class RuboCop::Cop::Rails::ReversibleMigration

def check_change_table_node(node, block)
  change_table_call(node) do |arg|
    if target_rails_version < 4.0
      add_offense(
        node,
        message: format(MSG, action: 'change_table')
      )
    elsif block.send_type?
      check_change_table_offense(arg, block)
    else
      block.each_child_node(:send) do |child_node|
        check_change_table_offense(arg, child_node)
      end
    end
  end
end