Howto: Dynamically generate CSRF-Token in WTForms with Flask

Question

I have a fruits form that has one FieldList object for the bananas:

bananas = FieldList(FormField(BananaForm))

In the frontend, initially,

Answer 1

I discovered how it works:

The CSRF-Tag can simply be copied. The id must be changed and incremented accordingly, but the hash may stay the same.

I didn't think it was possible to have many Fields with the same CSRF-Tag hash, but it actually does!