来自不同集合的子文档ID数组的猫鼬模式

Question

我有一个这样的家庭模式（孩子在学校读书）...

var familySchema = new Schema({
    parents: [{
        firstName: String,
        lastName: String,
        email: String,
    }],
    students: [{
        firstName: String,
        lastName: String,
        grade: Number,
    }]
});

我想描述许多有教室的学校，并且教室里有学生，像这样...

var schoolSchema = new Schema({
    name: String,
    street: String,
    classrooms: [{
        classroomNumber: Number,
        students: [ /* I am mixed up here */ ]
    }]
});

我如何告诉猫鼬，我想要其他集合中找到的学生的对象ID数组？

我从这个答案中了解到，如果我想让教室参考家庭文件，我可以这样说：

families: { type : ObjectId, ref: 'Family' }

但是如何对另一个集合的子文档执行相同的操作？ （如果不是很明显，我将同时学习mongo和mongoose）。

Answer 1

如果要使用子文档引用 ，则需要将引用更改为'student'数组。

var studentSchema = new Schema({
    firstName: String,
    lastName: String,
    grade: Number,
});

var familySchema = new Schema({
    parents: [{
        firstName: String,
        lastName: String,
        email: String,
    }],
    students: [studentSchema]
});

var schoolSchema = new Schema({
    name: String,
    street: String,
    classrooms: [{
        classroomNumber: Number,
        students: [ { type: ObjectId, ref: 'Family.students' }]
    }]
});

var Student = mongoose.model('Student', studentSchema );  
var Family = mongoose.model('Family ', familySchema ); 
var School = mongoose.model('School', schoolSchema );