For those referring to this thread - there is no method called - isOneToMany() atleast not documented, in the Render Properties API, neither did I find any references to it in the instance.

What I am not sure is - if isManyToMany() if returns false determines a One to Many relationship?

But on the other note, why do we need to determine One to Many? If there exists a reference field on table A referring to a table B - then it is one to Many.

Experts may comment!

Kindly mark my reply as Correct/Helpful, based on the response.

Cheers,

Anish Reghu