Mongoose delete array element in document and save

Question

I have an array in my model document   I would like to delete elements in that array based on a key I provide and then update MongoDB   Is this possible   Here s my attempt    var mongoose   require  mongoose        Schema   mongoose Schema   var favorite   new Schema       cn  String      favorites  Array      module exports   mongoose model  Favorite   favorite   favorite     exports deleteFavorite   function  req  res  next        if  req params callback     null            res contentType    application javascript             Favorite find  cn  req params name   function  error  docs            var records     records   docs           if  error                process stderr write error                     docs 0   doc favorites remove  uid  req params deleteUid             Favorite save function  error  docs                var records     records   docs               if  error                    process stderr write error                             res send records                return next                             So far it finds the document but the remove nor save works

User · Answer

Answers above are shown how to remove an array and here is how to pull an object from an array.

Reference: https://docs.mongodb.com/manual/reference/operator/update/pull/

db.survey.update( // select your doc in moongo
    { }, // your query, usually match by _id
    { $pull: { results: { $elemMatch: { score: 8 , item: "B" } } } }, // item(s) to match from array you want to pull/remove
    { multi: true } // set this to true if you want to remove multiple elements.
)

User · Answer

keywords    1 2 3 4   doc array pull 1    this remove one item from a array doc array pull    keywords     this remove multiple items in a array   if you want to use     you should call  use strict   at the top of your js file

User · Answer

The checked answer does work but officially in MongooseJS latest  you should use pull   doc subdocs push    id  4815162342       added doc subdocs pull    id  4815162342       removed   https   mongoosejs com docs api html mongoosearray MongooseArray-pull  I was just looking that up too   See Daniel s answer for the correct answer  Much better

User · Answer

You can also do the update directly in MongoDB without having to load the document and modify it using code  Use the  pull or  pullAll operators to remove the item from the array    Favorite updateOne   cn  req params name      pullAll   uid   req params deleteUid           you can also use updateMany for multiple documents   http   docs mongodb org manual reference operator update pullAll

User · Answer

This is working for me and really very helpful   SubCategory update    id     in          arrOfSubCategory map function  obj                return mongoose Types ObjectId obj                                      pull                coupon  couponId                     multi  true    function  err  numberAffected            if err                return callback                   error err                                       I have a model which name is SubCategory and I want to remove Coupon from this category Array  I have an array of categories so I have used arrOfSubCategory  So I fetch each array of object from this array with map function with the help of  in operator

User · Answer

Since favorites is an array  you just need to splice it off and save the document   var mongoose   require  mongoose        Schema   mongoose Schema   var favorite   new Schema       cn  String      favorites  Array      module exports   mongoose model  Favorite   favorite    exports deleteFavorite   function  req  res  next        if  req params callback     null            res contentType    application javascript                Changed to findOne instead of find to get a single document with the favorites      Favorite findOne  cn  req params name   function  error  doc            if  error                res send null  500             else if  doc                var records     records   doc                  find the delete uid in the favorites array             var idx   doc favorites   doc favorites indexOf req params deleteUid    -1                 is it valid              if  idx     -1                       remove it from the array                  doc favorites splice idx  1                      save the doc                 doc save function error                        if  error                            console log error                           res send null  500                         else                              send the records                         res send records                                                                stop here  otherwise 404                 return                                     send 404 not found         res send null  404

[node.js] Mongoose delete array element in document and save

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