Core Data by Tutorials v3.0
On page 45: I think it should be indicated to the reader which entity Codegen option should be set before generating the BowTie+CoreDataClass.swift and BowTie+CoreDataProperties.swift files. Using the default option results in Swift compiler errors during the build process.
Please see my response to this post for more details: Chapter 2: Error 'Bowtie' is ambiguous for type lookup in this context - #2 by harri