Fix some crashes (#1141)

* feat(Core Data): add fetchSlate to Source

* fix(home): simplify relationship chain in RecentSavesView and RecommendationsView to prevent potential SwiftData related crashes

* fix(home): let HomeActions fetch the slate from a Core Data background context instead of SlateDetailView to prevent some potential SwiftData related crashes

* fix(home): update RecommendationsView, retrieve analyticsID directly from the recommendation instead of going back and forth from the related item

* fix(home): update SlateDetailView, simplify relationship chain for domain

Author: Gio2018

PocketKit/Sources/PocketKit/Home/Models/HomeActions.swift

@@ -102,16 +102,24 @@ extension HomeActions {
         }
     }
 
-    func trackSlateDetailImpression(info: SlateInfo) {
+    func trackSlateDetailImpression(_ slateID: String) {
         Task(priority: .background) {
+            let source = await Services.shared.source
+            guard let slate = source.fetchSlate(slateID) else {
+                return
+            }
             let tracker = await Services.shared.tracker
+            var sortIndex: Int?
+            if let index = slate.sortIndex {
+                sortIndex = Int(truncating: index)
+            }
             tracker.track(
                 event: Events.ExpandedSlate.slateExpanded(
-                    slateId: info.slateId,
-                    slateRequestId: info.slateRequestId,
-                    slateExperimentId: info.slateExperimentId,
-                    slateIndex: info.slateIndex,
-                    slateLineupId: info.slateLineupId
+                    slateId: slateID,
+                    slateRequestId: slate.requestID,
+                    slateExperimentId: slate.experimentID,
+                    slateIndex: sortIndex ?? 0,
+                    slateLineupId: slate.slateLineup?.remoteID ?? ""
                 )
             )
         }

PocketKit/Sources/PocketKit/Home/Views/Detail views/SlateDetailView.swift

@@ -44,10 +44,7 @@ struct SlateDetailView: View {
             }
         }
         .onAppear {
-            guard let slateInfo = slateInfo(destination) else {
-                return
-            }
-            homeActions.trackSlateDetailImpression(info: slateInfo)
+            homeActions.trackSlateDetailImpression(destination.slateID)
         }
         .animation(.smooth, value: cards)
         .navigationTitle(destination.slateTitle ?? "")
@@ -66,7 +63,7 @@ private extension SlateDetailView {
                     type: .slateDetail,
                     index: $0.offset,
                     shareURL: item.shareURL,
-                    domain: item.bestDomain,
+                    domain: item.domain,
                     timeToRead: item.timeToRead,
                     isSyndicated: item.isSyndicated,
                     recommendationID: item.recommendation?.analyticsID,
@@ -83,23 +80,6 @@ private extension SlateDetailView {
         }
     }
 
-    /// Fetch analytics info for this slate
-    /// - Parameter destination: slate destination of this slate
-    /// - Returns: analytics info
-    func slateInfo(_ destination: SlateDestination) -> SlateInfo? {
-        guard let slate = fetchSlate(destination.slateID),
-              let lineup = fetchSlateLineup() else {
-            return nil
-        }
-        return SlateInfo(
-            slateId: slate.remoteID,
-            slateRequestId: slate.requestID,
-            slateExperimentId: slate.experimentID,
-            slateIndex: Int(slate.sortIndex ?? 0),
-            slateLineupId: lineup.remoteID
-        )
-    }
-
     /// Fetch an `Item` from the underlying `Recommendation`
     /// - Parameter recommendationID: `Recommendation` ID
     /// - Returns: the item, if it was found
@@ -112,19 +92,6 @@ private extension SlateDetailView {
         return result.first
     }
 
-    /// Fetch the current slate from SwiftData
-    /// - Parameter remoteID: the remote id of this slate
-    /// - Returns: the slate, if it was found
-    @MainActor
-    func fetchSlate(_ remoteID: String) -> Slate? {
-        let predicate = #Predicate<Slate> { $0.remoteID == remoteID }
-        var fetchDescriptor = FetchDescriptor(predicate: predicate)
-        fetchDescriptor.fetchLimit = 1
-
-        let result = (try? modelContext.fetch(fetchDescriptor)) ?? []
-        return result.first
-    }
-
     /// Fettch the current slate lineup
     /// - Returns: the slate lineup, if it was found
     func fetchSlateLineup() -> SlateLineup? {

PocketKit/Sources/PocketKit/Home/Views/Top level views/RecentSavesView.swift

@@ -79,7 +79,7 @@ private extension RecentSavesView {
                 type: .recentSave,
                 index: $0.offset,
                 shareURL: item.shareURL,
-                domain: item.bestDomain,
+                domain: item.domain,
                 timeToRead: item.timeToRead,
                 isSyndicated: item.isSyndicated == true,
                 recommendationID: item.recommendation?.analyticsID,

PocketKit/Sources/PocketKit/Home/Views/Top level views/RecommendationsView.swift

@@ -139,10 +139,10 @@ private extension RecommendationsView {
                         type: .recommendation,
                         index: Int($0.sortIndex),
                         shareURL: item.shareURL,
-                        domain: item.bestDomain,
+                        domain: item.domain,
                         timeToRead: item.timeToRead,
                         isSyndicated: item.isSyndicated,
-                        recommendationID: item.recommendation?.analyticsID,
+                        recommendationID: $0.analyticsID,
                         bestTitle: item.bestTitle,
                         slug: item.collectionSlug,
                         excerpt: item.excerpt,

PocketKit/Sources/Sync/PocketSource.swift

@@ -1036,6 +1036,10 @@ extension PocketSource {
         }
         return updatedItem
     }
+
+    public func fetchSlate( _ slateID: String) -> CDSlate? {
+        try? space.fetchSlate(byRemoteID: slateID)
+    }
 }
 
 // MARK: - Collections

PocketKit/Sources/Sync/Source.swift

@@ -136,6 +136,8 @@ public protocol Source {
 
     func fetchSavedItem(_ url: String) -> CDSavedItem?
 
+    func fetchSlate( _ slateID: String) -> CDSlate?
+
     /// Get the count of unread saves
     /// - Returns: Int of unread saves
     func unreadSaves() throws -> Int

PocketKit/Tests/PocketKitTests/Support/MockSource.swift

@@ -8,6 +8,10 @@ import CoreData
 import Combine
 
 class MockSource: Source {
+    func fetchSlate(_ slateID: String) -> Sync.CDSlate? {
+        nil
+    }
+
     func makeNotesController() -> NSFetchedResultsController<Sync.CDNote> {
         NSFetchedResultsController()
     }