move finished folder

1 files changed, 71 insertions, 0 deletions

diff --git a/finished-application/frontend/components/RemoveFromCart.js b/finished-application/frontend/components/RemoveFromCart.js
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+++ b/finished-application/frontend/components/RemoveFromCart.js
@@ -0,0 +1,71 @@
+import React from 'react';
+import { Mutation } from 'react-apollo';
+import styled from 'styled-components';
+import PropTypes from 'prop-types';
+import gql from 'graphql-tag';
+import { CURRENT_USER_QUERY } from './User';
+
+const REMOVE_FROM_CART_MUTATION = gql`
+  mutation removeFromCart($id: ID!) {
+    removeFromCart(id: $id) {
+      id
+    }
+  }
+`;
+
+const BigButton = styled.button`
+  font-size: 3rem;
+  background: none;
+  border: 0;
+  &:hover {
+    color: ${props => props.theme.red};
+    cursor: pointer;
+  }
+`;
+
+class RemoveFromCart extends React.Component {
+  static propTypes = {
+    id: PropTypes.string.isRequired,
+  };
+  // This gets called as soon as we get a response back from the server after a mutation has been performed
+  update = (cache, payload) => {
+    // 1. first read the cache
+    const data = cache.readQuery({ query: CURRENT_USER_QUERY });
+    // 2. remove that item from the cart
+    const cartItemId = payload.data.removeFromCart.id;
+    data.me.cart = data.me.cart.filter(cartItem => cartItem.id !== cartItemId);
+    // 3. write it back to the cache
+    cache.writeQuery({ query: CURRENT_USER_QUERY, data });
+  };
+  render() {
+    return (
+      <Mutation
+        mutation={REMOVE_FROM_CART_MUTATION}
+        variables={{ id: this.props.id }}
+        update={this.update}
+        optimisticResponse={{
+          __typename: 'Mutation',
+          removeFromCart: {
+            __typename: 'CartItem',
+            id: this.props.id,
+          },
+        }}
+      >
+        {(removeFromCart, { loading, error }) => (
+          <BigButton
+            disabled={loading}
+            onClick={() => {
+              removeFromCart().catch(err => alert(err.message));
+            }}
+            title="Delete Item"
+          >
+            &times;
+          </BigButton>
+        )}
+      </Mutation>
+    );
+  }
+}
+
+export default RemoveFromCart;
+export { REMOVE_FROM_CART_MUTATION };