I'm trying to save an array within Core Data as a property. allImages is going to be assigned to a [String]. I've seen some people say to make it transformable. What is the proper solution to saving this into core data?
1 Answer
how do I get reference to them so I can change the transformable to
[String]
This is actually a good point because the answer I linked too assumed that you were creating your own NSManagedObject subclasses.
It's worth emphasizing that creating/maintaining your own NSManagedObject subclasses by yourself is a perfectly valid option, some might even suggest that it is a preferred option because you get better visibility of any changes overtime if your project is in a repository.
However - last couple of Core Data projects I have been using Xcode to create the subclasses which means you need create another property in an extension.
Here's the general approach that I've been using:
First, in your model file, I name the attribute with the type of object that it represents, in this case an array:
Then create an extension and add a computed property that casts between NSArray and Swift Array type:
extension CoreDataArrayObj {
var images: [String] {
get {
return imagesArray as? Array<String> ?? []
}
set {
imagesArray = newValue as NSArray
}
}
}
3 Comments
bradford gray
I'm getting \n \ in between every different string the array. Does it have to do with converting from Array to NsArray, a core data thing, or something else?
MathewS
No - the characters in the array shouldn't be transformed, so won't have
\n or any other unexpected characters unless you're adding them somewhere!
Ezra Henley
In what file do you put the extension? I'm kind of confused on that part.
Double, but same approach applies forString.