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go-playground/validator(validator.v9) で struct の tag情報を取得する
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package main | |
import ( | |
"fmt" | |
"gopkg.in/go-playground/validator.v9" | |
"reflect" | |
"strings" | |
) | |
type User struct { | |
Name string `json:"name" validate:"required"` | |
Email string `json:"email" validate:"required,email"` | |
} | |
type ValidationError struct { | |
Field string `json:"field"` | |
} | |
func NewValidator() *validator.Validate { | |
validate := validator.New() | |
validate.RegisterTagNameFunc(func(fld reflect.StructField) string { | |
name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0] | |
if name == "-" { | |
return "" | |
} | |
return name | |
}) | |
return validate | |
} | |
func ValidationErrorHandler(err error) (errorFields []ValidationError) { | |
errors := err.(validator.ValidationErrors) | |
errorFields = make([]ValidationError, len(errors)) | |
for i, err := range errors { | |
errorFields[i] = ValidationError{ | |
err.Field(), | |
} | |
} | |
return | |
} | |
func main() { | |
p := &User{"Bob", "InvalidEmail"} | |
v := NewValidator() | |
if err := v.Struct(p); err != nil { | |
invalidTagName := ValidationErrorHandler(err) | |
fmt.Printf("%s is Invalid: ", invalidTagName) | |
} | |
} |
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