Add deleted_at for User

Do not remove the user from the database. Mark as deleted instead.

app/models/user.rb

@@ -20,7 +20,10 @@ class User < ActiveRecord::Base
   has_many :created_orders, :class_name => 'Order', :foreign_key => 'created_by_user_id', :dependent => :nullify
   
   attr_accessor :password, :settings_attributes
-  
+
+  scope :deleted, -> { where.not(deleted_at: nil) }
+  scope :undeleted, -> { where(deleted_at: nil) }
+
   # makes the current_user (logged-in-user) available in models
   cattr_accessor :current_user
   
@@ -178,6 +181,18 @@ class User < ActiveRecord::Base
      self.groups.where(type: '')
   end
 
+  def deleted?
+    deleted_at.present?
+  end
+
+  def mark_as_deleted
+    update_column :deleted_at, Time.now
+  end
+
+  def restore
+    update_column :deleted_at, nil
+  end
+
   def self.authenticate(login, password)
     user = find_by_nick(login) || find_by_email(login)
     if user && user.has_password(password)