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Code Issues Releases Wiki Activity

Follow best practice of ProxyProvider updating (#298)

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* Upgrade to pkg:provider 4.0

* Follow best practice of ProxyProvider updating

The addresses feedback from https://github.com/flutter/samples/issues/245. Instead of constructing a new `CartModel`, we merely update the `catalog` field.

We no longer need a fancy constructor, and `CartModel._catalog` cannot be final any more.
This commit is contained in:
Filip Hracek
2020-01-31 13:25:14 -08:00
committed by GitHub
parent 2fae307721
commit c121b2d2a6
4 changed files with 30 additions and 20 deletions
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8
provider_shopper/lib/main.dart
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@@ -27,9 +27,11 @@ class MyApp extends StatelessWidget {
// of ChangeNotifierProvider. Moreover, CartModel depends
// on CatalogModel, so a ProxyProvider is needed.
ChangeNotifierProxyProvider<CatalogModel, CartModel>(
create: (context) => CartModel.empty(),
update: (context, catalog, previousCart) =>
CartModel(catalog, previousCart),
create: (context) => CartModel(),
update: (context, catalog, cart) {
cart.catalog = catalog;
return cart;
},
),
],
child: MaterialApp(