How do I translate validation errors in Go?

In Go, translating validation errors can be accomplished by using a custom error handling approach. Below is a simple example demonstrating how to define a validation error struct and translate it into user-friendly messages.


    package main

    import (
        "fmt"
        "errors"
    )

    // ValidationError represents a custom error type
    type ValidationError struct {
        Field string
        Msg   string
    }

    // Error implements the error interface for ValidationError
    func (ve *ValidationError) Error() string {
        return fmt.Sprintf("Field '%s': %s", ve.Field, ve.Msg)
    }

    // TranslateValidationError translates a validation error into a user-friendly message
    func TranslateValidationError(err error) string {
        if ve, ok := err.(*ValidationError); ok {
            switch ve.Field {
            case "username":
                return "Username must be at least 3 characters long."
            case "email":
                return "Please provide a valid email address."
            default:
                return "Invalid input for the field."
            }
        }
        return "Unknown error occurred."
    }

    func main() {
        // Simulating a validation error
        err := &ValidationError{Field: "username", Msg: "too short"}
        // Translating the error message
        friendlyMessage := TranslateValidationError(err)
        fmt.Println(friendlyMessage) // Outputs: Username must be at least 3 characters long.
    }

How do I translate validation errors in Go?

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How do I translate validation errors in Go?

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