Class: Aws::Templates::Utils::Parametrized::Transformation::AsObject

Inherits:
Aws::Templates::Utils::Parametrized::Transformation show all
Defined in:
lib/aws/templates/utils/parametrized/transformation/as_object.rb

Overview

Transform input value into the object

Input value can be either hash or object. The transformation performs nested object evaluation recusrsively as the input were Parametrized instance. As a parameter for the transformation you can specify either Module which mixes in Parametrized or to use a block which is to be evaluated as a part of Parametrized definition or both.

With as_object transformation you can have as many nested levels as it’s needed.

Example

class Piece
  include Aws::Templates::Utils::Parametrized

  parameter :param1,
    :transform => as_object(Aws::Templates::Utils::AsNamed)
  parameter :param2, :transform => as_object {
    parameter :id, :description => 'Just ID',
      :constraint => not_nil
  }
  parameter :param3,
    :transform => as_object(Aws::Templates::Utils::AsNamed) {
      parameter :path, :description => 'Just path',
        :constraint => not_nil
    }
end

i = Piece.new
i.param1 # => nil
i = Piece.new(:param1 => {:name => 'Zed'})
i.param1.name # => 'Zed'
i = Piece.new(:param2 => {:id => 123})
i.param2.id # => 123
i = Piece.new(:param3 => {:path => 'a/b', :name => 'Rex'})
i.param3.path # => 'a/b'
i.param3.name # => 123

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Aws::Templates::Utils::Parametrized::Transformation

#to_proc, #transform_wrapper

Constructor Details

#initialize(scope, klass = nil, &definition) ⇒ AsObject

Returns a new instance of AsObject.



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# File 'lib/aws/templates/utils/parametrized/transformation/as_object.rb', line 51

def initialize(scope, klass = nil, &definition)
  @klass = if klass.nil?
    Parametrized::Nested.create_class(scope)
  elsif klass.is_a?(Class)
    klass
  elsif klass.is_a?(Module)
    Parametrized::Nested.create_class(scope).with(klass)
  else
    raise "#{klass} is neither a class nor a module"
  end

  @klass.class_eval(&definition) unless definition.nil?
end

Instance Attribute Details

#klass ⇒ Object (readonly)

Returns the value of attribute klass.



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# File 'lib/aws/templates/utils/parametrized/transformation/as_object.rb', line 49

def klass
  @klass
end