How can I solve the error: entity GroceryItems is not key value coding-compliant for the key “hasLocations?

(From the comments:) The crash is caused by the fact that the entity is declared as "GroceryItems", but "hasLocations" is a property of the class "GroceryItem". The fetch request returns an array of "GroceryItems" objects, which do not respond to the "hasLocations" method.

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