CODEWITHSUNDEEP
javascriptnode.jsmongodbmongoose
ninehundreds
ninehundreds

Reputation: 1105

How to Delete Item from Object in NodeJS/Mongo Service

I'm querying for a user object and performing a series of updates on the items within compared to incoming postdata (jsObject). I'm wondering how to completely remove an item from the object...specifically a Date object (user[0].birthDate)...before I make a save of the updated user object. 

orm.User.find({ appId: appId, facebookUsername:usersFBUsername}).exec(function (error, user) {
        if (error) {
            console.log('Error in User Query: ' + error);
        }
        else if(Object.keys(user).length > 0) {

            if(jsObject.name != null)
                user[0].name = jsObject.name;

            if(jsObject.email != null)
                user[0].emailAddress = jsObject.email;

            if(jsObject.birthDate != null && jsObject.birthDate.length > 0) {
                user[0].birthDate = jsObject.birthDate;
            }
            else {
                console.log('delete it');
                //orm.User.update({_id:user._id}, {$pull:{birthDate:1}});
                //delete user[0].birthDate;
            }               
        }

        user[0].save(function (error) {
                if (error != null) {
                    console.log('An error has occurred while saving user:' + error);
                    response.end(results.getResultsJSON(results.ERROR, error));
                }
                else {
                    console.log('    [User Successfully Updated]');
                    response.end('{ "success": ' + JSON.stringify(user[0]) + ' }');
                }
            });
       });

You can see in the commented code some attempts I've made which have not been successful. I even gave this a try after the save completed, which also did not work:

orm.User.update({appId: appId, facebookUsername:usersFBUsername},{$pull:{birthDate:deleteBirthDate}})
                .exec(function(error){
                    if(error) {
                        console.log('oh well: ' + error);
                    }
                    else {
                        console.log('maybe maybe');
                    }
                });

I appreciate any suggestions.

Chris

Upvotes: 0

Views: 1093

Answers (1)

robertklep
robertklep

Reputation: 203304

$pull is for removing values from arrays, but you can use $unset: 

orm.User.update(
  {_id     : user._id},
  { $unset : { birthDate : 1 }},
  function(err, numAffected) { 
    ...
  }
);

For reference:

https://docs.mongodb.com/manual/reference/operator/update/unset/

Upvotes: 1

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