处理快递的错误响应

Question

我正在尝试从中发送错误响应并表达api调用，当用户添加非唯一类别或根本没有类别时，api调用会出错。我能够将类别保存到数据库并发送回适当的响应。我不确定我在快递中使用的是正确的回复方法。

表示：

exports.addCategory = (req, res, next) => {
  var category = new Category(req.body);
  category.save().then(doc => {
    res.send(doc);
  }).catch(err => {
    res.send({message:'Category must be unique!'});
  });

}

反应

export function addCategoryName( name ){
  return (dispatch) => {
    const dbPost = axios.post('/api/add-category', {name:name});
    dbPost.then(result => {
      console.log("result = ", result);
      dispatch({
        type: type.ADD_CATEGORY_NAME,
        payload: result.data
      });
    }).catch(err => {
      console.log("CATCH = ", err);
      // dispatch({
      //   type: type.ADD_CATEGORY_NAME_ERROR,
      //   payload: err.message
      // });
    });
  }
}

上面的响应直接进入dbPost.then（result => {而不是catch。所以我尝试了

Express response

res.status(err.statusCode || 500).json({message:msg});

This gave me:

CATCH =  Error: Request failed with status code 500
    at createError (createError.js:15)
    at settle (settle.js:18)
    at XMLHttpRequest.handleLoad (xhr.js:77)

All i'm trying to do is respond with an error message from express and for my axios promise to catch it as an error. But I can't seem to get to the error message. Is there something I'm missing in express as a response for this.

Answer 1

所以事实证明，这不是我的明确回应，而是我需要添加console.log（“ CATCH =”，err.response）;的事实。在我的axios中承诺会做出反应。我缺少响应对象。我不知道我需要那个。

对于完整的代码，以防其他人遇到相同的问题。

反应：

export function addCategoryName( name ){
  return (dispatch) => {
    const dbPost = axios.post('/api/add-category', {name:name});
    dbPost.then(result => {
      console.log("result = ", result);
      dispatch({
        type: type.ADD_CATEGORY_NAME,
        payload: result.data
      });
    }).catch(err => {
      console.log("CATCH = ", err.response);
       dispatch({
         type: type.ADD_CATEGORY_NAME_ERROR,
         payload: error.response.data.error
       });
    });
  }
}