SOLVED: How to filter @Query with specific Value?

@paffi05

Oct '23

I tried my first steps into SwiftData and now i'm stuck for the past 4 weeks. I hope, somebody can help me:

I created a tiny, where you can do treatment planning for Patients. I created a model using SwiftData and iCloudkit:

import Foundation
import SwiftData

@Model
final class Patient {
    var lastName: String = ""
    let uniqueId: UUID

    @Relationship(deleteRule: .cascade) var dockets: [Docket]? = [Docket]()

    init(lastName: String = "", uniqueId: UUID = UUID()) {
        self.lastName = lastName
        self.uniqueId = uniqueId
    }
}

class Docket {
    var name: String?
    var orderIndex: Int?
    let uniqueId: UUID?
    var referredId: UUID?

    // because of iCloudkit: 
    var patients: [Patient]? = [Patient]()

    init(name: String? = "",  orderIndex: Int?,  referredId: UUID?) {
        self.name = name
        self.orderIndex = orderIndex
        self.referredId = referredId
    }
}

Now have a view with a list of patients, and each item leading to an Patient Detail View. In this view, i only want to show all related dockets, sorted by orderIndex. Because i want to use .onMove to reorder the Dockets and dynamically update the orderIndex-value, i need @Query to fetch all the related dockets (for this, i use the following solution )

struct DocketDetailView: View {

    @Bindable var patient: Patient
    @Query (sort: \Docket.orderIndex) var dockets: [Docket]

     var body: some View {

           // Show all related dockets

           ForEach(dockets) { docket in
                 Text(docket.name)
           }
     }

i tried to everything to filter the Query directly, or to copy the Patient.uniqueId to the Docket.referredId and to something like

@Query var dockets: [Docket]

    init() {

        let predicate = #Predicate<Docket> { docket in
            docket.referredId == patient.uniqueId
        }

        _dockets = Query(filter: predicate, sort: \Docket.orderIndex)
    }

but it didn' work at all.

I hope, somebody can help me! After 4 weeks trying to solve this error on my own, i'm kinda desperate.

Thank you!

@Hectorcrdna

Oct '23

Hi,

I did a sample of your project, I had to add the @Model macro to the Docket class because the Query requires that 'Docket' conform to 'PersistentModel', I added the uniqueId property to the Docket init and filtered the query by docket.uniqueId == patientId

ContentView

struct ContentView: View {
    @Environment(\.modelContext) var modelContext
    @Query(sort: \Patient.lastName) var patients: [Patient]

    var body: some View {
        NavigationStack {
            List(patients) { patient in
                NavigationLink {
                    DocketDetailView(patient: patient)
                } label: {
                    Text(patient.lastName)
                }

            }
            .toolbar(content: {
                ToolbarItem(placement: .topBarTrailing) {
                    Button("Add Sample") {
                        try? modelContext.delete(model: Patient.self)

                        for i in 0..<10 {
                            let id = UUID()
                            let sample = Patient(lastName: "Patient \(i)", uniqueId: id)

                            for j in 0..<5 {
                                let sampleDocket = Docket(name: "Patient \(i) - Docket \(j)", orderIndex: j, uniqueID: id, referredId: id)

                                modelContext.insert(sampleDocket)

                            }
                            modelContext.insert(sample)
                        }
                    }
                }
            })
        }
    }
}

DocketDetailView

struct DocketDetailView: View {
    var patient: Patient
    @Query(sort: \Docket.orderIndex) var dockets: [Docket]

    init(patient: Patient) {
        self.patient = patient

        let patientId = patient.uniqueId
        let predicate = #Predicate<Docket> { docket in
            docket.uniqueId == patientId
        }
        _dockets = Query(filter: predicate, sort: \Docket.orderIndex)

    }
    var body: some View {
        List(dockets) { docket in
            Text(docket.name ?? "")
        }
    }
}

@paffi05

Oct '23

@Hectorcrdna, thank you SOOO much!!!

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