使用nodejs更新mongodb中的数据

Question

I'm a beginner in NodeJS and mongodB and I'm using mongoose and trying to update data of product using this code

  return new Promise((resolve, reject) => {
    mongoose.connect(DB_URL, { useUnifiedTopology: true, useNewUrlParser: true }).then(() => 
            feature = new FaeturesModel({
              name: featureName,
              description: featureDesc,
              catagory: featureCatagory,
              price: featurePrice + ' IQD' ,
              image: featureImage,
              dateOfCreation: new Date().toJSON().slice(0, 10).replace(/-/g, '/')
            })).then(() => {
      return FaeturesModel.updateOne({"_id" : id} , {$set : {feature}})
            .then(()=> feature.save())
          .then(() => {
            mongoose.disconnect();
            resolve()
          }).catch(err => {
            mongoose.disconnect();
            reject(err)
          })
        }
      )
})}

the problem is that the record is added as a new one without deleting the old one

Answer 1

Saving the document creates a new one. If you want to update something:

await Model.updateOne({ _id: doc._id }, { $set: { name: 'foo' } })

Basically remove the .then(()=> feature.save()) and it'll work.

This is from the documentation .

EDIT

Sorry, I forgot to mention that when you're updating, you don't create a new document like this new Feature() instead you say:

Model.updateOne({ _id: id }, { $set: req.body }).then(res => {
  // do stuff
})

Because new Feature() creates a new document with a new _id attached to it, so you can't update the existing document.

Hope it's clear now:D

EDIT 2

This is not part of the question, but use

const schema = new Schema({
  ...
},
{ timestamps: true });

in your schema instead

dateOfCreation: new Date().toJSON().slice(0, 10).replace(/-/g, '/')

It's easier to save creation date.

Answer 2

exports.updateFeature = (id,featureName, featureCatagory, featurePrice , featureDesc , featureImage) => {
  return new Promise((resolve, reject) => {
    mongoose.connect(DB_URL, { useUnifiedTopology: true, useNewUrlParser: true }).then(() => 
            feature =({
              name: featureName,
              description: featureDesc,
              catagory: featureCatagory,
              price: featurePrice + ' IQD' ,
              image: featureImage,
              dateOfCreation: new Date().toJSON().slice(0, 10).replace(/-/g, '/')
            })).then(() => {
      return FaeturesModel.updateOne({'_id' : id} , {$set : feature})
            
          .then(() => {
            mongoose.disconnect();
            resolve()
          }).catch(err => {
            mongoose.disconnect();
            reject(err)
          })
        }
      )
})}```