javascript - 来自不同集合的子文档 ID 数组的 Mongoose 模式

Question

我有一个像这样的家庭模式(其 child 在学校就读)...

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

我想描述许多包含教室的学校，并且教室里有学生，就像这样......

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

如何告诉 mongoose 我想要在其他集合中找到的学生的对象 ID 数组？

我明白了from this answer如果我希望类里面引用家庭文件，我可以这样说:

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

但是我如何对另一个集合的子文档执行相同的操作？ (如果不明显，我只是在学习 mongo 和 mongoose)。

Answer 1

如果想使用子文档 reference ，您需要更改对 'student' 数组的引用。

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 );