Fix a warning in the Networking Fetch Example (facebook#391)

ymainier · charpeni · commit e714d6230d32 · 2018-06-26T13:20:47.000-04:00
* Fix a warning in the Networking Fetch Example While running the fetch example, I saw this warning : ```ExceptionsManager.js:71 Warning: Failed child context type: Invalid child context `virtualizedCell.cellKey` of type `number` supplied to `CellRenderer`, expected `string`.``` I verified in the [doc](https://facebook.github.io/react-native/docs/flatlist.html#keyextractor), `keyExtractor` should return a `string`. * Add an id in movies.json and use this id as key
diff --git a/docs/network.md b/docs/network.md
@@ -118,7 +118,7 @@ export default class FetchExample extends React.Component {
         <FlatList
           data={this.state.dataSource}
           renderItem={({item}) => <Text>{item.title}, {item.releaseYear}</Text>}
-          keyExtractor={(item, index) => index}
+          keyExtractor={({id}, index) => id}
         />
       </View>
     );
diff --git a/website/static/movies.json b/website/static/movies.json
@@ -2,11 +2,11 @@
   "title": "The Basics - Networking",
   "description": "Your app fetched this from a remote endpoint!",
   "movies": [
-    { "title": "Star Wars", "releaseYear": "1977"},
-    { "title": "Back to the Future", "releaseYear": "1985"},
-    { "title": "The Matrix", "releaseYear": "1999"},
-    { "title": "Inception", "releaseYear": "2010"},
-    { "title": "Interstellar", "releaseYear": "2014"}
+    { "id": "1", "title": "Star Wars", "releaseYear": "1977"},
+    { "id": "2", "title": "Back to the Future", "releaseYear": "1985"},
+    { "id": "3", "title": "The Matrix", "releaseYear": "1999"},
+    { "id": "4", "title": "Inception", "releaseYear": "2010"},
+    { "id": "5", "title": "Interstellar", "releaseYear": "2014"}
   ]
 }
 
