class RuboCop::Cop::Rails::SafeNavigation

def replacement(method, params)
  new_params = params.map(&:source).join(', ')
  if method.end_with?('=')
    "&.#{method[0...-1]} = #{new_params}"
  elsif params.empty?
    "&.#{method}"
  else
    "&.#{method}(#{new_params})"
  end
end