Destroy contact orphans task

app/models/contact.rb

@@ -161,4 +161,20 @@ class Contact < ActiveRecord::Base
       errors.add(:ident_country_code, 'is not following ISO_3166-1 alpha 2 format')
     end
   end
+
+  class << self
+    def find_orphans
+      Contact.where('
+        NOT EXISTS(
+          select 1 from domains d where d.owner_contact_id = contacts.id
+        ) AND NOT EXISTS(
+          select 1 from domain_contacts dc where dc.contact_id = contacts.id
+        )
+      ')
+    end
+
+    def destroy_orphans
+      find_orphans.destroy_all
+    end
+  end
 end

config/schedule.rb

@@ -15,3 +15,7 @@ set :output, 'log/cron.log'
 every 10.minutes do
   runner 'ZonefileSetting.generate_zonefiles'
 end
+
+every 6.months, at: '1am' do
+  runner 'Contact.destroy_orphans'
+end

spec/models/contact_spec.rb

@@ -193,7 +193,7 @@ describe Contact do
         invalid.each do |date|
           @contact.ident = date
           @contact.valid?
-          @contact.errors.full_messages.should == 
+          @contact.errors.full_messages.should ==
             ["Ident Ident not in valid birthady format, should be YYYY-MM-DD"]
         end
       end
@@ -322,3 +322,30 @@ describe Contact, '.check_availability' do
     response[2][:code].should == 'asd14'
   end
 end
+
+describe Contact, '.destroy_orphans' do
+  before do
+    @contact_1 = Fabricate(:contact, code: 'asd12')
+    @contact_2 = Fabricate(:contact, code: 'asd13')
+  end
+
+  it 'destroys orphans' do
+    Contact.find_orphans.count.should == 2
+    Contact.destroy_orphans
+    Contact.find_orphans.count.should == 0
+  end
+
+  it 'should find one orphan' do
+    Fabricate(:domain, owner_contact: @contact_1)
+    Contact.find_orphans.count.should == 1
+    Contact.find_orphans.last.should == @contact_2
+  end
+
+  it 'should find no orphans' do
+    Fabricate(:domain, owner_contact: @contact_1, admin_contacts: [@contact_2])
+    cc = Contact.count
+    Contact.find_orphans.count.should == 0
+    Contact.destroy_orphans
+    Contact.count.should == cc
+  end
+end