container
The operation’s container.
Declaration
var container: CKContainer? { get set }Discussion
The container defines where the operation executes. The add(_:) method of the CKContainer and CKDatabase classes implicitly set this property to their container.
If you execute the operation yourself, either directly or using a custom operation queue, set the value of this property explicitly. If the value is nil when you execute an operation, the operation implicitly executes in your app’s default container.