ApolloProvider没有被传递给客户端实例

Question

我已经用GraphQL安装了我的。一旦我启动了新的项目，并按照graphql的设置使用了react本机，我就得到了这个错误。

ApolloProvider没有被传递给客户端实例。确保你通过客户端通过你的客户。

我从上到下一直跟踪这个文档。

apollo.js

import {HttpLink} from 'apollo-link-http';
import {ApolloClient} from 'apollo-client';
import {InMemoryCache} from 'apollo-cache-inmemory';

const makeApolloClient = token => {
  // create an apollo link instance, a network interface for apollo client
  const link = new HttpLink({
    uri: `https://learn.hasura.io/graphql`,
    headers: {
      Authorization: `Bearer ${token}`,
    },
  });
  // create an inmemory cache instance for caching graphql data
  const cache = new InMemoryCache();
  // instantiate apollo client with apollo link instance and cache instance
  const client = new ApolloClient({
    link,
    cache,
  });
  return client;
};
export default makeApolloClient;

App.js

import React from 'react';
import AppContainer from '../routes/Routes';
import AsyncStorage from '@react-native-community/async-storage';
import {ApolloProvider} from 'react-apollo';
import makeApolloClient from '../apollo/apollo';

console.disableYellowBox = true;

class App extends React.Component {
  state = {
    client: null,
  };

  async componentDidMount() {
    // fetch session
    const session = await AsyncStorage.getItem('@todo-graphql:session');
    const sessionObj = JSON.parse(session);
    const {token, id} = sessionObj;
    // make apollo client with this session token
    const client = makeApolloClient(token);
    // start emitting events saying that the useri s online
    this.setState({client});
  }

  render() {
    return (
      <ApolloProvider client={this.state.client}>
        <AppContainer />
      </ApolloProvider>
    );
  }
}

export default App;

误差

​

​

"apollo-cache-inmemory": "^1.6.3",
"apollo-client": "^2.6.4",
"apollo-link-http": "^1.5.16",
"react": "16.9.0",
"react-apollo": "^3.1.3",
"react-native": "0.61.3",

Answer 1

在componentDidMount之前调用Render。因此，客户端实例在第一次呈现时将为空。这将导致错误。将呈现方法修改为

render() {
  if(!this.state.client) {
    return <Text>Loading</Text>
  }
  return (
      <ApolloProvider client={this.state.client}>
        <AppContainer />
      </ApolloProvider>
    );
}