Question

我正在使用以下模型架构：

var AppointmentSchema = new Schema({
    appointment_date: {type: Date},
    created: {
        type: Date,
        default: Date.now
    },
    updated: {type: Date},
    client: [{ type: Schema.Types.ObjectId, ref: 'User' }], 
    staff_id: [{ type: Schema.Types.ObjectId, ref: 'User' }], 
    cost:{
        type: Number
    }, 
    jobDone:{
        type: Boolean, 
        default: false
    },  
    cancelled:{
        type: Boolean, 
        default: false
    }
});

其中明确引用了用户模型。

当我查询时，我想填充客户端和员工数据，但没有他们在该模型中保存的某些字段。

因此，如果用户模型是：

var UserSchema = new Schema({
    firstName: {
        type: String,
        trim: true,
        default: '',
        validate: [validateLocalStrategyProperty, 'Please fill in your first name']
    },
    lastName: {
        type: String,
        trim: true,
        default: '',
        validate: [validateLocalStrategyProperty, 'Please fill in your last name']
    },
    displayName: {
        type: String,
        trim: true
    }
});

我只想填充firstName和email（并省略其余的）可能吗？

Answer 1

要返回为 populated 文档返回的一些特定字段，您需要将通常的field name syntax作为第二个参数传递给populate方法：

Appointment 
.findOne({ cancelled: true })
.populate('client', 'firstName displayName') // only return the User's firstName and displayName
.exec(function (err, appointment) {
    if (err) return handleError(err);

    console.log('The client name is %s', appointment.client.firstName);
    // prints "The client name is Aaron"

    console.log('The client display name is %s', appointment.client.displayName);
    // prints "The client display name is aarontest'
})

是否可以仅填充某些字段MongoDB

1 个答案: