设置AWSAppSyncClient、Apollo和React的正确方法

Question

我在开始使用React、Apollo和AWS-AppSync时遇到了一些问题。我无法解决此错误消息：

TypeError: this.currentObservable.query.getCurrentResult is not a function

我使用的是@apollo/react-hooks和aws-appsync的更新包。

我当前的设置如下所示。

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

import config from './aws-exports';
import AWSAppSyncClient from 'aws-appsync';
import { ApolloProvider } from '@apollo/react-hooks';

const client = new AWSAppSyncClient({
    url: config.aws_appsync_graphqlEndpoint,
    region: config.aws_appsync_region,
    auth: {
        type: config.aws_appsync_authenticationType,
        apiKey: config.aws_appsync_apiKey
    }
});

ReactDOM.render(
    <ApolloProvider client={client}>
        <React.StrictMode>
            <App />
        </React.StrictMode>
    </ApolloProvider>,
    document.getElementById('root')
);

我有一个函数，它生成一个查询，如下所示：

import React from 'react';
import { useQuery } from '@apollo/react-hooks';
import gql from 'graphql-tag';

const Flavors = () => {

    const GET_FLAVORS = gql`
        query listAll {
            items {
                name,
                image
            }
        }
    `;

    const { loading, error, data } = useQuery(GET_FLAVORS);

    if(loading) return <p>loading...</p>
    if(error) return <p>Something went wrong...</p>

    return (
        <div>
        {
            data.listIceCreamTypes.items.map(type => {
                return <div key={type.name}>
                    <img src={type.image} alt={type.name} />
                    <h1>{type.name}</h1>
                </div>
            })
        }
        </div>
    )
}

export default Flavors;

我已经了解了https://github.com/apollographql/react-apollo/issues/3148中描述的各种解决方案，例如添加：

"resolutions": {
    "apollo-client": "2.6.3"
 }

敬package.json。然后重新运行npm install并重新启动服务器。

似乎没有什么能解决我的问题。

编辑**这是一个重现问题的仓库：https://github.com/Rynebenson/IceCreamQL

Answer 1

我已经在stackoverflow上的其他相关问题上回答了这个问题。

正如在other answer中提到的，这个问题是因为aws-appsync依赖于以前的版本apollo-client。使用解决方案并不是解决这个问题的“干净”方法，因为你正在修复一个与这个库不完全兼容的依赖版本。

我强烈建议您通过以下方式为亚马逊AppSync创建一个自定义的阿波罗客户端：

import { ApolloProvider } from '@apollo/react-hooks';
import { ApolloLink } from 'apollo-link';
import { createAuthLink } from 'aws-appsync-auth-link';
import { createHttpLink } from 'apollo-link-http';
import { AppSyncConfig } from './aws-exports';
import ApolloClient from 'apollo-client';

const url = AppSyncConfig.graphqlEndpoint;
const region = AppSyncConfig.region;
const auth = {
  type: AppSyncConfig.authenticationType,
  apiKey: AppSyncConfig.apiKey
};
const link = ApolloLink.from([
   createAuthLink({ url, region, auth }), 
   createHttpLink({ uri: url })
]);
const client = new ApolloClient({
  link,
  cache: new InMemoryCache()
});

const WithProvider = () => (
  <ApolloProvider client={client}>
    <App />
  </ApolloProvider>
)

export default WithProvider

我还在medium上创建了一个更详细的帖子

Answer 2

想要发布我的经验，这是最近的。被接受的答案仍然是正确的。aws-appsync使用的是过时的软件包，与最新版本的阿波罗客户端相冲突。

import React from 'react';
import PropTypes from 'prop-types';

// Apollo Settings
import { ApolloClient, ApolloProvider, InMemoryCache } from '@apollo/client';
import { ApolloLink } from 'apollo-link';

// AppSync
import { Auth } from 'aws-amplify';
import { createAuthLink } from 'aws-appsync-auth-link';
import { createHttpLink } from 'apollo-link-http';
import awsconfig from 'assets/lib/aws-exports';

// jwtToken is used for AWS Cognito.
const client = new ApolloClient({
  link: ApolloLink.from([
    createAuthLink({
      url: awsconfig.aws_appsync_graphqlEndpoint,
      region: awsconfig.aws_appsync_region,
      auth: {
        type: awsconfig.aws_appsync_authenticationType,
        apiKey: awsconfig.aws_appsync_apiKey,
        jwtToken: async () => (await Auth.currentSession()).getAccessToken().getJwtToken(),
      },
    }),
    createHttpLink({ uri: awsconfig.aws_appsync_graphqlEndpoint }),
  ]),
  cache: new InMemoryCache(),
});

const withApollo = ({ children}) => {
  return <ApolloProvider client={client}><App /></ApolloProvider>;
};

withApollo.propTypes = {
  children: PropTypes.object,
  authData: PropTypes.object,
};

export default withApollo;

Package.json

"@apollo/client": "^3.3.15",
"@apollo/react-hooks": "^4.0.0",
"apollo-link": "^1.2.14",
"apollo-link-http": "^1.5.17",
"aws-amplify": "^3.3.27",
"aws-amplify-react-native": "^4.3.2",
"aws-appsync-auth-link": "^3.0.4",

Answer 3

您必须初始化appsync，如下所示。

const graphqlClient = new appsync.AWSAppSyncClient({
url: graphqlEndpoint,
region: process.env.AWS_REGION,
auth: {
    type: 'AWS_IAM',
    credentials: {
        accessKeyId: process.env.AWS_ACCESS_KEY_ID,
        secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
        sessionToken: process.env.AWS_SESSION_TOKEN
    }
},
disableOffline: true

})；