forked from ebhomengo/niki
64 lines
2.4 KiB
Markdown
64 lines
2.4 KiB
Markdown
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# Upgrade Instructions
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## Upgrade from 3.x to 4.x
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If you are customizing the error messages of the following built-in validation rules, you may need to
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change the parameter placeholders from `%v` to the Go template variable placeholders.
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* `Length`: use `{{.min}}` and `{{.max}}` in the error message to refer to the minimum and maximum lengths.
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* `Min`: use `{{.threshold}}` in the error message to refer to the lower bound.
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* `Max`: use `{{.threshold}}` in the error message to refer to the upper bound
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* `MultipleOf`: use `{{.base}}` in the error message to refer to the base of the multiples.
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For example,
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```go
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// 3.x
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lengthRule := validation.Length(2,10).Error("the length must be between %v and %v")
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// 4.x
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lengthRule := validation.Length(2,10).Error("the length must be between {{.min}} and {{.max}}")
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```
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## Upgrade from 2.x to 3.x
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* Instead of using `StructRules` to define struct validation rules, use `ValidateStruct()` to declare and perform
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struct validation. The following code snippet shows how to modify your code:
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```go
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// 2.x usage
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err := validation.StructRules{}.
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Add("Street", validation.Required, validation.Length(5, 50)).
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Add("City", validation.Required, validation.Length(5, 50)).
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Add("State", validation.Required, validation.Match(regexp.MustCompile("^[A-Z]{2}$"))).
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Add("Zip", validation.Required, validation.Match(regexp.MustCompile("^[0-9]{5}$"))).
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Validate(a)
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// 3.x usage
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err := validation.ValidateStruct(&a,
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validation.Field(&a.Street, validation.Required, validation.Length(5, 50)),
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validation.Field(&a.City, validation.Required, validation.Length(5, 50)),
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validation.Field(&a.State, validation.Required, validation.Match(regexp.MustCompile("^[A-Z]{2}$"))),
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validation.Field(&a.Zip, validation.Required, validation.Match(regexp.MustCompile("^[0-9]{5}$"))),
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)
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```
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* Instead of using `Rules` to declare a rule list and use it to validate a value, call `Validate()` with the rules directly.
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```go
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data := "example"
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// 2.x usage
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rules := validation.Rules{
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validation.Required,
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validation.Length(5, 100),
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is.URL,
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}
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err := rules.Validate(data)
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// 3.x usage
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err := validation.Validate(data,
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validation.Required,
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validation.Length(5, 100),
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is.URL,
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)
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```
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* The default struct tags used for determining error keys is changed from `validation` to `json`. You may modify
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`validation.ErrorTag` to change it back.
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