amazon-web-services - 数据存储 - 架构未初始化。 DataStore 将无法按预期运行

Question

我正在开发一个应用程序，该应用程序将 AppSync 与来自 aws 的 graphql 结合使用，但每当我运行以下代码行 DataStore.start() 时，都会出现以下错误:

[错误] 数据存储 - 架构未初始化。 DataStore 将无法按预期运行。如果您安装了多个版本的 DataStore，则可能会发生这种情况。请参阅https://docs.amplify.aws/lib/troubleshooting/upgrading/q/platform/js/#check-for-duplicate-versions

我不知道还能做什么。我什至从0开始一个应用程序，也出现了同样的问题。我已经删除了 node_modules 文件夹并再次安装了所有内容，但它不会，而且我想不出一种方法来映射可能的错误。下面是代码和包。

import Amplify, { API, Auth, DataStore, Hub, Storage } from 'aws-amplify';
import awsmobile from './src/aws-exports';
import awsapigateway from './src/aws-api-gateway';

Amplify.Logger.LOG_LEVEL = 'DEBUG';
Amplify.configure(awsmobile);
API.configure(awsapigateway);

DataStore.start()
.then(() => console.log('DataStore started'))
.catch(e => console.log('Error init datastore: ', e))
.finally(() => console.log('DataStore finally'));

package.json

 "dependencies": {
    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.16.7",
    "@babel/plugin-proposal-optional-chaining": "^7.16.7",
    "@babel/plugin-syntax-flow": "^7.14.5",
    "@babel/plugin-transform-react-jsx": "^7.14.9",
    "@react-native-async-storage/async-storage": "^1.17.7",
    "@react-native-community/geolocation": "^2.0.2",
    "@react-native-community/netinfo": "^9.3.0",
    "@react-native-picker/picker": "^2.4.0",
    "@react-navigation/bottom-tabs": "^6.2.0",
    "@react-navigation/native": "^6.0.8",
    "@react-navigation/stack": "^6.1.1",
    "amazon-cognito-identity-js": "^5.2.8",
    "aws-amplify": "^4.3.26",
    "graphql": "16.5.0",
    "graphql-tools": "^8.3.0",
    "moment": "^2.29.1",
    "prettier": "^2.6.0",
    "prop-types": "^15.8.1",
    "radio-buttons-react-native": "^1.0.4",
    "react": "^17.0.2",
    "react-native": "^0.68.2",
    "react-native-android-location-services-dialog-box": "^2.8.2",
    "react-native-bootsplash": "^4.1.4",
    "react-native-debugger": "^1.1.0",
    "react-native-elements": "^3.4.2",
    "react-native-fs": "^2.19.0",
    "react-native-gesture-handler": "2.5.0",
    "react-native-get-random-values": "^1.7.2",
    "react-native-image-pan-zoom": "^2.1.12",
    "react-native-linear-gradient": "^2.5.6",
    "react-native-loading-spinner-overlay": "^3.0.0",
    "react-native-permissions": "^3.3.1",
    "react-native-pressable-opacity": "^1.0.8",
    "react-native-reanimated": "^2.8.0",
    "react-native-safe-area-context": "^3.1.9",
    "react-native-screens": ">= 3.0.0",
    "react-native-sqlite-storage": "^6.0.1",
    "react-native-static-safe-area-insets": "^2.1.1",
    "react-native-vector-icons": "^9.1.0",
    "react-native-vision-camera": "^2.13.3",
    "typescript": "^4.6.2",
    "uuid": "^8.3.2",
    "vision-camera-code-scanner": "^0.2.0"
    },
    "devDependencies": {
    "@babel/core": "7.18.6",
    "@babel/preset-env": "7.18.6",
    "@babel/runtime": "^7.17.8",
    "@react-native-community/eslint-config": "^2.0.0",
    "@react-native-community/eslint-plugin": "^1.1.0",
    "babel-eslint": "^10.1.0",
    "babel-jest": "^28.1.1",
    "eslint": "^7.32.0",
    "eslint-config-airbnb": "^19.0.4",
    "eslint-config-prettier": "^8.5.0",
    "eslint-plugin-import": "^2.25.4",
    "eslint-plugin-jsx-a11y": "^6.5.1",
    "eslint-plugin-react": "^7.29.4",
    "eslint-plugin-react-hooks": "^4.3.0",
    "ini": "^1.3.5",
    "inquirer": "^6.5.1",
    "jest": "^28.1.1",
    "metro-react-native-babel-preset": "^0.71.2",
    "react-test-renderer": "^17.0.2"
    },

schema.graphql:"

type Subpoena @model @auth(rules: [{allow: public}]) {
id: id!
status: SyncStatus!
localImageStorage: AWSJSON
}

enum SyncStatus {
PENDING
DONATE
ERROR
}

Answer 1

我与类似的事情斗争了整整 24 小时，互联网上现有的答案/文档毫无用处。事实证明我正在做类似的事情:

import {MyModel} from `@src/models`;

如果您查看该文件，您会发现它调用了 initSchema()，这是需要调用以避免错误 DataStore - Schema is notinitialized 的函数。不幸的是，如果您不在任何地方使用该模型，import 就会被优化，并且 initSchema() 永远不会被调用。

恕我直言，亚马逊方面存在相当严重的错误。您可能希望在不调用代码中的 .save() 或 .query() 的情况下测试打开同步，这似乎是合理的。

在我的例子中，简单地添加这个就足够了:

console.log(MyModel);