OnlyOneExistsRule

Validation rule that checks that only one property of a list of properties exists in an object.

Implements: IValidationRule

Description

The OnlyOneExistsRule allows you to check that only one property of a list of properties exists in an object.

Constructors

Creates a new validation rule and sets its values.

public constructor(…properties: string[])

  • properties: string[] - list of property names where only one property must exist

Instance methods

validate

Validates a given value against this rule.

public validate(path: string, schema: Schema, value: any, results: ValidationResult[]): void

  • path: string - dot notation path to the value.
  • schema: Schema - schema this rule is called from
  • value: any - value to be validated.
  • results: ValidationResult[] - list with validation results.

Examples

let schema = new Schema()
    .withRule(new 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

See also