ERD

```kroki {_type=plantuml}

@startuml
object Foo {
+ field1
+ field2
+ public
- private
# protected
~ package private
* unknown
}

object Bar {
+ field3
+ field4
}

object user {
+ name
+ id
}

Foo::field1 --> Bar::field3 : foo
Foo::field2 --> Bar::field4 : bar
Foo::private "1" .. "0.." user::name
@enduml
```