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