I have two entities, User
and Post
. A User
contains many Post
, and each Post
has only one User
.
I am trying to batch insert more than 1000 posts.
private func newBatchInsertRequest(with posts: [PostData]) -> NSBatchInsertRequest {
var index = 0
let total = posts.count
let batchInsert = NSBatchInsertRequest(entity: Post.entity()) { (managedObject: NSManagedObject) -> Bool in
guard index < total else { return true }
if let post = managedObject as? Post {
let data = posts[index]
post.createdData = data.createdDate
post.identifier = data.identifier
post.text = data.text
}
index += 1
return false
}
PersistenceController.shared.container.performBackgroundTask { context in
try? context.execute(batchInsert)
try? context.save()
}
}
It inserts all the posts that I want to insert. However, I can not configure how to set their User
.
I tried to use the following code, but it did not work.
let updateRequest = NSBatchUpdateRequest(entity: Post.entity())
updateRequest.resultType = .updatedObjectIDsResultType
updateRequest.propertiesToUpdate = ["user": user]
try? context.execute(updateRequest)
I get the following error.
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid relationship ((<NSRelationshipDescription: 0x2801045a0>), name item, isOptional 1, isTransient 0, entity Post, renamingIdentifier item
I can set their user one by one, but it is inefficient due to long processing time.
How to update the user property of Posts in a more efficient way?
Update
All of these posts belongs to one User
which does not exist yet. I need to create it before or after executing the NSBatchInsertRequest
.
User
has three properties
1. createdDate: Date
2. identifier: UUID
3. name: String
My goal is to insert Post that belongs to one Use either using NSBatchInsertRequest
or in a private context so that it does not block the main thread.
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