isInCart() {
    var isInCart = this.$store.getters['shoppingCart/isInCart'](this.product.id);
    return isInCart;
  }

const getters = {
  count: state => state.items.length,
  hasItems: state => !!state.items.length,
  isInCart(state) {
    return id => state.items.findIndex((item) => {
      return item.productId === id;
    }) > -1;
  }
}

setCart(state, cart) {
    state.items = cart.items;
  },