Search code examples
iosswiftxcdatamodel

Store an Array attribute in the Data Base

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

enter image description here

Solution

  • 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