Correct usage of StreamBuilder (flutter#759)

https://docs.flutter.io/flutter/widgets/StreamBuilder-class.html I had some problems with using just `if (snapshot.hasData)`, i thought other users might benefit from the correct usage.
imenuo · Oct 17, 2018 · b235438 · b235438
1 parent f0d714c
commit b235438
Showing 1 changed file with 13 additions and 8 deletions.
diff --git a/packages/cloud_firestore/README.md b/packages/cloud_firestore/README.md
@@ -47,15 +47,20 @@ class BookList extends StatelessWidget {
     return StreamBuilder<QuerySnapshot>(
       stream: Firestore.instance.collection('books').snapshots(),
       builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
-        if (!snapshot.hasData) return Text('Loading...');
-        return ListView(
-          children: snapshot.data.documents.map((DocumentSnapshot document) {
-            return ListTile(
-              title: Text(document['title']),
-              subtitle: Text(document['author']),
+        if (snapshot.hasError)
+          return new Text('Error: ${snapshot.error}');
+        switch (snapshot.connectionState) {
+          case ConnectionState.waiting: return new Text('Loading...');
+          default:
+            return new ListView(
+              children: snapshot.data.documents.map((DocumentSnapshot document) {
+                return new ListTile(
+                  title: new Text(document['title']),
+                  subtitle: new Text(document['author']),
+                );
+              }).toList(),
             );
-          }).toList(),
-        );
+        }
       },
     );
   }