質問編集履歴
2
書式の改善
test
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@@ -194,66 +194,4 @@
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- You used a `BuildContext` that is an ancestor of the provider you are trying to read.
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Make sure that Consumer<BookListModel> is under your MultiProvider/Provider<BookListModel>.
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This usually happen when you are creating a provider and trying to read it immediatly.
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For example, instead of:
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```
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Widget build(BuildContext context) {
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return Provider<Example>(
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create: (_) => Example(),
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// Will throw a ProviderNotFoundError, because `context` is associated
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// to the widget that is the parent of `Provider<Example>`
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child: Text(context.watch<Example>()),
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),
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}
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```
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consider using `builder` like so:
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```
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Widget build(BuildContext context) {
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return Provider<Example>(
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create: (_) => Example(),
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// we use `builder` to obtain a new `BuildContext` that has access to the provider
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builder: (context) {
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// No longer throws
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return Text(context.watch<Example>()),
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}
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}
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```
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```
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1
書式の改善
test
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test
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@@ -159,3 +159,101 @@
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}
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```
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---
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エラー全文です????
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```error
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Error: Could not find the correct Provider<BookListModel> above this Consumer<BookListModel> Widget
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This likely happens because you used a `BuildContext` that does not include the provider
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of your choice. There are a few common scenarios:
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- The provider you are trying to read is in a different route.
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Providers are "scoped". So if you insert of provider inside a route, then
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other routes will not be able to access that provider.
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- You used a `BuildContext` that is an ancestor of the provider you are trying to read.
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+
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197
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+
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198
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+
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199
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Make sure that Consumer<BookListModel> is under your MultiProvider/Provider<BookListModel>.
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200
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+
|
|
201
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+
This usually happen when you are creating a provider and trying to read it immediatly.
|
|
202
|
+
|
|
203
|
+
|
|
204
|
+
|
|
205
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+
For example, instead of:
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206
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+
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207
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+
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208
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+
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209
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+
```
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Widget build(BuildContext context) {
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return Provider<Example>(
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+
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create: (_) => Example(),
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+
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// Will throw a ProviderNotFoundError, because `context` is associated
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+
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219
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+
// to the widget that is the parent of `Provider<Example>`
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+
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child: Text(context.watch<Example>()),
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),
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}
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```
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228
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+
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229
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+
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230
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+
|
|
231
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+
consider using `builder` like so:
|
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232
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+
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|
233
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+
|
|
234
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+
|
|
235
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+
```
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+
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Widget build(BuildContext context) {
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return Provider<Example>(
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+
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create: (_) => Example(),
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+
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243
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+
// we use `builder` to obtain a new `BuildContext` that has access to the provider
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244
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+
|
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245
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+
builder: (context) {
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246
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+
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247
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// No longer throws
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248
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+
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return Text(context.watch<Example>()),
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+
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}
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252
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+
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),
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254
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+
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255
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+
}
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256
|
+
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257
|
+
```
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```
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