我正在使用react-router v4和redux-
saga。我正在尝试在页面加载时进行API调用。当我访问时/detailpage/slug/，我的应用程序似乎陷入了循环并无休止地调用了我的API端点。这是我的应用程序的设置方法。假设我的进口是正确的。

index.js

const history = createHistory()
const sagaMiddleware = createSagaMiddleware()
const middleware = [routerMiddleware(history), sagaMiddleware]

const store = createStore(
  combineReducers({
    aReducer
  }),
  applyMiddleware(...middleware)
)

injectTapEventPlugin();
sagaMiddleware.run(rootSaga)


ReactDOM.render(
  <Provider store={store}>
  <ConnectedRouter history={history}>
    <Switch>
      <Route path="/" exact component={HomePage} />
      <Route path="/detailpage/:slug" component={Detail} />
      <Route path="/page" component={Page} />
    </Switch>
  </ConnectedRouter>
  </Provider>,
  document.getElementById('root')
);

reducers / index.js

const aReducer = (state={}, action) => {
  switch(action.type) {
    case 'SHOW_DETAIL':
    console.log('Reducers: reducer called')
    return Object.assign({}, state, { name: 'adfsdf' })
  default:
    return state;
  }
}
export default aReducer;

动作/ index.js

export const showDetailInfo = () => {
  console.log('action called')
  return {
    type: 'SHOW_DETAIL'
  }
}

saga.js

export function* fetchDetailsAsync() {
  try {
    console.log('fetching detail info')
    const response = yield call(fetch, 'http://localhost:8000/object/1/', {
    method: 'GET',
    headers: {
      'Authorization': 'Token xxxxxxxxxxxx'
    }})

    console.log(response);

    yield put({type: 'SHOW_DETAIL', response: response.data})
  } catch (e) {
    console.log('error')
  }
}

// watcher saga
export function* fetchDetails() {
  console.log('watcher saga')
  yield takeEvery('SHOW_DETAIL', fetchDetailsAsync)
}

export default function* rootSaga() {
  console.log('root saga')
  yield [
    fetchDetails()
  ]
}

容器/Detail.js

const mapStateToProps = (state) => {
  return {
    name: 'Test'
  }
}

const mapDispatchToProps = (dispatch, ownProps) => {
  console.log('mapDispatchToProps')
  return {
    showDetailInfo: (payload) => {
      console.log('dispatching');
      dispatch({ type: 'SHOW_DETAIL' })
    }
  }
}

const Detail = connect(
  mapStateToProps,
  mapDispatchToProps
)(DetailPage)

export default Detail;

组件/DetailPage.js

class DetailPage extends React.Component {

  componentWillMount() {
    this.props.showDetailInfo();
  }

  render() {
    return (
      <Layout>
      <h3>DetailPage</h3>
      <p>{ this.props.name }</p>
      </Layout>
    )
  }
}

DetailPage.PropTypes = {
  showDetailInfo: PropTypes.func.isRequired,
  name: PropTypes.string.isRequired
}

export default DetailPage;

我花了几天的时间进行故障排除，尝试各种想法，包括测试不同的生命周期方法，从applyMiddleware中删除routerMiddleware。

我以为我的组件在每个API调用之后都会更新，但是任何生命周期方法中的console.log都没有更新。

作为对生态系统做出反应的新手，这里有很多活动部件，这对我来说很难进行故障排除。