The difference between のある and がある
In my textbook is the phrase やる気のある人, meaning somebody with motivation.

I come across のある quite a lot, but in earlier days of learning Japanese I would have just used がある, as in やる気がある人.

Is がある completely incorrect here? Or is it correct but with a slightly different nuance? Or can のある and がある be used interchangeably?

Question

The difference between のある and がある
In my textbook is the phrase やる気のある人, meaning somebody with motivation.

I come across のある quite a lot, but in earlier days of learning Japanese I would have just used がある, as in やる気がある人.

Is がある completely incorrect here? Or is it correct but with a slightly different nuance? Or can のある and がある  be used interchangeably?

Answer

I've made some research and apparently の and が were essentially interchangeable. Now in modern Japanese, they became mostly differentiated but の can still designate a subject sometimes.