!!private

The !!private modifier prevents a field from being redefined in child types that use extends. It protects fields that should stay exactly as the parent defined them.

Syntax

Place !!private at the end of a field line, after all decorators:

abstract model BaseEntity {
  id Record @id !!private
  createdAt Date @createdAt !!private
  updatedAt Date @updatedAt !!private
}

model User extends BaseEntity {
  email Email @unique
  name String
}

User inherits id, createdAt, and updatedAt from BaseEntity but cannot redefine them — any attempt raises a validation error.

Override Prevention

Private prevents one thing: redefining the field in a child's body.

abstract model Base {
  id Record @id !!private
  name String !!private
}

// ERROR: Cannot override private field 'name'
model Child extends Base {
  name String @default('override')  // not allowed
}

Private fields can still be:

• Inherited normally — the field appears in the child's generated types
• Omitted from pick lists (extends Base[!name])
• Excluded via pick (extends Base[id] only keeps listed fields)

!!private controls override, not visibility.

Where Allowed

Combining with Decorators

!!private goes after all decorators and works alongside any field-level decorator:

abstract model Base {
  id Record @id !!private
  email Email @unique !!private
  createdAt Date @createdAt !!private
  role String @default('user') !!private
}

The decorators apply as normal. !!private only adds override-protection on top.