propertyValueChange.js

ty.dulst.propertyValueChange = function(property, old, newString) {
  ty.dulst.cardsInterface.cardCollection.each(function(card) {
    var changeThisCard;
    var out = card.get(property);
    if (out && out === old) {
      changeThisCard = true;
    }

    if (changeThisCard) {
      console.log("attempting to update", card.get("title"));
      card.save(property, newString, {
        error: function() {},
        success: function() {
          console.log(
            "updated",
            card.get("title"),
            "from",
            old,
            "to",
            newString
          );
        }
      });
    }
  });
};