Module: Kiba::Extend::Transforms::BooleanLambdaParamable

Included in:
Delete::FieldValueConditional, FilterRows::WithLambda, Marc::FilterRecords::WithLambda
Defined in:
lib/kiba/extend/transforms/boolean_lambda_paramable.rb

Overview

Mixin module for transform classes that require a Lambda parameter that must return TrueClass or FalseClass

Testing

This mixin’s funtionality is tested in Marc::FilterRecords::WithLambda and FilterRows::WithLambda. It is not imperative to test in in every additional transform class where it may be used.

Usage

In class definition:

include BooleanLambdaParamable

Any transform classes mixing in this module must have a @lambda instance variable on which is also set an attr_reader (private or public is ok)

Add the following line to the top of the process method if your lamba takes a single argument:

 test_lambda(row) unless lambda_tested

If your lambda takes multiple arguments, pass them in an Array in the test_lambda call:

 test_lambda([val, row]) unless lambda_tested

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(mod) ⇒ Object 



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# File 'lib/kiba/extend/transforms/boolean_lambda_paramable.rb', line 44

def self.included(mod)
  mod.instance_variable_set(:@lambda_tested, false)
end

Instance Method Details

#lambda_tested ⇒ Object 



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# File 'lib/kiba/extend/transforms/boolean_lambda_paramable.rb', line 48

def lambda_tested = @lambda_tested

#test_lambda(args) ⇒ Object 



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# File 'lib/kiba/extend/transforms/boolean_lambda_paramable.rb', line 50

def test_lambda(args)
  result = args.is_a?(Array) ? lambda.call(*args) : lambda.call(args)
  unless result.is_a?(TrueClass) || result.is_a?(FalseClass)
    fail(Kiba::Extend::BooleanReturningLambdaError)
  end

  @lambda_tested = true
end