v0.19.0

What's Changed

Added

• Slice validation: Slice, SliceProperty, Each, and EachProperty for validating slices with per-element constraints.
• HasUniqueValuesBy: Constraint to ensure slice elements are unique by a key function.
• Validate method on constraints: Constraints can now be used directly with Each and This.

Changed

• Validator initialization: Global validator replaced with atomic pointer for thread-safe usage. Use new validator setup methods in tests.
• CheckNoViolations: Now accepts variadic errors for improved error handling and termination conditions.
• Documentation: README restructured with installation, custom constraints, and property paths; expanded custom constraints guide with interface details and examples.
• Skill docs: SKILLS.md removed; new reference and skill documentation for adding validation constraints.

Fixed

• Correct handling of single violations returned from validatable objects in validateIt.

Breaking Changes

• Tests using CheckNoViolations or validator setup need to be updated to the new signatures and helpers.

Full Changelog: v0.18.0...v0.19.0

v0.18.0

What's Changed

New

• UnwrapViolations(err) — Single function to unwrap both a single Violation and ViolationList from an error. Use this instead of UnwrapViolation and UnwrapViolationList.
• ViolationList.All() — Iterator over violations for range loops: for i, v := range violations.All() { ... }
• PropertyPath.All() — Iterator over property path elements for range loops

Deprecated

• UnwrapViolation and UnwrapViolationList — Use UnwrapViolations instead.

Requirements

• Go 1.24 or later

Full Changelog: v0.17.0...v0.18.0

v0.17.0

What's Changed

• docs updated by @strider2038 in #77
• ULID validation by @strider2038 in #78
• UUID validation by @strider2038 in #79
• divisible by validation by @strider2038 in #80
• feature: at property by @strider2038 in #81
• bump golang x text dependency by @strider2038 in #82

Full Changelog: v0.16.0...v0.17.0

v0.16.0

• BC break stored constraints removed
• BC break ip testing function signature updated to return error instead of bool
• Instance() function in validator package

Full Changelog: v0.15.0...v0.16.0

v0.15.0

• validation.ValidatableFunc added as a functional adapter for validation.Validatable interface
• validation.BuiltinViolationFactory is now exported and can be reused
• few code examples added for some complex cases

v0.14.0

• Feature: it.DateTimeConstraint to validate date time values
• Feature: marshal complex property path values into string
• Feature: property path unmarshaling from string
• Feature: new methods for validation.PropertyPath:
  • method Elements() returns property path as slice of PropertyPathElement
  • method Len() returns length of the property path
• Feature: additional checks for it.URLConstraint:
  • WithHosts to check list of allowed hosts
  • WithHostMatches to check host by regexp pattern
  • WithRestriction to check by closure
• breaking changes in packages is and validate:
  • validate.URL(value string, schemas ...string) error signature replaced by validate.URL(value string, restrictions ...URLRestriction) error
  • is.URL(value string, schemas ...string) error signature replaced by is.URL(value string, restrictions ...URLRestriction) error

v0.13.2

fix: revert behaviour for it.ChoiceConstraint (method WithAllowedBlank replaced by WithoutBlank)

v0.13.1

• violations formatting updated
• more detailed assertion errors for violation assertions

v0.13.0

• big refactoring with breaking changes
• validation codes replaced by static errors
  • validation.Error added with constructor validation.NewError()
  • Violation.Code() string replaced by Violation.Unwrap() error method
  • package code removed
  • all Violation implementations can now be tested by standard errors.Is() function for containing static errors
• most of constraint method names now are suffixed with With
• it.IsEqualToString, it.IsNotEqualToString, it.IsEqualToNumber, it.IsNotEqualToNumber removed
• validation.ViolationList.Each() renamed to validation.ViolationList.ForEach()
• validation.ViolationList.Has() replaced by validation.ViolationList.Is()
• signatures for all constraints updated from Validate<Type>(value, scope) to Validate<Type>(ctx, validator, value)
• validation.Scope removed (all exported methods moved to validation.Validator)
• validation.NewTypedArgument() renamed to validation.This()
• validation.CustomStringConstraint renamed to validation.StringFuncConstraint
• validation.NewCustomStringConstraint() renamed to validation.OfStringBy()
• validation.Language argument removed
• validation.Option and all implementations removed
• argument With with Option method replaced by At method with property path
• validation.PropertyNameElement renamed to validation.PropertyName
• validation.ArrayIndexElement renamed to validation.ArrayIndex
• it.NotBlankConstraint.AllowNil() renamed to it.NotBlankConstraint.WithAllowedNil()
• it.ChoiceConstraint blank value behaviour updated (additional method WithAllowedBlank() added)
• all previous deprecations removed

See all updates in pull request #74

v0.12.0

• Feature: Generic Constraint interface and NewTypedArgument constructor.
• Feature: AllArgument for composing a complex validation.
• Feature: AsyncArgument for asynchronous validation.
• Fixed: All error methods now have pointer receivers.