Every Field has their own rules implementation to manage how should be treated in the front, you can see more on each Field page

Rules

To set rules, use the rules method.

  TextField("Name", "name").rules("required", "max:40")
  

Create rules

To set rules that will appear on create, use the create_rules method.

  Password("Password").create_rules("required", "min:8", "max:40")
  

Update rules

To set rules that will appear on update, use the update_rules method.

  Password("Password", "password").update_rules("nullable", "min:8", "max:40")