根据Rails中的枚举值运行验证

Question

I am working on a rails app and want to validate some fields based on enum . This is what I tried. But am getting some errors

         class Listing < ActiveRecord::Base

              enum status: [:draft, :published]

              scope :draft,     -> { where status: :draft     }
              scope :published, -> { where status: :published }

              validates_presence_of :attribute1, :attribute2, :attribute3, unless: "status.draft?", on: :update

           def publish!
            self.update status: :published
           end
         end

All my status fields have a default value of 0 which will be draft . When I update a listing am getting this error.

undefined method `draft?' for "draft":String

Its happening during the @listing.update(params) . Could someone tell me what am doing wrong here?

Answer 1

When you call enum method, you should not call method from status . just call from object.

It means that do not call @listing.status.draft? , call @listing.draft?

so, do unless: 'draft?' instead of unless: 'status.draft?'

and also you do not need to define scope for status. It automatically define scope methods for enum.

Read doc: http://edgeapi.rubyonrails.org/classes/ActiveRecord/Enum.html