英文:
Form input Validation in Revel
问题
我正在学习Revel，并使用Validation包对输入进行一些检查。
我想要检查数据库中是否已经存在一个带有"name"的记录（我通过表单从用户那里获取输入），如果存在则返回错误，否则创建一条记录。我能够使用内置的方法（如Required、Maxlen...）验证字段并在HTML中显示错误。但是对于我的自定义检查，我应该将自定义验证器添加到Validation包中，还是有其他方法可以向验证上下文中添加自定义键和错误信息？我找不到如何向错误映射中添加自定义键和消息的方法。谢谢。
英文:
Im learning Revel and using the Validation package to do some checks on input.
I want to see if there already exists a record with a "name" in DB (i get a input from user through a form) and if true return error else create a record. Im am able to validate (with built in methods like Required, Maxlen ...) a field and display the error in HTML. But for my custom check Is adding a custom Validator to the Validation package the way to go or is there a way i can add custom keys and error to the Validation Context. I couldnt find how i can added custom keys and message to the error map. Thanks.
答案1
得分: 2
revel的validators.Validator接口如下所示：
type Validator interface {IsSatisfied(interface{}) boolDefaultMessage() string}
而*validation.Validation有一个方法：
func (v *Validation) Check(obj interface{}, checks ...Validator) *ValidationResult
而*validation.ValidationResult有一个方法：
func (*ValidationResult) Message
将它们整合在一起：
type usernameChecker struct {}func(u usernameChecker) IsSatisified(i interface{}) bool {s, k := i.(string)if !k {return false}/* 检查 s 是否存在于数据库中 */}func(u usernameChecker) DefaultMessage() string {return "用户名已被使用"}在你的应用程序中：```gofunc (c MyApp) SaveUser(username string) revel.Result {c.Validation.Check(username, usernameChecker{}).Message("在失败的情况下更具体或翻译的消息")}
这是我见过的最糟糕的验证库之一。
英文:
revel's validators.Validator interface looks like this:
type Validator interface {IsSatisfied(interface{}) boolDefaultMessage() string}
And *validation.Validation has a method:
func (v *Validation) Check(obj interface{}, checks ...Validator) *ValidationResult
And *validation.ValidationResult has a method:
func (*ValidationResult) Message
Putting that all together:
type usernameChecker struct {}func(u usernameChecker) IsSatisified(i interface{}) bool {s, k := i.(string)if !k {return false}/* check if s exists in DB */}func(u usernameChecker) DefaultMessage() string {return "username already in use"}
And in your application:
func (c MyApp) SaveUser(username string) revel.Result {c.Validation.Check(username, usernameChecker{}).Message("more specific or translated message in case of failure")}
This is one if not the most badly designed validation library I have ever seen.
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