OnlyOneExistsRule class

Validation rule that check that at exactly one of the object properties is not null.

See IValidationRule

Example

var schema =  Schema()
    .withRule( OnlyOneExistsRule('field1', 'field2'));

schema.validate({ field1: 1, field2: 'A' });     // Result: only one of properties field1, field2 must exist
schema.validate({ field1: 1 });                  // Result: no errors
schema.validate({ });                            // Result: only one of properties field1, field2 must exist

Implemented types

• IValidationRule

Constructors

OnlyOneExistsRule(List<String> properties)

Creates a new validation rule and sets its values

Properties

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

validate(String? path, Schema schema, dynamic value, List<ValidationResult> results) → void

Validates a given value against this rule.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited