2019-02-07 09:50
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I have an application written with golang gin framework. I want to write a middleware to customize all error messages specially in the case of BindJSON.

Here is the middleware:

func Errors() gin.HandlerFunc {
    return func(c *gin.Context) {
        // Only run if there are some errors to handle
        if len(c.Errors) > 0 {
            for _, e := range c.Errors {
                // Find out what type of error it is
                switch e.Type {
                case gin.ErrorTypePublic:
                    // Only output public errors if nothing has been written yet
                    if !c.Writer.Written() {
                        c.JSON(c.Writer.Status(), gin.H{"Error": e.Error()})
                case gin.ErrorTypeBind:
                    errs := e.Err.(validator.ValidationErrors)
                    list := make(map[int]string)

                    for field, err := range errs {
                        list[field] = validationErrorToText(err)
                    // Make sure we maintain the preset response status
                    status := http.StatusBadRequest
                    if c.Writer.Status() != http.StatusOK {
                        status = c.Writer.Status()
                    c.JSON(status, gin.H{"Errors": list})

                    c.JSON(http.StatusBadRequest, gin.H{"Errors": c.Errors.JSON()})

            // If there was no public or bind error, display default 500 message
            if !c.Writer.Written() {
                c.JSON(http.StatusInternalServerError, gin.H{"Error": errorInternalError.Error()})

The functionality is so simple, it gets all the gin errors and do something based on error type! the problem is in case of gin.ErrorTypeBind when i've tried to map errors to validation errors: e.Err.(validator.ValidationErrors). I've got this error

interface conversion: error is validator.ValidationErrors, not validator.ValidationErrors (types from different packages)

here is the list of imported packages:

import (

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1条回答 默认 最新

  • douzhengnao8265 2019-02-07 18:47

    Looking at the source code of gin I am seeing this:

    import (

    but you are using ""

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