创建自定义验证器 [英] Create custom Validator

问题描述

我应该如何创建并配置一个验证器类，以将其用作域类约束？例如：

  class链接{
字符串url 
静态约束= {url url：true} 
 
  

动机：Grails UrlValidator尽管不允许下划线它是有效的，请参阅 rfc2396，第2.3节。未保留字符。 验证器（作为静态属性）并将它们引用到相关的域类中。

  // src / groovy $ b $ class MyValidators {
 static urlCheck = {url，obj  - > 
 //自定义网址验证转到此处。 
} 
} 
 
 class链接{
字符串url 
静态约束= {
 url验证器：MyValidators.urlCheck 
} 
 
 
 
 $ b $ p 
 $ b如果不需要将验证程序外部化到单独的实用程序类，可以直接在domain类中使用验证器： 
 
 
  static constraints = {
 url验证器：{value，obj  - > ...} 
} 
  
 
How should I create and configure a validator class to use it as a domain class constraint? For example: 
class Link {
    String url
    static constraints = { url url:true }
}
Motivation: Grails UrlValidator does not allow underline character despite it being valid, see rfc2396, section 2.3. Unreserved Characters. 
解决方案
You can have a utility class in src/groovy with required validators (as static properties) and refer them in the concerned domain class.
//src/groovy
class MyValidators{
    static urlCheck = {url, obj ->
        //custom validation for url goes here.
    }
}

class Link {
    String url
    static constraints = { 
        url validator: MyValidators.urlCheck 
    }
}
If there is no need to externalize the validator to a separate utility class then you can directly use the validator in domain class as:
static constraints = {
    url validator: {value, obj -> ...} 
}


                        
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