Get all attribute names of Core Data entity; Swift

Question

Is there a more efficient way to retrieve all the names/titles of attributes of a NSManagedObject than this:

func getAllAttributeTitles(_ myStatSheet:StatSheet) -> Array<String> {

    let dictAttributes = myStatSheet.entity.attributesByName
    var arrAttributeTitles:Array<String> = []

    for (key, _) in dictAttributes {
        arrAttributeTitles.append(key)
    }

    return arrAttributeTitles
}

That’s literally the intended way to do it. Are you finding that it’s inefficient in some way? Slow? — Tom Harrington
– Tom Harrington, Commented Mar 24, 2018 at 16:44
No, just wasn't sure if there was a different way to do it that I might of missed. I had to sleuth through the docs to figure it out so just wanted to check. Thanks for the comment. — PruitIgoe
– PruitIgoe, Commented Mar 24, 2018 at 18:33

Tom Harrington · Accepted Answer · 2018-03-25 00:52:48Z

5

As I mentioned, what you've got is the right way to do it. There are other ways but I wasn't at a Mac earlier and couldn't try them out.

A more "Swift-y" way to get the array would be something like

let arrAttributeTitles = myStatSheet.entity.attributesByName.enumerated().map { $0.element.key }

This won't be any more efficient, since it's really doing the same things, but it might be more what you were thinking of when you asked. It's still getting attributesByName and iterating over the result to get strings naming the attributes.

It might be worth noting that the argument type on your method could be NSManagedObject instead of StatSheet, since the code will work for any managed object of any entity type.

answered Mar 25, 2018 at 0:52

Tom Harrington

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3 Comments

PruitIgoe Over a year ago

Thanks, that's really what I was asking, the reduction of lines of code.

PruitIgoe Over a year ago

Which code would you prefer in your code base, the more Swifty or the more verbose?

Tom Harrington Over a year ago

If I was writing it I’d write the Swifty version. If someone else on the project wrote your version I wouldn’t think it needed changing.

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