CODEWITHSUNDEEP
mongodbmongoose
Dan Tang
Dan Tang

Reputation: 1333

Saving mixed schema in mongoose (markModified doesn't seem to work)

I have a mongodb model called word, which has a mixed schema type variable called "appearance". Given a passed in array of words, I would like to store the list into the words collection. If the word already exist, check if the appearance field is different, and if so, push the corresponding lesson in the field, then save.

Where I'm having trouble is it is not saving correctly. I realise this is similar to the following problem, but I tried using xxx.markModified() but to no avail (Updating values in mongodb). Does anyone know how to solve it?

My schema is 

word
    -> appearance
    -> word


//takes an array of words, and stores it in mongodb
function importWords(arr) {

  arr.forEach(function(arrWord) {
    Word.find({word: arrWord.word}, function(err, results) {
      if(err) {
        console.log('error');
        return;
      }

      //entry doesn't exist yet
      if(results.length === 0) {
        Word.create(arrWord, function(err, result) {
          console.log(result);
        });
      }
      else {
        var key = Object.keys(arrWord.appearance)[0],
          lessons = arrWord.appearance[key];

        //if the course is different, create a new entry 
        if (typeof results[0].appearance[key] === 'undefined') {
          results[0].appearance[key] = lessons;
        } else {
          for (var i = 0, len = lessons.length; i < len; i++) {
            //if the lesson is not in the current results, create an entry
            if (results[0].appearance[key].indexOf(lessons[i]) === -1) {
              results[0].appearance[key].push(lessons[i]);
            } //end if statement
          } //end for loop          
        } //end if-else statement

        results[0].markModified('appearance');
        results[0].save();
        console.log(results[0])
        console.log('***************');
      }
    })
  }) 
}

var list = [
  { word: '我', appearance: { elementary_one_writing: [1, 8]

Upvotes: 1

Views: 2306

Answers (1)

Alexander Gonchiy
Alexander Gonchiy

Reputation: 947

The save method is asynchronous, which means you can't be sure it has finished its work the way you write your code now. Use callbacks:

results[0].save( function(error){
  if (error){
    // augh!
  }else{
    console.log(results[0]); // <- yay! the document is definitely saved here
    // ...
  }
});

//console.log(results[0]); // <- no, we can't be sure results[0] is already saved in this line

Upvotes: 2

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