another big commit :D

app/models/blogpost.rb

@@ -1,15 +1,16 @@
 class Blogpost < ActiveRecord::Base
-  attr_accessible :title, :text
-  validates_presence_of :title, :text, :user
-  belongs_to :user
-  has_many :comments
+  attr_accessible :title, :content, :author, :editor
+  validates_presence_of :title, :content, :author
+  belongs_to :user_author, class_name: "User", foreign_key: "user_author_id"
+  belongs_to :user_editor, class_name: "User", foreign_key: "user_editor_id"
+  has_many :comments, :dependent => :destroy
   accepts_nested_attributes_for :comments
 
   def author
-    @author ||= if user.present?
-      user
+    @author ||= if self.user_author.present?
+      user_author
     else
-      User.find_by_name("Deleted user")
+      User.first
     end
   end
 end