Question

什么是每次操作中的获取请求失败/引发错误时仅调用一次changeIsSavedStatus（）的正确方法？

removeSavedDeals = () => {
    this.changeIsSavedStatus();

    //This Statement makes a fetch request and sets removeSelectedSavedDeals_ErrorStatus to true if error occurs
    this.props.removeSelectedSavedDeals([this.props.navigation.getParam("dealDetails")._id], this.props.savedDealsListDataSource);

    //This changeIsSavedStatus() statement does not gets executed as this.props.removeSelectedSavedDeals_ErrorStatus is still false when the if statement is executed.
    if(this.props.removeSelectedSavedDeals_ErrorStatus){
        changeIsSavedStatus();
    }
}

changeIsSavedStatus=()=>{
    this.setState({
        isSaved:!this.state.isSaved
    })
}

removeSelectedSavedDeals操作

export const removeSelectedSavedDeals = (dealIdToUnSave, dataSource) => dispatch => {
const toDelete = new Set(dealIdToUnSave);
const newDataSource = dataSource.filter(item => !toDelete.has(item._id));
//Send request to Backend to delete dealIdToUnSave from db
let url = sett.host+`/users/removeSavedDeals`;
return fetch(url, {
    method: 'POST',
    mode: 'cors',
    headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json',
    },
    body: JSON.stringify({
        dealIdToUnSave: dealIdToUnSave,
        savedDealsListDataSource: newDataSource
    }),
})
.then((res) => {
    if (!res.ok) {
        console.log("Fake Error");
        throw Error(res.statusText);
    }
    return res;
})
.then(res => {
    dispatch({
        type: "removeSelectedSavedDeals_Success",
        newDataSource
    })
})
.catch(err => {
    //TODO: Handle Error Properly
    console.log("Error Encountered While Unsaving Deals: "+ err);
    dispatch({
        type: "removeSelectedSavedDeals_Error",
        err
    })
});
}

P.S。还建议是否有任何方法可以改善我的removeSavedDeals（）

Answer 1

如果props.removeSelectedSavedDeals调用访存，它也应该返回一个承诺。然后，您可以{@ {1}}兑现承诺。

changeIsSavedStatus

每次操作中的获取请求失败/抛出错误时，仅一次调用changeIsSavedStatus（）的正确方法是什么？

1 个答案: