CODEWITHSUNDEEP
iosswiftnspredicatecloudkit
mlecoz
mlecoz

Reputation: 449

CloudKit: fetching records that have a certain element in a list attribute

I was wondering whether it is possible to form an NSPredicate that would do the following in CloudKit:

Suppose that I have some record type A. Suppose that A has some attribute b that is of type [CKReference]. Let c be some element of type CKReference that could be in b.

I wish to query for all records of type A that have c in the list b. Is it possible to do this with NSPredicate?

Thanks in advance!

EDIT

I basically want to do this (CloudKit - NSPredicate for finding all records that contain specified CKReference in a reference list), but in Swift 3. I'm having trouble finding good resources online that explain how to use contains in an NSPredicate.

Upvotes: 1

Views: 813

Answers (2)

mlecoz
mlecoz

Reputation: 449

Here's what ended up working for me, in terms of the variables I used in the question:

letc= CKReference(recordID: userRecordID!, action: .none)

let joinedPredicate = NSPredicate(format: "%K CONTAINS %@",b,c).

let joinedQuery = CKQuery(recordType:A, predicate: joinedPredicate)

Upvotes: 1

Vaibhav Mehta
Vaibhav Mehta

Reputation: 1

var predicates = [NSPredicate]()
predicates.append(NSPredicate(format: "("your key" CONTAINS[cd]%@)", filterString))

and initialising CKrefrence in swift 

let reference = CKReference(recordID: example.recordID, action: .deleteSelf)

you can create CKReference object by using-- let reference = CKReference(recordID: example.recordID, action: .deleteSelf) where example.recordId will be record Id from your CloudKit and after creating you need to have your filter using predicate where predicates.append(NSPredicate(format: "("your key" CONTAINS[cd]%@)", filterString)) filter string will contains reference of your created CKReference object –

Upvotes: 0

Related Questions