字段多状态

Before

classPhoto<ActiveRecord::Base 
    STATUSES =['queued','new','changed','removed','ready']
    def change_status
        self.status ='changed'

    end

end

 

then

classPhoto<ActiveRecord::Base 
    STATUSES ={queued:'queued',new:'new', changed:'changed', removed:'removed', ready:'ready'}

    validates :status, inclusion:{in: STATUSES.values}

      def change_status
        self.status = STATUSES[:new]

      end

end

 

now

classPhoto<ActiveRecord::Base 
    STATUSES =[STATUS_QUEUED ='queued', STATUS_NEW ='new', STATUS_CHANGED ='changed', STATUS_REMOVED ='removed', STATUS_READY ='ready']

    validates :status, inclusion:{in: STATUSES}

    def change_status
        self.status =Photo::STATUS_QUEUED
    end

end