【发布时间】：2020-03-30 20:00:07
【问题描述】：
AWS 在 re:invent 2019 上推出了 Amplify DataStore。Datastore 是一个持久的设备上存储库，供开发人员写入、读取和观察数据更改。
根据公告，Amplify DataStore 允许开发人员编写利用分布式数据的应用程序，而无需为离线或在线场景编写额外的代码。 Amplify DataStore 可用作 Web 和移动应用程序中的独立本地数据存储，无需连接到云，也无需拥有 AWS 账户。底层是连接到应用同步 graphQl API 的数据存储。令人敬畏的功能是易于使用和离线功能。另见公告https://aws.amazon.com/de/blogs/aws/amplify-datastore-simplify-development-of-offline-apps-with-graphql/ 或文档https://aws-amplify.github.io/docs/js/datastore。
但是，amplify 支持流行的 Web 框架，例如 Angular、React 和 Vue。它还支持使用 React Native、iOS 的 Swift 或 Android 的 Java 开发的移动应用程序。
发布后，我有动力使用基于 react 原生应用和博览会的功能。
但是在 react native 和 expo 上使用 aws amplify 数据存储时出现错误“不支持节点”。
[Unhandled promise rejection: Error: Node is not supported]
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:63717:20 in getDefaultAdapter
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:63730:47 in Storage
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:64010:31 in ExclusiveStorage
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:61426:81 in <unknown>
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:60761:23 in step
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:60663:9 in <unknown>
- node_modules/promise/setimmediate/core.js:45:7 in tryCallTwo
- node_modules/promise/setimmediate/core.js:200:23 in doResolve
- node_modules/promise/setimmediate/core.js:66:12 in Promise
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:60642:34 in <unknown>
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:61204:17 in <unknown>
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:60761:23 in step
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:60663:9 in <unknown>
- node_modules/promise/setimmediate/core.js:45:7 in tryCallTwo
- node_modules/promise/setimmediate/core.js:200:23 in doResolve
- node_modules/promise/setimmediate/core.js:66:12 in Promise
- node_modules/@aws-amplify/datastore/dist/aws-amplify-datastore.js:60642:34 in <unknown>
* App.js:43:40 in loadData$
导入的数据存储和模型：
import { DataStore } from "@aws-amplify/datastore";
import { Post } from "./src/models";
import amplify from './aws-exports';
Amplify.configure(amplify);
并使用数据存储 API 创建加载数据：
async loadData() {
await DataStore.save(
new Post({
name: `My First Post`
})
).catch(err => {
console.error(err)
});
const posts = await DataStore.query(Post);
console.log(posts)
}
依赖关系：
"dependencies": {
"@aws-amplify/api": "^2.1.1",
"@aws-amplify/core": "^2.2.0",
"@aws-amplify/datastore": "^1.0.2",
"@aws-amplify/pubsub": "^2.1.1",
"aws-amplify": "1.2.2",
"expo": "^35.0.0",
"react": "16.8.3",
"react-dom": "16.8.3",
"react-native": "https://github.com/expo/react-native/archive/sdk-35.0.0.tar.gz",
"react-native-web": "^0.11.7"
}
【问题讨论】：
标签： amazon-web-services react-native expo aws-amplify aws-appsync