CODEWITHSUNDEEP
arraysnode.jsmongodb
Toan Tran
Toan Tran

Reputation: 2047

Can't compare MongoDB data with javascript array

I want to compare the data which I got from Mongo to javascript array. I am using lodash to compare. But it always return incorrect result.

var editUser = function(userData, getOutFunction) {
    var status = CONSTANTS.NG;
    checkExistUser(userData._id).then(function(user) {
        if (user !== null) {
            var userGroup = JSON.stringify(user.group);
            user.group = user.group.map((groupId) => {
                return groupId.toString();
            });
            var removedGroups = _.difference(userGroup, userData.group);
            var addedGroups = _.difference(userData.group, userGroup);
            console.log('Removed Groups: ', removedGroups);
            console.log('Added Groups: ', addedGroups);
        } else {
            status = CONSTANTS.NG;
            logger.debug(DEBUG_CLASS_NAME, "Cannot find object");
            if (typeof(getOutFunction) !== 'undefined') {
                getOutFunction(status, null);
            } else {
                NO_CALLBACK();
            }
        }
    }).catch(function() {
        console.log('Promise is error');
    });

    var checkExistUser = function(userId) {
        return new Promise(function(resolve, reject) {
            UserDAO.findById(userId, function(err, user) {
                if (err) {
                    logger.debug(DEBUG_CLASS_NAME, {
                        name: err.name,
                        code: err.code,
                        message: err.message,
                        method: "checkExist"
                    });
                    resolve(null);
                } else {
                    resolve(user);
                }
            });
        });
    }

For example:When I try to input value for lodash difference function

var user.group = ["58b8da67d585113517fed34e","58b8da6ed585113517fed34f"];
var userData.group = [ '58b8da67d585113517fed34e' ];

I want lodash difference return below result:

Removed Groups: ['58b8da6ed585113517fed34f']

Added Groups: []

However, the function gave me the result like:

Removed Groups: []

Added Groups: [ '58b8da67d585113517fed34e' ]

Can anyone help me in this case? I will do appreciate it.

Upvotes: 0

Views: 87

Answers (1)

Andy Macleod
Andy Macleod

Reputation: 3049

I have had this issue as well, the result from mongodb is an ObjectId type so you can compare the someObjectId.toString() value with your array of strings, or you could use

someObjectId.equals(stringOrObjectIdValue)

However, if you want to keep using lodash functions you will either have to force both arrays to strings or to ObjectIds before passing them into the function.

Upvotes: 1

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