: String,
year: String,
verified: Boolean,
documentId: mongoose.Schema.Types.ObjectId
}
],
certification: [
{
title: String,
description: String,
year: String,
verified: Boolean,
documentId: mongoose.Schema.Types.ObjectId
}
]
});
schema.set('toObject', { virtuals: true });
schema.set('toJSON', { virtuals: true });
};
檢查填充
const users = await User.find({}).populate('education').populate('experience').populate('certification')
您可以使用 path 屬性進行深度鏈接,這也適用於 Array 類型。
第 1 步:如下更改 documentId 字段的架構以定義對媒體集合的引用
documentId: { type: mongoose.ObjectId, ref: 'Media' },
第 2 步:在架構上定義虛擬屬性
schema.virtual('educationDocument', {
ref: 'Media', // the collection/model name
localField: 'education.documentId',
foreignField: '_id',
justOne: true, // default is false });
第 3 步:使用 mongoose填充深度鏈接的路徑定義
const users = await User.find({})
.populate({ path: 'educationDocument' })
.populate({ path: 'experienceDocument' })
.populate({ path: 'certificationDocument' })
.execPopulate()
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