Removed acts_as_paranoid. Implemented own version.

app/models/group.rb

@@ -1,13 +1,15 @@
 # Groups organize the User. 
 # A Member gets the roles from the Group
 class Group < ActiveRecord::Base
-  has_many :memberships, :dependent => :destroy
+  has_many :memberships
   has_many :users, :through => :memberships
 
   validates :name, :presence => true, :length => {:in => 1..25}
   
   attr_reader :user_tokens
-  
+
+  scope :undeleted, -> { where(deleted_at: nil) }
+
   # Returns true if the given user if is an member of this group.
   def member?(user)
     memberships.find_by_user_id(user.id)
@@ -21,7 +23,19 @@ class Group < ActiveRecord::Base
   def user_tokens=(ids)
     self.user_ids = ids.split(",")
   end
-  
+
+  def deleted?
+    deleted_at.present?
+  end
+
+  def mark_as_deleted
+    # TODO: Checks for participating in not closed orders
+    transaction do
+      memberships.destroy_all
+      # TODO: What should happen to users?
+      update_column :deleted_at, Time.now
+    end
+  end
 end