如何查询猫鼬对象内的数组

Question

我正在尝试查找用户是否已申请助学金，并防止他们再次申请助学金。

用户架构：

const userSchema = new mongoose.Schema({
firstName: String,
lastName: String,
Username: String,
email: String,
isAdmin: {
    type: Boolean,
    default: false
}
});

应用架构：

const applicationSchema = new mongoose.Schema({
applicant:{
    id: {
        type: mongoose.Schema.Types.ObjectId,
        ref: "User"  
    },
    username: String
},
createdAt:{
    type: Date,
    default: Date.now
},
name: String,
age: Number,
status: {
    type: String,
    default: "Pending"
}
});

突发方案：

var bursarySchema = new mongoose.Schema({
name: String,
applications: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: "Application"
}],
period: String,
guidelines: String
});

是否可以通过此途径查询数据库，以了解用户是否已申请特定的助学金？