Update publish.rb

lib/mongoid/publish.rb

@@ -7,6 +7,7 @@ module Publish
       field :published,    :type => Boolean, :default => false
 
       scope :published, -> { where(:published => true, :published_at.lte => Time.now) }
+      scope :draft, -> { where(:published => false) }
 
       before_save :set_published_at
     end
@@ -23,6 +24,12 @@ def publish!
       self.published_at = Time.now
       self.save
     end
+
+    def unpublish!
+      self.published    = false
+      self.published_at = nil
+      self.save
+    end
 
     def publication_status
       self.published? ? self.published_at : "draft"
@@ -40,4 +47,4 @@ def list(includes_drafts=true)
     end
 
   end
-end
+end