Core Data: Solving Ambiguous Type / Redeclaration of Type

This article addresses compiler errors like 'Invalid redeclaration of Product' or 'Product is ambiguous for type lookup' when creating NSManagedObject subclasses in Core Data with Xcode 8. It explains the conflict caused by Xcode 8's default auto code generation for entities. The solution involves manually setting the Codegen property to 'Manual/None' for each entity, choosing 'Current Product Module' for the module, and clearing derived data. This technical guide is relevant to iOS developers working with Core Data, Swift, and Xcode, providing step-by-step instructions to fix build issues and regain control over NSManagedObject subclass implementation.