Chain<T, E> class

Chains validators sequentially, only proceeding if the previous passes.

Unlike AllOf, this is for dependent validations where later validators should only run if earlier ones pass.

final validator = Chain<String, String>([
  requiredRule,
  emailFormatRule,
  uniqueEmailRule, // Only runs if format is valid
]);
Inheritance
Available extensions

Constructors

Chain(List<Formix<T, E>> validators)
Creates a Chain validator from a list of validators.
const

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
validators → List<Formix<T, E>>
The list of validators to chain sequentially.
final

Methods

andThen(Formix<T, E> next) → Formix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Chains this validator with next, running next only if this passes.
cached() → CachedFormix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Wraps this validator with single-value caching.
lazy() → LazyFormix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Creates a lazy validator that defers instantiation until first use.
lruCached({int maxSize = 10}) → LruCachedFormix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Wraps this validator with LRU (Least Recently Used) caching.
mapError<E2>(E2 mapper(E error)) → Formix<T, E2>

Available on Formix<T, E>, provided by the FormixExtensions extension

Maps errors from type E to type E2.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
optional({bool isEmpty(T value)?}) → Formix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Makes this validator optional - skips validation when empty.
recover(T onError(List<E> errors)) → Formix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Recovers from validation errors with a default value.
tap({void onValid(T value)?, void onInvalid(List<E> errors)?}) → Formix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Applies side effects without affecting validation.
toString() → String
A string representation of this object.
inherited
validate(T value) → ValidationResult<T, E>
Validates value and returns a ValidationResult.
override
when(bool condition(T value)) → Formix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Conditionally applies this validator based on condition.
whenNot(bool condition(T value)) → Formix<T, E>

Available on Formix<T, E>, provided by the FormixExtensions extension

Conditionally skips this validator based on condition.
withMessageFormatter(ErrorMessageFormatter<E> formatter) → Formix<T, String>

Available on Formix<T, E>, provided by the FormixExtensions extension

Maps errors to user-facing messages using formatter.

Operators

operator ==(Object other) → bool
The equality operator.
inherited