Use Realm Object Directly (i.e as CollectionView Data Source) - ios

Question

So i have this Realm Object class :
import Realm
import RealmSwift
class Realm_item: Object {
var item_ID : String!
required init() {
super.init()
}
// And this one too
required override init(realm: RLMRealm, schema: RLMObjectSchema) {
super.init(realm: realm, schema: schema)
}
// Now go nuts creating your own constructor
init(myCustomValue: String) {
self.item_ID = myCustomValue
super.init()
}
override class func primaryKey() -> String {
return "item_ID"
}
}
Than i am trying to initialize it, but it simply stuck, with no exception or error/crash.
let item = Realm_item(myCustomValue: "SampleString")
self.dataSource.append(item)

Answer 1

There is few comments I have on your code.
item_ID should be dynamic
it's better to define a default value for item_ID instead of making it optional
you should not to create or override init and only create custom init(s) as convenience
import Realm is not needed import RealmSwift is enough.
The code should look like this.
import RealmSwift
class Realm_item: Object {
dynamic var item_ID : String = ""
// You should only define init(s) as convenience and call self.init() inside it.
convenience init(myCustomValue: String) {
self.init()
self.item_ID = myCustomValue
}
override class func primaryKey() -> String {
return "item_ID"
}
}
Then you use it like the way you do.
let item = Realm_item(myCustomValue: "SampleString")
self.dataSource.append(item)
I hope this helps. Thanks.
Update:
What does dynamic keyword mean?? pleas see this Answer
Why do we use dynamic variables with realm? as mensioned in Realm
Swift Docs
Realm model properties need the dynamic var attribute in order for
these properties to become accessors for the underlying database data.
There are two exceptions to this: List and RealmOptional properties
cannot be declared as dynamic because generic properties cannot be
represented in the Objective-C runtime, which is used for dynamic
dispatch of dynamic properties, and should always be declared with
let.
Is it a good practice to use Realm objects as DataSource? The way
you are using in the code sample you have dataSource as
Array<Realm_Item> is a good way as the array size will not change
automatically while the objects will be updated automatically (if
there is other part of the code modifying it)