CoreData - can't set empty string as default value for attribute

Question

I have an entity in my datamodel with a string attribute that is currently optional, and I\'d like to convert this to a required attribute with a default value of the empty stri

Answer 1

Here is the Swift solution based on David Ravetti's answer and edelaney05's comment. In addition, I added optionality check.

This solution works fine in my projects.

class ExampleEntity: NSManagedObject {

    ...

    override func awakeFromInsert() {
        super.awakeFromInsert()
        for (key, attr) in self.entity.attributesByName {
            if attr.attributeType == .stringAttributeType && !attr.isOptional {
                if self.value(forKey: key) == nil {
                    self.setPrimitiveValue("", forKey: key)
                }
            }
        }
    }

    ...
}