Custom relations with plugin

Questions and Answers
1
System Information
  • Strapi Version: 3.4.1
  • Operating System: win 10
  • Database: postgreSQL
  • Node Version: 14.16.0
  • NPM Version: 7.5.3
  • Yarn Version: 1.22.4

I am creating a plugin for a new smart dropdown and I need to create a relationship as a content type builder, but I do not understand how it works.
if i write in table model
“ss”:{
“type”: “nextLevelDropdown”,
“model”: “street”
}
its just do not work.((
field has already registred and work but dont save in DB(
i’m trying to use onChange param func but it do not work(