reactjs – 如何在Redux中为每个实例创建一个商店？

2023年3月23日 239次阅读

有时,在Redux应用程序中为每个实例创建一个商店会很有用. Redux的创建者自己创建了一个Gist,描述了如何实现这个目标：
https://gist.github.com/gaearon/eeee2f619620ab7b55673a4ee2bf8400

我已经在Gist中提出了这个问题,但我认为StackOverflow对于这个问题来说会更好：

我想知道如何将操作分派给组件自己的特殊商店？有没有办法访问< Provider />的store-prop.对于每个< SubApp /> (和他们的孩子组成部分)？

例如：我有一些API类在从远程服务器获取数据后调用dispatch.但由于我无法导入“普通”商店,处理自定义商店以使其可用于其他类/文件/服务的最佳方式是什么？

更新1

所以我得到了它的工作,但我认为这是一种非常肮脏的方式(请注意UGLY？代码中的注释)：

提供者：

通过在构造函数中创建商店来为每个实例创建一个商店：

export default class OffersGridProvider extends React.Component {
  constructor(props) {
    super(props)
    this.store = createStore(reducers);
  }

  render() {
    return (
      <Provider store={this.store}>
        <OffersGridContainer offers={this.props.offers} />
      </Provider>
    );
  }
}

容器：

提供者将此商店的调度方法注入我的OffersGridContainer,我可以使用该方法将操作分派给此实例的商店：

class OffersGridContainer extends React.Component {    
  componentDidMount() {

    // UGLY???
    const { dispatch } = this.props;

    let destinationIds = [];
    this.props.offers.forEach((offer) => {
      offer.to.forEach((destination) => {
        destinationIds.push(destination.destination);
      });
    });

    // MORE UGLY???
    destinationsApi.getDestinations(dispatch, destinationIds);
  }

  render() {
    return (
      <OffersGridLayout destinations={this.props.destinations} />
    );
  }
}

const mapStateToProps = function(store) {
  return {
    destinations: store.offersGridState.destinations
  };
}

export default connect(mapStateToProps)(OffersGridContainer);

API方法：

只需使用我作为参数传递给我的API方法的dispatch方法：

export function getDestinations(dispatch, ids) {
  const url = $('meta[name="site-url"]').attr('content');

  const filter = ids.map((id) => {
    return `filter[post__in][]=${id}`;
  }).join('&');

  return axios.get(`${url}/wp-json/wp/v2/destinations?filter[posts_per_page]=-1&${filter}`)
    .then(response => {
      dispatch(getOffersGridSuccess(response.data));
      return response;
    });
}

更新2

刚收到评论中关于mapDispatchToProps的提示,所以我的Container现在看起来像这样：

class OffersGridContainer extends React.Component {    
  componentDidMount() {
    let destinationIds = [];

    this.props.offers.forEach((offer) => {
      offer.to.forEach((destination) => {
        destinationIds.push(destination.destination);
      });
    });

    this.props.getDestinations(destinationIds);
  }

  render() {
    return (
      <OffersGridLayout destinations={this.props.destinations} />
    );
  }
}

const mapStateToProps = function(store) {
  return {
    destinations: store.offersGridState.destinations
  };
}

const mapDispatchToProps = function(dispatch) {
  return {
    getDestinations: function(ids) {
      return destinationsApi.getDestinations(dispatch, ids);
    }
  }
}

export default connect(mapStateToProps, mapDispatchToProps)(OffersGridContainer);

更新3(最终答案)

现在一切正常！这是代码：

提供者：

export default class OffersGridProvider extends React.Component {    
  constructor(props) {
    super(props)
    this.store = createStore(reducers, applyMiddleware(thunk));
  }

  render() {
    return (
      <Provider store={this.store}>
        <OffersGridContainer offers={this.props.offers} />
      </Provider>
    );
  }
}

容器：

class OffersGridContainer extends React.Component {
  componentDidMount() {
    const destinationIds = this.props.offers.reduce((acc, offer) => {
      return [...acc, ...offer.to.map(d => d.destination)];
    }, []);

    this.props.getDestinations(destinationIds);
  }

  render() {
    return (
      <OffersGridLayout destinations={this.props.destinations} />
    );
  }
}

const mapStateToProps = function(store) {
  return {
    destinations: store.offersGridState.destinations
  };
}

const mapDispatchToProps = function(dispatch) {
  return {
    getDestinations: function(ids) {
      return dispatch(destinationsApi.getDestinations(ids));
    }
  }
}

export default connect(mapStateToProps, mapDispatchToProps)(OffersGridContainer);

API方法：

export function getDestinations(ids) {
  return function(dispatch) {
    const url = $('meta[name="site-url"]').attr('content');

    const filter = ids.map((id) => {
      return `filter[post__in][]=${id}`;
    }).join('&');

    return axios.get(`${url}/wp-json/wp/v2/destinations?filter[posts_per_page]=-1&${filter}`)
      .then(response => {
        return dispatch(getOffersGridSuccess(response.data));
      });
  }
}

最佳答案 我建议你使用redux-thunk包而不是直接在组件中调用api.

接下来,您应该将mapDispatchToProps函数作为第二个参数传递给connect函数,以将action creator函数注入组件：

import { getDestinations } from '../actions';

class OffersGridContainer extends React.Component {    
  componentDidMount() {
    // Tip.
    const destinationIds = this.props.offers.reduce((acc, offer) => {
      return [...acc, ...offer.to.map(d => d.destination)];
    }, []);

    // instead `destinationsApi.getDestinations(dispatch, destinationIds)`
    // call action creator function
    this.props.getDestinations(destinationIds);
  }

  render() {
    return (
      <OffersGridLayout destinations={this.props.destinations} />
    );
  }
}

const mapStateToProps = function(store) {
  return {
    destinations: store.offersGridState.destinations
  };
}

const mapDispatchToProps = function(dispatch) {
  return {
    // this function will be available in component as   
    // `this.props.getDestinations`.
    getDestinations: function(destinationIds) {
      dispatch(getDestinations(destinationIds));
    }
  };
}

export default connect(mapStateToProps, mapDispatchToProps)(OffersGridContainer);
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