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The above example performs a validation using the built-in validator “InclusionIn”. It checks the value of the field “type” in a domain list. If the value is not included in the method then the validator will fail and return false. The following built-in validators are available:
| Name | Explanation | Example |
|---|---|---|
| PresenceOf | Validates that a field’s value isn’t null or empty string. This validator is automatically added based on the attributes marked as not null on the mapped table | Example |
| Validates that field contains a valid email format | Example | |
| ExclusionIn | Validates that a value is not within a list of possible values | Example |
| InclusionIn | Validates that a value is within a list of possible values | Example |
| Numericality | Validates that a field has a numeric format | Example |
| Regex | Validates that the value of a field matches a regular expression | Example |
| Uniqueness | Validates that a field or a combination of a set of fields are not present more than once in the existing records of the related table | Example |
| StringLength | Validates the length of a string | Example |
| Url | Validates that a value has a valid URL format | Example |
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原文地址：http://www.cnblogs.com/achengmu/p/5879738.html
