Video 21

1 files changed, 48 insertions, 0 deletions

diff --git a/stepped-solutions/21/frontend/components/DeleteItem.js b/stepped-solutions/21/frontend/components/DeleteItem.js
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+++ b/stepped-solutions/21/frontend/components/DeleteItem.js
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+import React, { Component } from 'react';
+import { Mutation } from 'react-apollo';
+import gql from 'graphql-tag';
+import { ALL_ITEMS_QUERY } from './Items';
+
+const DELETE_ITEM_MUTATION = gql`
+  mutation DELETE_ITEM_MUTATION($id: ID!) {
+    deleteItem(id: $id) {
+      id
+    }
+  }
+`;
+
+class DeleteItem extends Component {
+  update = (cache, payload) => {
+    // manually update the cache on the client, so it matches the server
+    // 1. Read the cache for the items we want
+    const data = cache.readQuery({ query: ALL_ITEMS_QUERY });
+    console.log(data, payload);
+    // 2. Filter the deleted itemout of the page
+    data.items = data.items.filter(item => item.id !== payload.data.deleteItem.id);
+    // 3. Put the items back!
+    cache.writeQuery({ query: ALL_ITEMS_QUERY, data });
+  };
+  render() {
+    return (
+      <Mutation
+        mutation={DELETE_ITEM_MUTATION}
+        variables={{ id: this.props.id }}
+        update={this.update}
+      >
+        {(deleteItem, { error }) => (
+          <button
+            onClick={() => {
+              if (confirm('Are you sure you want to delete this item?')) {
+                deleteItem();
+              }
+            }}
+          >
+            {this.props.children}
+          </button>
+        )}
+      </Mutation>
+    );
+  }
+}
+
+export default DeleteItem;