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I want to create NSFetchRequest and set properties to fetch like this:
request.propertiesToFetch = @[@"a", @"b", @"c"];
where a and b are stored in Core Data database, and c is transient. executeFetchRequest: fires an error Invalid keypath c passed to setPropertiesToFetch:. But if I uncheck transient-checkbox for property c everything will work fine.
So is it really impossible to fetch transient properties or I'm doing something wrong?
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A transient property is a property that is not persisted to the database. Transient properties can have non-null values on the clipboard, but when a clipboard page containing transient properties is saved to the PegaRULES database, the values are removed from the Storage Stream column.
Transient attributes are properties that you define as part of the model, but that are not saved to the persistent store as part of an entity instance's data. Core Data does track changes you make to transient properties, so they are recorded for undo operations.
Yes, it is really impossible. You can't fetch them because they don't exist in the persistent store - that's what it means to be transient. You can fetch whatever persistent attributes the derived, transient, attribute is created from.
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