Sonata FormMapper how to execute arbitrary code before saving to database?

Question

symfony

I build the form according to its essence using the FormMapper, it saves everything to the database well, it works fine, but it is necessary to display several arbitrary fields on the form (I figured it out), and then, when submitting data from the form, before sending the information to the database, pick up the values ​​of these fields and perform manipulations.
How to do it correctly in sonata? I would be grateful either for an example, or for a good link.

Answer 1

This can be done in the prePersist function in the admin class:
sonata-project.org/bundles/admin/master/doc/refere...