Module: Stannum::ParameterValidation::ClassMethods

Defined in:
lib/stannum/parameter_validation.rb

Overview

Defines a DSL for validating method parameters.

See Also:

Instance Method Summary collapse

Instance Method Details

#validate_parameters(method_name, &validations) ⇒ Object

Creates a validation contract and wraps the named method.

The provided block is used to create a ParametersContract, and supports the same DSL used to define one.

See Also:



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# File 'lib/stannum/parameter_validation.rb', line 120

def validate_parameters(method_name, &validations)
  method_name = method_name.intern
  contract    = Stannum::Contracts::ParametersContract.new(&validations)

  self::MethodValidations.add_contract(method_name, contract)

  self::MethodValidations.define_method(method_name) \
  do |*arguments, **keywords, &block|
    result = match_parameters_to_contract(
      arguments:   arguments,
      block:       block,
      contract:    contract,
      keywords:    keywords,
      method_name: method_name
    )

    return result unless result == VALIDATION_SUCCESS

    if keywords.empty?
      super(*arguments, &block)
    else
      super(*arguments, **keywords, &block)
    end
  end
end