Each class

An annotation that checks every element of a list or set, or every value of a map, against constraints.

Use it for rules about the items rather than the collection: each answer non-blank, each score at least 0. Jakarta writes these on the type argument (List<@NotBlank String>); Dart has no annotations there. A null collection is skipped, and a value that is not a collection or map throws a ConstraintDeclarationException.

A list element is reported as answers[1].<list element> (field error on answers[1]), another iterable's as tags[].<iterable element>, and a map value as scores[math].<map value>. Use EachKey for map keys, and @Valid() to check the constraints inside element objects.

// Short, non-blank answers, and no negative scores.
@Introspected()
class Survey {
  @Each([NotBlank(), Size(max: 20)])
  List<String> answers = [];

  @Each([Min(0)])
  Map<String, int> scores = {};
}

Spring (Java):

class Survey {
  private List<@NotBlank @Size(max = 20) String> answers;
  private Map<String, @Min(0) Integer> scores;
}

Constructors

Each(List<Constraint> constraints)

Checks constraints on every element or map value.

const

Properties

constraints → List<Constraint>

The constraints each element must meet, such as [NotBlank(), Size(max: 20)].

final

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited