Unable To Update Mongoose Model

I have a weird issue that is baffling me. I have a model: var Model = new Schema({ name: String, variations: Array }); The variations entry looks like this: [ {code: '', p

Solution 1:

When you modify the contents of an untyped Array field like variations, you need to notify Mongoose that you've changed its value by calling markModified(path) on the modified document or a subsequent save() call won't save it. See docs.

for(var i = p.variations.length - 1; i >=0; i--) {
    p.variations[i]['color'] = 'red';
  }
  p.markModified('variations');
  p.save(function(err) { ...

Solution 2:

You have to use the set function to change a property. The reasoning behind that is that mongoose has to mark the field as modified in order to be saved to the database.

for(var i = p.variations.length - 1; i >=0; i--) {
  p.variations[i].set({"color":"red", "code":"herr"});
  // or
  p.variations[i].set("color":"red");
  p.variations[i].set("code":"herr");
}

An alternative would be to change the field's value the old way, without going trought the setter, then manually mark it as modified: p.markModified('variations');

In my opinion you should always use the setter since this is more readable. You can just pass a json object containing all your changes in parameter and it will safely update the fields that you really want to change.