findOneAndUpdate 不更新鉴别器

Question

我正在使用 Node、Express 和 Mongoose 开发 REST API。当我更新基本模型时，一切正常。但是当我在这种情况下尝试更新鉴别器对象sportEvent时，它不起作用。

Event.js - 事件数据模型具有所有集合通用的基本架构，并带有用于该集合的更多详细信息的鉴别器。

// base schema for all the events
// includes basic detail for all the events
const eventSchema = new Schema({
  //title for the event
  title: {
    type: String,
    required: true
  },

  //description for the events 
  description: {
    type: String,
    required: true
  },

  //event type for the event. such as Music, Sports, Expo, Leisure
  eventType: {
    type: String,
    required: true,
  }
}, { discriminatorKey: 'eventType' });

//sport event model for extending the basic event model
const sportEvent = Event.discriminator("sports", new Schema({
  sportEvent: {
    //sport name. for eg: cricket, football, etc
    sportName: {
      type: String,
      required: true
    },
    //first team name
    firstTeam: {
      type: String,
      required: true
    },
    //second team name
    secondTeam: {
      type: String,
      required: true
    },
  }
}));

EventController.js - 具有用于更新集合的 PUT 方法。这是一个代码sn-p。

//for updating the event added a PUT method in /event route
router.put('/events/:eventId', function(req, res, next){
  //getting the event id form the url
  eventId = req.params.eventId;

  //checking the provided event id is a valid mongodb _id object or not
  if(objectId.isValid(eventId)){
    Event.findOneAndUpdate({_id: eventId}, {$set: req.body}, {new: true, runValidators: true}, function(err, event){
      if(err) {
        next(err);
      }
      sendResponse(res, "Event Successfully Updated", event);
    });
  } else {
    //sending a bad request error to the user if the event id is not valid
    sendError(res, 400, "Invalid Event ID");
  }
});

Answer 1

确保鉴别键存在于更新对象中，或者作为更新函数的参数，根据鉴别键编写一个switch case，在特定的Schema类型上调用更新

callback = function(err, doc){
    if(err) console.log(err)
    console.log(doc)
};

var id = ObjectId("5a75d22e6dabf3102c059f56");

var update = {
    title : 'title-name',
    eventType : 'sports' ,
    sportEvent : {
        firstTeam : 'first-name',
        secondTeam : 'second-name',
        sportName : 'sport-name'
    }
};

switch(update.eventType){
    case 'sports':
        SportEventSchema.findByIdAndUpdate(id, {$set : update}, {new : true, upsert : false}, callback)
        break;
    case 'games':
        GameEventSchema.findByIdAndUpdate(id, {$set : update}, {new : true, upsert : false}, callback)
        break;
    default:
        Event.findByIdAndUpdate(id, {$set : update}, {new : true, upsert : false}, callback);
        break;
}

输出：运动事件类型的更新

Mongoose: events.findAndModify({ eventType: 'sports', _id: ObjectId("5a75d22e6dabf3102c059f56") }, [], { '$set': { title: 'title-name', eventType: 'sports', sportEvent: { firstTeam: 'first-name', secondTeam: 'second-name', sportName: 'sport-name' } } }, { new: true, upsert: false, remove: false, fields: {} })
{ sportEvent:
   { firstTeam: 'first-name',
     secondTeam: 'second-name',
     sportName: 'sport-name' },
  eventType: 'sports',
  _id: 5a75d22e6dabf3102c059f56,
  title: 'title-name',
  description: 'desc',
  __v: 0 }