niki/vendor/github.com/go-ozzo/ozzo-validation/UPGRADE.md

Upgrade Instructions

Upgrade from 2.x to 3.x

• Instead of using StructRules to define struct validation rules, use ValidateStruct() to declare and perform struct validation. The following code snippet shows how to modify your code:

// 2.x usage
err := validation.StructRules{}.
	Add("Street", validation.Required, validation.Length(5, 50)).
	Add("City", validation.Required, validation.Length(5, 50)).
	Add("State", validation.Required, validation.Match(regexp.MustCompile("^[A-Z]{2}$"))).
	Add("Zip", validation.Required, validation.Match(regexp.MustCompile("^[0-9]{5}$"))).
	Validate(a)

// 3.x usage
err := validation.ValidateStruct(&a,
	validation.Field(&a.Street, validation.Required, validation.Length(5, 50)),
	validation.Field(&a.City, validation.Required, validation.Length(5, 50)),
	validation.Field(&a.State, validation.Required, validation.Match(regexp.MustCompile("^[A-Z]{2}$"))),
	validation.Field(&a.Zip, validation.Required, validation.Match(regexp.MustCompile("^[0-9]{5}$"))),
)

• Instead of using Rules to declare a rule list and use it to validate a value, call Validate() with the rules directly.

data := "example"

// 2.x usage
rules := validation.Rules{
	validation.Required,      
	validation.Length(5, 100),
	is.URL,                   
}
err := rules.Validate(data)

// 3.x usage
err := validation.Validate(data,
	validation.Required,      
	validation.Length(5, 100),
	is.URL,                   
)

• The default struct tags used for determining error keys is changed from validation to json. You may modify validation.ErrorTag to change it back.