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import { Component } from 'react';
import { Mutation } from 'react-apollo';
import PropTypes from 'prop-types';
import gql from 'graphql-tag';
import User, { CURRENT_USER_QUERY } from './User';
const ADD_TO_CART_MUTATION = gql`
mutation addToCart($id: ID!) {
addToCart(id: $id) {
id
quantity
item {
id
price
description
image
title
}
}
}
`;
class AddToCart extends Component {
static propTypes = {
id: PropTypes.string.isRequired,
};
update = (cache, payload) => {
const newCartItem = payload.data.addToCart;
const data = cache.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];
}
cache.writeQuery({ query: CURRENT_USER_QUERY, data });
};
render() {
const { id } = this.props;
return (
<User>
{({ data: { me }, loading }) => {
if (!me || loading) return null;
return (
<Mutation mutation={ADD_TO_CART_MUTATION} variables={{ id }} update={this.update}>
{(addToCart, { loading }) => (
<button disabled={loading} onClick={addToCart}>
🛒 Add{loading && 'ing'} To Cart
</button>
)}
</Mutation>
);
}}
</User>
);
}
}
export default AddToCart;
export { ADD_TO_CART_MUTATION };
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