When Apple added the new PersistentContainer class, they changed the location of the data stores. That means that if you add a new PersistentContainer, it won't pick up the current database but create one. The underlying issue is that the new store is inside another folder. How can I specify the folder for a PersistentContainer so that it picks up the old store?
Migrate Objective-C Core Data to Swift Persistent Container
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The persistent store(s) of a
NSPersistentContainerare specified in itspersistentStoreDescriptionsarray property. By default, it contains one persistent store of type SQLite, backed by a file in theApplication Supportfolder of your app's container.The procedure to change this is explained in the Discussion section of the documentation of this property.
The path to the file of this store is specified in the
urlproperty of the thatNSPersistentStoreDescription, which is mutable. So you should set theurlproperty of that singleNSPersistentStoreDescriptionin that array to your desired path.