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  • Ben Kreeger thinks this is interesting:

However, this leaves our meat and fish recipes unmigrated. To include them, we first duplicate the RecipeToRecipe mapping (unfortunately by hand with the current version of Xcode) and change the filter to be inclusive of Meat and Fish. Then, in this second mapping, we change the Value Expression setting for the Type attribute to Entrée. Taking this step will migrate all of the meat and fish recipes and change the type to Entrée.

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Cover of Core Data in Swift

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This seems to be where I'm currently stuckā€¦