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import { Component } from 'react';
import { Mutation } from 'react-apollo';
import PropTypes from 'prop-types';
import { ADD_TO_CART_MUTATION, CURRENT_USER_QUERY } from '../queries/index';
class AddToCart extends Component {
static propTypes = {
id: PropTypes.string.isRequired,
};
update = (proxy, payload) => {
const newCartItem = payload.data.addToCart;
const data = proxy.readQuery({ query: CURRENT_USER_QUERY });
const existingIndex = data.me.cart.findIndex(cartItem => cartItem.id === newCartItem.id);
if (existingIndex >= 0) {
// already in cache, just replace it
data.me.cart = [...data.me.cart.slice(0, existingIndex), newCartItem, ...data.me.cart.slice(existingIndex + 1)];
} else {
data.me.cart = [...data.me.cart, newCartItem];
}
proxy.writeQuery({ query: CURRENT_USER_QUERY, data });
};
render() {
const { id } = this.props;
return (
<Mutation mutation={ADD_TO_CART_MUTATION} variables={{ id }} update={this.update}>
{addToCart => <button onClick={addToCart}>🛒 Add To Cart</button>}
</Mutation>
);
}
}
export default AddToCart;
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