Method: ModelPack::ClassMethods#attribute_reader

Defined in:

lib/model_pack/class_methods.rb

#attribute_reader(name, default: nil, as: nil, serialize: nil, predicate: nil) ⇒ Object

# File 'lib/model_pack/class_methods.rb', line 16

def attribute_reader(name, default: nil, as: nil, serialize: nil, predicate: nil)
  dv = default.dup rescue default

  define_method name do
    instance_variable_defined?("@#{name}") ?
      instance_variable_get("@#{name}") : instance_variable_set("@#{name}", (as ? as.new : (dv.is_a?(Proc) ? dv.call : dv )))
  end

  # define predicate method if required
  define_method "#{name}?" do
    value = (instance_variable_defined?("@#{name}") ?
      instance_variable_get("@#{name}") : instance_variable_set("@#{name}", (as ? as.new : (dv.is_a?(Proc) ? dv.call : dv ))))
    predicate.is_a?(Proc) ? predicate.call(value)  : !!value  # false for nil or false
  end if predicate

  define_method "#{name}_hash" do
    instance_exec(send(name), &serialize)
  end if serialize
end