starter files

1 files changed, 71 insertions, 0 deletions

diff --git a/finished-application/frontend/components/DeleteItem.js b/finished-application/frontend/components/DeleteItem.js
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+++ b/finished-application/frontend/components/DeleteItem.js
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+import React from 'react';
+import { Mutation } from 'react-apollo';
+import PropTypes, { number } from 'prop-types';
+import gql from 'graphql-tag';
+import { withRouter } from 'next/router';
+import { ALL_ITEMS_QUERY } from './Items';
+import { PAGINATION_QUERY } from './Pagination';
+import { perPage } from '../config';
+
+const DELETE_ITEM_MUTATION = gql`
+  mutation deleteItem($id: ID!) {
+    deleteItem(id: $id) {
+      id
+      title
+      description
+    }
+  }
+`;
+
+class DeleteItem extends React.Component {
+  static propTypes = {
+    id: PropTypes.string.isRequired,
+  };
+
+  update = (cache, payload) => {
+    const deletedItem = payload.data.deleteItem;
+    let { page = 1 } = this.props.router.query;
+    page = parseFloat(page);
+    const skip = page * perPage - perPage;
+    const variables = { skip };
+    const data = cache.readQuery({ query: ALL_ITEMS_QUERY, variables });
+    // filter this one out
+    data.items = data.items.filter(item => item.id !== deletedItem.id);
+    // write the data back to the cache
+    console.log(data.items);
+    cache.writeQuery({ query: ALL_ITEMS_QUERY, data, variables });
+    // FYI Pagination is broken with Apollo currently - will make a followup video
+  };
+
+  render() {
+    return (
+      <Mutation
+        mutation={DELETE_ITEM_MUTATION}
+        variables={{ id: this.props.id }}
+        refetchQueries={[
+          {
+            query: ALL_ITEMS_QUERY,
+            variables: { skip: (this.props.router.query.page || 1) * perPage - perPage },
+          },
+          { query: PAGINATION_QUERY },
+        ]}
+        update={this.update}
+      >
+        {(removeItem, { error }) => (
+          <button
+            onClick={() => {
+              if (confirm('Are you sure you want to delete this item?')) {
+                removeItem();
+              }
+            }}
+          >
+            {error ? error.message : '× Delete Item'}
+          </button>
+        )}
+      </Mutation>
+    );
+  }
+}
+
+export default withRouter(DeleteItem);
+export { DELETE_ITEM_MUTATION };