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将组件状态传递给react apollo的compose中的查询变量

react-apollo reactjs

Cris69 · 技术社区 · 6 年前

下面的React组件工作正常,我能够使用Apollo React查询GraphQL端点。在这种情况下,我用的是阿波罗反应器 compose 我想在HOC中动态注入 variables 字段,用户ID。 getUser() 似乎不管用,我只能得到一个承诺。

  class AllCardsScreen extends Component {

    state = {
      query: '',
      userCardsById: [],
      userId:'',
      loading: false,
    };

    getUser = async () => {
    await Auth.currentUserInfo()
      .then((data) => {
        this.setState({ userId: data.attributes.sub});
      })
      .catch(error => console.log(`Error: ${error.message}`));
    };

  render() {

    return (
      <View style={styles.container}>
        <FlatList
          data={this.props.userCardsList}
          keyExtractor={this.keyExtractor}
          renderItem={this.renderItem}
          ItemSeparatorComponent={this.renderSeparator}
          ListHeaderComponent={this.renderHeader}
          keyboardShouldPersistTaps="handled"
        />
      </View>
    );
  }


 export default compose(

  graphql(ListCards, {
    options: (props) => ({
      fetchPolicy: 'cache-and-network',
      variables: { userId : '18e946df-d3de-49a8-98b3-8b6d74dfd652'}
    }),        
    props: (props) => ({
         userCardsList: props.data.userCardsList ? props.data.userCardsList.userCards : [],

    }),
  })

  )(AllCardsScreen);

编辑: data.props.refetch() 函数来更新 变量 价值观。

 class AuthWrapper extends React.Component {

    state = {
      userId: null,
    }

    async componentDidMount () {
      const data = await Auth.currentUserInfo()
      this.setState({ userId: data.attributes.sub})
    }

    render () {
      return this.state.userId
        ? <AllCardsScreen {...this.state} {...this.props}/>
        : null
    }
  }


class AllCardsScreen extends Component {

    state = {
      query: '',
      userCardsById: [],
      userId:'',
      loading: false,
    };

  componentDidMount() {
    this.props.dataRefetch(this.props.userId)
    SplashScreen.hide();
  }

  render() {

    return (
      <View style={styles.container}>
        <FlatList
          data={this.props.userCardsList}
          keyExtractor={this.keyExtractor}
          renderItem={this.renderItem}
          ItemSeparatorComponent={this.renderSeparator}
          ListHeaderComponent={this.renderHeader}
          keyboardShouldPersistTaps="handled"
        />
      </View>
    );
  }


 export default compose(

  graphql(ListCards, {
    options: (props) => ({
      fetchPolicy: 'cache-and-network',
      variables: { userId : ''}
    }),        
    props: (props) => ({
    userCardsList: props.data.userCardsList ? props.data.userCardsList.userCards : [],
    dataRefetch: (userId) => {
        props.data.refetch({userId})
       },
    }),
  })

  )(AllCardsScreen);

1 回复 | 直到 6 年前

Daniel Rearden 6 年前

这个 graphql HOC只使用props——因为它实际上只是包装它所传递的组件,所以它不能访问该组件的状态。在HOC的配置中也没有异步获取数据的方法。

最简单的解决方案是将状态提升到现有的父组件中,或者提升到将包装现有组件的新组件中。例如:

class WrapperComponent extends Component {
  state = {
    userId: null,
  }

  async componentDidMount () {
    const data = await Auth.currentUserInfo()
    this.setState({ userId: data.attributes.sub})
  }

  render () {
    // May want to render nothing or a loading indicator if userId is null
    return <AllCardsScreen userId={this.state.userId} {...otherProps} />
  }
}

function authHOC(WrappedComponent) {
  return class AuthWrapper extends React.Component {
    state = {
      userId: null,
    }

    async componentDidMount () {
      const data = await Auth.currentUserInfo()
      this.setState({ userId: data.attributes.sub})
    }

    render () {
      return this.state.userId
        ? <WrappedComponent {...this.props} userId={this.state.userId} />
        : null
    }
  }
}