Named_scope 重构为 rails 4

Named_scope refactoring to rails 4

我有named_scope :business, :conditions => "processing_time_15_minutes is null"

如何重构为 rails4 风格

感谢

给你:

scope :business, -> { where(processing_time_15_minutes: nil) }
scope :business, -> { where(processing_time_15_minutes: nil) }