I can't prevent creating duplicated documents.

[okanakdogan]

Issue Description

I have similiar issue with this stackoverflow question.

I want to create objects to a collection for per user. I will save scores in this collection. When I want to update user's score, if there isn't a score entry in that collection, i want to create a new object. if there is a score object i want to update it.

But with my current code, sometimes creates new score entries even there is a entry for that user.

function saveScore(user_id , score){
  var query= new Parse.Query(ScoreObject);
  query.equalTo("user_id",user_id );

  query.first().then(
        function(result){
               if(result === undefined){
                     // there isn't entry for this id
                     //create ScoreObject and fill it
                     ...
                      newObject.set("user_id",id);
                      newObject.set("score",score);
                      newObject.save();
               }else{
                       // entry found for this id
                       //do update on result and save
                       ...
                       result.increment("score",score);
                       result.save();
                }
         }
   );

}

I'm looping on every played games and calculating points, looking for user and add score that user.

for(int i=0; i<games.length; ++i){
          //calculate point
          //get user id
          var user_id = games[i].get("user_id");
          saveScore(user_id,point); // this should find user's uniqe score entry
          //but creates new score entries eveb if there entry for that user.
}

Steps to reproduce

i have users in User table.
i have a collection that holds scores with user id reference (fields: _id, user_id, month,score)

Expected Results

Score entries for per user.

Actual Outcome

more than one entry for some users.

Environment Setup

• Server

  • parse-server version (Be specific! Don't say 'latest'.) : [2.6.5]
  • Operating System: Heroku Dyno
  • Hardware: Heroku Web App
  • Localhost or remote server? (AWS, Heroku, Azure, Digital Ocean, etc): [Heroku]

• Database

  • MongoDB version: [3.4.9]
  • Localhost or remote server? (AWS, mLab, ObjectRocket, Digital Ocean, etc): [mLab]

[flovilmart]

In beforeSave, you can abort the save by calling response.error() but not return a different object.