An ELU post says
Go on a ride suggests having a thrilling experience at a theme park. Go for a ride suggests an excursion on a bicycle, a motor cycle or a horse.
So, I am aware of the concept of 'go on a ride'.
I see an example somewhere
I am feeling very dizzy after going on the ride.
where the speaker used 'the'.
I am aware the rule that 'the' is used when sth/sb has been mentioned. In this case the activity 'go on a ride' indeed had been mentioned though, I guess 'go on a ride' is a fixed combination.
Is it idiomatic to say 'go on the ride'?