Store an Array attribute in the Data Base

Question

I have an attribute in my entity that should store multiple Int. This is how the recieved JSON from the API looks like

 {
    "type": “KsCell”,
    “id”: 23,
    “allowedSize”: [1,2],
},

How can I declare/store this in the xcdatamodeld?

this is a list of attribute I can choose from, there is no array

Which one is the array type? I tried Transformable but it's not working — kev.a, Nov 02 '16 at 12:18
you can convert array value to string while inserting into coredata and while fetching just convert again in array thats d only option you can do in this situation — Shobhakar Tiwari, Nov 02 '16 at 12:22

score 0 · Accepted Answer · edited May 23 '17 at 10:27

There is no "native" array or dictionary type in Core Data. You can store an NSArray or an NSDictionary as a transformable attribute. This will use the NSCoding to serialize the array or dictionary to an NSData attribute (and appropriately deserialize it upon access). - src

So, possible solution might be using of Transformable type.

As an expample, you can declare it in your NSManagedObject as:

@NSManaged var allowedSizes: [NSNumber]

and assign your parsed ints array from json

myObject!.allowedSizes = allowedSizeArray //[1,2]

Another solution is to use NSKeyedArchiver to convert your array into NSData.

let allowedSizes = NSKeyedArchiver.archivedDataWithRootObject(allowedSizeArray) // NSData

Store an Array attribute in the Data Base

1 Answers1