book-gen | Experiments on summarization-driven book generation | Natural Language Processing library

Is there any reason you need to do this with a single call? I'm assuming from your structure that you're not going to create a new genre for every book you create, so most of the time, you're just inserting a book record and a book_gen_rel record. In the real world, you're probably going to have books that fall into multiple genres, so eventually you're going to be changing your function to handle the insert of a single book along with multiple genres in a single call.

That being said, there are two ways too approach this. You can make multiple API calls from the client (and there's really no problem doing this -- it's quite common). Second, you could do it all in a single call if you create a PostgreSQL function and call it with .rpc().

Example using just client calls to insert a record in each table: