MongoDB update multiple records of array [duplicate]

Answer 1

If you know the indexes you want to update you can do this with no problems like this:

var update = { $set: {} };
for (var i = 0; i < indexesToUpdate.length; ++i) {
  update.$set[`comments.${indexesToUpdate[i]}. avatar`] = "new_avatar.jpg";
}
Comments.update({ "comments.user":"test" }, update, function(error) {
  // ...
});

• be aware that must of the IDE's will not accept the syntax but you can ignore it.