Mongoose.js：force始终填充

Question

有没有办法指示模型永远填充某个字段？

喜欢的东西，有 “场” 填充任何查找查询：

{field: Schema.ObjectId, ref: 'Ref', populate: true} 

？

Answer 1

随着猫鼬4.0，你可以以自动填充任何你想要使用查询挂钩。

以下示例来自Valeri Karpov的introduction document。架构的

定义：

var personSchema = new mongoose.Schema({ 
    name: String 
}); 

var bandSchema = new mongoose.Schema({ 
    name: String, 
    lead: { type: mongoose.Schema.Types.ObjectId, ref: 'person' } 
}); 

var Person = mongoose.model('person', personSchema, 'people'); 
var Band = mongoose.model('band', bandSchema, 'bands'); 

var axl = new Person({ name: 'Axl Rose' }); 
var gnr = new Band({ name: "Guns N' Roses", lead: axl._id }); 

查询钩来自动填充：

var autoPopulateLead = function(next) { 
    this.populate('lead'); 
    next(); 
}; 

bandSchema. 
    pre('findOne', autoPopulateLead). 
    pre('find', autoPopulateLead); 

var Band = mongoose.model('band', bandSchema, 'bands'); 

Answer 2

这个插件是你的问题的解决方案：

https://www.npmjs.com/package/mongoose-autopopulate