在哪里可以存储映射方法?

begin
  case "my hash's use" do
    when "it's for display" then
      if "it's a small method"
        "put it in a helper for use a controller"
      else
        "put it in a module and include it using via `helper`"
      end
    when "it's not for display" then "put it in a helper for use in a route block"
  else
    "it should go in the class that requires it."
  end

rescue NoMethodError => e
  e.message = <<~MESSAGE
    If it doesn't work because the logic isn't defined
    in your views or route blocks then it should go in 
    the class that requires it."
  MESSAGE
ensure
  "I get out more so I stop answering this question in Ruby ;-)"
end

换句话说,把它放在助手中,然后你可以稍后评估它是否应该去其他地方。

不管怎样,@tadman将该示例散列声明为常量是正确的,您应该像对待任何其他常量一样对待对该示例散列的访问-如果您在多个位置需要它,那么就让它位于命名空间层次结构的上一级。如果是大量数据,@Stefan说从其他地方加载数据是正确的。