填充上的猫鼬条件的基础上，MongoDB的

Question

这里是我的代码来获得一个平面布置图和填充这个

链接的所有单位请参见下面的代码：

var floorplan = Floorplan.find({ 
    project: req.params.project, 
    tower: req.params.tower, 
    isDeleted: false 
}); 
floorplan.populate('flats').exec(function(err, floorplan) { 
    if (err) { return res.send(err); } 
    if (!floorplan) { return res.status(401).json(); } 
    res.status(200).json(floorplan); 
}); 

但我想只有那些填充flats where isDeleted：false 如何实现这个？

架构布图规划的

var FloorplanSchema = new Schema({ 
    project: { type: Schema.ObjectId, ref: "Project" }, 
    flats: [{ type: Schema.ObjectId, ref: "Flat" }], 
    tower: [{ type: Schema.ObjectId, ref: "Tower" }], 
    unitType: String, 
    area: Number, 
    floorPlan2D: String, 
    floorPlan3D: String, 
    livingRoomArea: Number, 
    kitchenArea: Number, 
    balconies: Number, 
    bathRooms: Number, 
    isDeleted: { type: Boolean, 'default': false }, 
    createdAt: { type: Date, 'default': Date.now } 
}); 

架构的扁平

var FlatSchema = new Schema({ 
    tower: { type: Schema.ObjectId, ref: "Tower" }, 
    floorplan: { type: Schema.ObjectId, ref: "Floorplan" }, 
    project: { type: Schema.ObjectId, ref: "Project" }, 
    status: String, 
    floor: Number, 
    size: String, 

    superbuiltup_area: Number, 

    directionFacing: String, 
    furnishingState: String, 
    flooringType: String, 
    createdAt: { type: Date, 'default': Date.now }, 
    isDeleted: { type: Boolean, 'default': false }, 

}); 

Answer 1

的populate()方法有一个选项，其允许过滤，则可以尝试这

Floorplan 
.find({ 
    project: req.params.project, 
    tower: req.params.tower, 
    isDeleted: false 
}) 
.populate({ 
    path: 'flats', 
    match: { isDeleted: false } 
}) 
.exec(function(err, floorplan) { 
    if (err) { return res.send(err); } 
    if (!floorplan) { return res.status(401).json(); } 
    res.status(200).json(floorplan); 
}); 

或

Floorplan 
.find({ 
    project: req.params.project, 
    tower: req.params.tower, 
    isDeleted: false 
}) 
.populate('flats', null, { isDeleted: false }) 
.exec(function(err, floorplan) { 
    if (err) { return res.send(err); } 
    if (!floorplan) { return res.status(401).json(); } 
    res.status(200).json(floorplan); 
});