Is there any option that I can use to manipulate the data posted from this custom from?

[PrafullaKumarSahu]

Let's consider, I have a Post resource and I created a form to submit a new post using this package, Can I do some changes just before it is getting submitted to the database using this package?

Something like User has posts, now I want Guest to create a new post as Guest, and author_id will remain nullable and author_type column will be having Guest, is it possible?