this.setState没有重新呈现视图ReactJS和RubyonRails

我有一个rails应用程序，它有两个reactJS组件（不是父/子组件），目前正在通过全局事件Pub/Sub系统进行通信。

但是，当我运行this.setState({ items: this.props.items })时，我会收到消息Cannot read property 'items' of undefined。

如果人们能为我为什么会犯这个错误提供任何帮助，我们将不胜感激。

我的基本设置是：

BasketContainer-订阅了两个活动

class BasketContainer extends React.Component{
constructor() {
    super()
    this.state = {
        items: [],
        subTotal: 0,
        totalPrice: 0,
        deliveryPrice: 0
    }
}
componentWillMount() {
    this.setState( {
        items: this.props.items,
    })
}
componentDidMount() {
    this.token = PubSub.subscribe('ADD_BASKET', this.handleUpdate)
    this.token = PubSub.subscribe('REMOVE_ITEM', this.handleUpdate)
    this.calculateTotals();
}
componentWillUnmount() {
PubSub.unsubscribe(this.token)
}
handleUpdate(msg, data){
    console.log(msg)
    this.setState({
        items:this.props.items // ERROR MESSAGE - Cannot read property 'items' of undefined
    })
}
.... Rest of file

ProductItem-添加到购物篮事件发布服务器

class ProductItem extends React.Component{
constructor() {
    super()
    this.state = { 
        name: '',
        price: 0,
        code: '',
        id: ''
    }
}
componentWillMount() {
    this.setState({
        name: this.props.data.name,
        price: this.props.data.price,
        code: this.props.data.code,
        id: this.props.data.id
    })
}
addtoBasket() {
    $.ajax({
        type: "POST",
        url: "/items",
        dataType: "json",
        data: {
            item: {
                name: this.state.name,
                price: this.state.price,
                code: this.state.code
            }
        },
        success: function(data) {
            PubSub.publish('ADD_BASKET', data); // THIS WORKS FINE
            console.log("success");
        },
        error: function () {
            console.log("error");
        }
    })
}
render(){
    let productName = this.props.data.name
    let productPrice = this.props.data.price
    let productCode = this.props.data.code
    let productImg = this.props.data.image_url
    return (
        <div className="col-xs-12 col-sm-4 product">
            <img src={productImg}/>
            <h3 className="text-center">{productName}</h3>
            <h5 className="text-center">£{productPrice}</h5>
            <div className="text-center">
                <button onClick={this.addtoBasket.bind(this)} className="btn btn-primary">Add to Basket</button>
            </div>
        </div>
    )
}
}

BasketItem-从Basket Publisher中删除

class BasketItem extends React.Component{
constructor(props) {
    super()
    this.state = { 
        name: '',
        price: 0,
        code: '',
        id: '',
        quantity: 1,
    }
}
componentWillMount() {
    this.setState({
        name: this.props.data.name,
        price: this.props.data.price,
        code: this.props.data.code,
        id: this.props.data.id,
    })
}
deleteItem() {
    let finalUrl = '/items/' + this.state.id;
    $.ajax({
        type: "DELETE",
        url: finalUrl,
        dataType: "json",
        success: function(data) {
            PubSub.publish('REMOVE_ITEM', data); // THIS WORKS FINE
        },
        error: function () {
            console.log("error");
        }
    })
}   
render(){
    let itemName = this.props.data.name
    let itemCode = this.props.data.code
    let itemQuantity = 1
    let itemPrice = (this.props.data.price * itemQuantity).toFixed(2)
    const itemId = this.props.data.id
    return(
        <tr>
            <td>{itemName}</td>
            <td>{itemCode}</td>
            <td>{itemQuantity}</td>
            <td><button className="btn btn-warning" onClick={this.deleteItem.bind(this)}>Remove</button></td>
            <td>£{itemPrice}</td>
        </tr>
    )
}
}