I am working on a REST API using Node, Express and Mongoose. Everything works perfectly when I update the base model. But when I try to update the discriminator object sportEvent in this case, it doesn't work.
Event.js - Event data model has a base schema common for all the collections with a discriminator for additional detail for that collection.
// 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 - has a PUT method for updating the collection. Here is a code snippet.
//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}, {$set: req.body}, {new: true, runValidators: true}, function(err, event){ if(err) { next(err); } sendResponse(res, "Event Successfully Updated", event); }); } else { //sending a bad request error to the user if the event id is not valid sendError(res, 400, "Invalid Event ID"); } }); 1 Answers
Answers 1
Ensure the discriminator key is present in the update object, or as an argument to the update function, write a switch case based on discriminator key, call update on the specific Schema type
callback = function(err, doc){ if(err) console.log(err) console.log(doc) }; var id = ObjectId("5a75d22e6dabf3102c059f56"); var update = { title : 'title-name', eventType : 'sports' , sportEvent : { firstTeam : 'first-name', secondTeam : 'second-name', sportName : 'sport-name' } }; switch(update.eventType){ case 'sports': SportEventSchema.findByIdAndUpdate(id, {$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; } output : update for a sports event type
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 } 
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