Nested promises - IndexedDB transactions using Dexie

I have the following code where the modifying the db item base on an inner promise is not working.

    $('input[type=checkbox][name=checklist]:checked').each(function()
    {
        var collection=db.items.where("name").equals(checkbox.val());
        var success;
        collection.modify(function(item){
             var invokePromise;
                //invokePromise = a fucntion that returns a promise 
                //this invokepromise function needs the item from the db.

             invokePromise.then(function(thirdPartyResponse){
                    item.date=new Date();
                    item.attempts= item.attempts+1; <-- this is not being updated.
            }).catch(function(error){
                    delete this.value; <-- this is also not deleted

            });
        }); 
    });

from Nested promises - IndexedDB transactions using Dexie