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Currently, the code generation for CoreData fetch requests generates a single method for each fetch that handles building and executing the query. This makes it very difficult to override the fetch request behavior in the subclass. My suggestion is to split the generated method for each fetch into two methods, one that build and returns the NSFetchRequest and the other that takes an existing request and executes it.
I agree. Toss me a Pull Request? https://github.com/rentzsch/mogenerator/blob/master/CONTRIBUTING.md
I'll see what I can do. What classes would I need to look at to change how the fetch requests get generated?