Changing values in object using Mongoose in MongoDB

Question

Changing values in object using Mongoose in MongoDB

Currently, I have a basic collection stored in MongoDB using Mongoose.

My users model consists of a single field of type object, and I am looking to dynamically modify this object. However, despite my attempts using findByIdAndUpdate(), findById, findOne(), and findOneAndUpdate(), the code does not seem to be working as expected.

const UsersSchema = mongoose.Schema({
        likes: {}
    },
    { collection: 'users' });

const Users = mongoose.model('Users', UsersSchema);
const id ="5b4c540f14f353a4b9875af4";
const themes = ['foo', 'bar'];

Users.findById(id, (err, res) => {

    themes.map(item => {
        if (res.likes[item]) {
            res.likes[item] = res.likes[item] + 1;
        } else {
            res.likes[item] = 1;
        }
    });

    res.save();
});

javascript mongodb mongoose

Answer 1

Answer №1

In order to resolve this issue, I suggest expanding the fields in your schema:

Below is an example using this data:

const UsersSchema = new mongoose.Schema({
  likes :[
    {
      thema:{
        type: String
      },
      likes_amount:{
        type: Number
      },
      _id:false
    }]
});

module.exports = mongoose.model('Users', UsersSchema);

An additional user has been included:

   var newUser = new UserModel({
      likes:[{
        thema:'foo',
        likes_amount:1
       }]
   });
   newUser.save();

https://i.sstatic.net/o0PMJ.png

Here is the code that increments the number of likes per theme:

 const themes = ['foo', 'bar'];
  const userId = "5b4d0b1a1ce6ac3153850b6a";

  UserModel.findOne({_id:userId})
    .then((result) => {

      var userThemes = result.likes.map(item => {
        return item.thema;
      });

      for (var i = 0; i < themes.length; i++) {
        //if it exists, increment by 1 like
        if (userThemes.includes(themes[i])) {
          UserModel.update({_id: result._id, "likes.thema" : themes[i]}, {$inc: {"likes.$.likes_amount": 1}})
            .then((result) => {
              console.log(result);
            }).catch((err) => {
              console.log(err)
            });
        } else {
         //if it doesn't exist, create a theme with 1 like
          UserModel.update({_id: result._id},
            {
              $addToSet: {
                likes: {
                  $each: [{thema: themes[i], likes_amount: 1}]
                }
              }})
            .then((result) => {
              console.log(result);
            }).catch((err) => {
              console.log(err)
            });
        }
      }
    }).catch((err) => {
     console.log(err)
    });

Database outcome after increment:

https://i.sstatic.net/rZar9.png

I hope this explanation is helpful to you.

Answer 2

In order to resolve this issue, I suggest expanding the fields in your schema:

Below is an example using this data:

const UsersSchema = new mongoose.Schema({
  likes :[
    {
      thema:{
        type: String
      },
      likes_amount:{
        type: Number
      },
      _id:false
    }]
});

module.exports = mongoose.model('Users', UsersSchema);

An additional user has been included:

   var newUser = new UserModel({
      likes:[{
        thema:'foo',
        likes_amount:1
       }]
   });
   newUser.save();

https://i.sstatic.net/o0PMJ.png

Here is the code that increments the number of likes per theme:

 const themes = ['foo', 'bar'];
  const userId = "5b4d0b1a1ce6ac3153850b6a";

  UserModel.findOne({_id:userId})
    .then((result) => {

      var userThemes = result.likes.map(item => {
        return item.thema;
      });

      for (var i = 0; i < themes.length; i++) {
        //if it exists, increment by 1 like
        if (userThemes.includes(themes[i])) {
          UserModel.update({_id: result._id, "likes.thema" : themes[i]}, {$inc: {"likes.$.likes_amount": 1}})
            .then((result) => {
              console.log(result);
            }).catch((err) => {
              console.log(err)
            });
        } else {
         //if it doesn't exist, create a theme with 1 like
          UserModel.update({_id: result._id},
            {
              $addToSet: {
                likes: {
                  $each: [{thema: themes[i], likes_amount: 1}]
                }
              }})
            .then((result) => {
              console.log(result);
            }).catch((err) => {
              console.log(err)
            });
        }
      }
    }).catch((err) => {
     console.log(err)
    });

Database outcome after increment:

https://i.sstatic.net/rZar9.png

I hope this explanation is helpful to you.

Changing values in object using Mongoose in MongoDB

Answer №1

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