module ActionView::Helpers::InstanceTagMethods::ClassMethods

def check_box_checked?(value, checked_value)
  case value
  when TrueClass, FalseClass
    value
  when NilClass
    false
  when Integer
    value != 0
  when String
    value == checked_value
  when Array
    value.include?(checked_value)
  else
    value.to_i != 0
  end
end

def radio_button_checked?(value, checked_value)
  value.to_s == checked_value.to_s
end

def value(object, method_name)
  object.send method_name unless object.nil?
end

def value_before_type_cast(object, method_name)
  unless object.nil?
    object.respond_to?(method_name + "_before_type_cast") ?
    object.send(method_name + "_before_type_cast") :
    object.send(method_name)
  end
end