def render *args
# 包含 namespace 判斷
# EX1: PostsController#press => meta_for_posts_press
# EX2: Admin::FlagsController#show => meta_for_admin_flags_show
method_name = "meta_for_#{controller_path.underscore.gsub(/\//, '_')}_#{action_name}"
meta_data = self.respond_to?(method_name) ? send(method_name) : meta_for_default
set_meta(meta_data)
super
end
https://github.com/5fpro/election2016-official/blob/develop/app/lib/meta_context.rb#L4