automatic group infrustructure

db/migrate/20130506020935_add_automatic_to_groups.rb

@@ -0,0 +1,14 @@
+class AddAutomaticToGroups < ActiveRecord::Migration
+  def up
+    add_column :groups, :automatic, :boolean, default: false, null: false
+
+    # all numbers below 100 are reserved for automatic
+    execute <<SQL
+    ALTER SEQUENCE groups_id_seq START WITH 100
+SQL
+  end
+
+  def down
+    remove_column :groups, :automatic
+  end
+end