如何使用 Sorbet 处理 nil 值的记忆？

Question

我有这个方法：

  def current_organization
    return @current_organization if defined?(@current_organization)

    subdomain = request.subdomain.to_s
    return @current_organization = nil if subdomain.blank?
    return @current_organization = nil if Allowable::DeniedSlugs.include?(subdomain)

    @current_organization = Organization.find_by(slug: subdomain)
  end

因为这个文件是 typed: strict，我需要声明 @current_organization，但这意味着检查 defined? 总是正确的。处理 nil 这样的方法的正确模式是什么

Answer 1

您必须在检查 defined? 之后声明 @current_organization，这可以在 find_by 调用

上方完成

def current_organization
  return @current_organization if defined?(@current_organization)

  ...

  @current_organization = T.let(@current_organization, T.nilable(Organization))
  @current_organization = Organization.find_by(slug: subdomain)
end

示例 sorbet.run

如何使用 Sorbet 处理 nil 值的记忆？

How to handle memoization with nil values with Sorbet?

ruby

sorbet