How to detect if a related record is loaded or not

Ember Data
1

We have a template that passes a related reference to a cart_item from the item.

  • The ITEM below has a belongsTo reference to cart_item.
  • It seems cart_item is not really loaded here, and requires to be asynchronously loaded with a “then”

How can I abstract this to work with both passed references from item.cart_item and pass in a cartItem record directly?

Passing in a loaded cartItem currently breaks with TypeError: cartItem.then is not a function.

{{#if item.cart_item}}
        <div {{action "changeQuantityOfCartItem" item.cart_item 1 bubbles=false}}></div>
{{/if}}


        /**
         * Change quantity of item in cart, through cart item
         * @param object the cartItem to change
         * @param int changeWith the amount we want to change with
         * @method changeQuantityOfCartItem
         */
        changeQuantityOfCartItem: function(cartItem, changeWith) {
            // Do someting as this seems to be a promise in our set case
            // BUT HOW WOULD I WORK WITH THE BELOW IF IT'S A REAL PASSED cartItem?
            cartItem.then(function(item){
                // MODIFY cartItem HERE!
                //
                //
            }.bind(this));
        },