访问容器中的reducer返回未定义

我只是想在我的React应用程序中集成一个新的容器,用Redux连接它,并希望看到一切正常工作。但事实并非如此。通过访问减速器 this.props.selection 给我 undefined .我不知道为什么。它可以在其他容器中工作,并且减速器有一些定义良好的初始状态。-我不确定这里有什么区别?我错过了什么小事吗?

import React, { Component } from 'react'
import { connect } from 'react-redux';
import {bindActionCreators} from 'redux';

export class AudioPlayer extends Component {
  constructor(props) {
    super(props);
    this.state = { someComponentState : true }
  }

  onLog() {
    console.log("Logging:");
    console.log(this.props.selection); // gives me: undefined
  }
  render() {    
    return (
      <div>
           <button onClick={()=> this.onLog()}>LOG</button>
      </div>
    )
  }
}

function mapStateToProps (state) {
  return {
    selection: state.selection
  };
}

export default connect(mapStateToProps)(AudioPlayer);

PS:我已经对这个组件进行了一些简化,但我认为它仍然应该反映出问题所在。

编辑:减速器示例 但是,有人要求查看Reducer,我尝试了使用几个Reducer,这些Reducer已经在应用程序中实现,并在其他容器中工作,所以我认为这不是问题所在,但谁知道呢:

import { SELECT_ITEM } from '../actions/types';

export default function(state = {}, action) {
  switch(action.type) {
    case SELECT_ITEM: 
      return {...state, error:'', selected: true};
  }

  return state;
}

edit2:似乎根本没有调用mapstatetoprops 我刚刚尝试在mapstatetoprops中做一个console.log,看看它是否被调用,似乎从来没有被调用过。没有任何记录。为什么会这样?

function mapStateToProps (state) {
    console.log("In map function");
    console.log(state);

  return {
    selection: state.selection, //both return
    auth: state.auth            // undefined
  };
}

我还添加了另一个reducer(auth),它在应用程序的其他地方工作,但这里返回未定义。

edit3:我的根减速器

import { combineReducers } from 'redux';
import { reducer as form } from 'redux-form';

//reducer imports
import authReducer from './auth_reducer';
import articlesReducer from './articles_reducer';
import userReducer from './user_reducer';
import currentSelectionReducer from './currentSelection_reducer';

const rootReducer = combineReducers({
  auth: authReducer,
  user: userReducer,
  articles: articlesReducer,
  selection: currentSelectionReducer,
});

export default rootReducer;