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Categories
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- Constraints
-The validation is designed to validate data against constraints.
-Import -
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-import (
- "gitnet.fr/deblan/go-form/validation"
-)
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-Constraints -
Length -
Validate the length of an array, a slice or a string
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-c := validation.NewLength()
-
-// Define minimum
-c.WithMin(1)
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-// Define minimum
-c.WithMax(100)
-
-// Define min and max
-// Equivalent to c.WithMin(50).WithMax(50)
-c.WithExact(50)
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-Mail -
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-validation.NewMail()
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-Not blank -
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-validation.NewNotBlank()
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-Range -
Validate a number
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-c := validation.NewRange()
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-// Define minimum
-c.WithMin(1)
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-// Define minimum
-c.WithMax(100)
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-// Define min and max
-// Equivalent to c.WithMin(1).WithMax(100)
-c.WithRange(1, 100)
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-Regex -
Validate a string with a regex
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-c := validation.NewRegex(`expression`)
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-// The value must match
-c.MustMatch()
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-// The value must not match
-c.MustNotMatch()
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-Is even -
Validate that a number is even.
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-validation.NewIsEven()
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-Is odd -
Validate that a number is odd.
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-validation.NewIsOdd()
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-Custom constraint -
Use case: you want to validate that the data equals “example”
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- package validation
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-import (
- "reflect"
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- v "gitnet.fr/deblan/go-form/validation"
-)
-
-// Define a struct
-type IsExample struct {
- Message string
- TypeErrorMessage string
-}
-
-// Create a factory
-func NewIsExample() IsEven {
- return IsEven{
- Message: "This value does not equal \"example\".",
- TypeErrorMessage: "This value can not be processed.",
- }
-}
-
-// Implement the validation
-func (c IsExample) Validate(data any) []Error {
- errors := []Error{}
-
- // Should not validate blank data
- if len(v.NewNotBlank().Validate(data)) != 0 {
- return []Error{}
- }
-
- t := reflect.TypeOf(data)
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- if t.Kind() == reflect.Ptr {
- t = t.Elem()
- }
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- switch t.Kind() {
- case reflect.String:
- if data.(string) != "example" {
- errors = append(errors, Error(c.Message))
- }
-
- default:
- errors = append(errors, Error(c.TypeErrorMessage))
- }
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- return errors
-}
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