class AllowNullPosition < ActiveRecord::Migration def self.up # removes the 'not null' constraint on position fields change_column :issue_statuses, :position, :integer, :default => 1 change_column :roles, :position, :integer, :default => 1 change_column :trackers, :position, :integer, :default => 1 change_column :boards, :position, :integer, :default => 1 change_column :enumerations, :position, :integer, :default => 1 end def self.down # nothing to do end end