Proper use of "send" method

I have the following models:

class MainService < ActiveRecord::Base
  has_one :travel_service
end

class TravelService < ActiveRecord::Base
  belongs_to :main_service
end

I can use the following:

@main_service.travel_service = TravelService.new

But I can't use the following:
@main_service.send("travel_service") = TravelService.new

It says " unexpected '=', expecting $ "

What's the correct way of using the "send" method?
(I think this is mainly due to my bad ruby knowledge :frowning: )

Thanks in advance for any help.

But I can't use the following:
@main_service.send("travel_service") = TravelService.new

It says " unexpected '=', expecting $ "

Hi Thushan,

Try:

  @main_service.send("travel_service=", TravelService.new)

#send is a plain old method, and can't be called on the LHS of an
assignment. The method you want to send is "travel_service=", with
TravelService.new as an argument.

Thanks in advance for any help.

'Welcome!
George.

Thanks (again) George. That worked.

Actually, what I want is this:

@main_service.send(service_type, TravelService.new)

Where service_type may contain sevral other service types (including
travel_service). All those service types belongs_to MainService (and
MainService has_one of each of them).