Replaces StoreApp.latestVersion with latestSupportedVersion + latestAvailableVersion

We now store the latest supported version as a relationship on StoreApp, rather than the latest available version. This allows us to reference the latest supported version in predicates and sort descriptors.

However, we kept the underlying Core Data property name the same to avoid extra migration.

AltStoreCore/Model/AppVersion.swift

@@ -40,7 +40,7 @@ public class AppVersion: NSManagedObject, Decodable, Fetchable
     
     /* Relationships */
     @NSManaged public private(set) var app: StoreApp?
-    @NSManaged public private(set) var latestVersionApp: StoreApp?
+    @NSManaged @objc(latestVersionApp) public internal(set) var latestSupportedVersionApp: StoreApp?
     
     private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
     {
@@ -113,4 +113,8 @@ public extension AppVersion
 
         return appVersion
     }
+    
+    var isSupported: Bool {
+        return true
+    }
 }

AltStoreCore/Model/DatabaseManager.swift

@@ -232,7 +232,7 @@ private extension DatabaseManager
             else
             {
                 storeApp = StoreApp.makeAltStoreApp(in: context)
-                storeApp.latestVersion?.version = localApp.version
+                storeApp.latestSupportedVersion?.version = localApp.version
                 storeApp.source = altStoreSource
             }
                         

AltStoreCore/Model/InstalledApp.swift

@@ -146,7 +146,7 @@ public extension InstalledApp
     {
         let fetchRequest = InstalledApp.fetchRequest() as NSFetchRequest<InstalledApp>
         fetchRequest.predicate = NSPredicate(format: "%K == YES AND %K != nil AND %K != %K",
-                                             #keyPath(InstalledApp.isActive), #keyPath(InstalledApp.storeApp), #keyPath(InstalledApp.version), #keyPath(InstalledApp.storeApp.latestVersion.version))
+                                             #keyPath(InstalledApp.isActive), #keyPath(InstalledApp.storeApp), #keyPath(InstalledApp.version), #keyPath(InstalledApp.storeApp.latestSupportedVersion.version))
         return fetchRequest
     }
     

AltStoreCore/Model/MergePolicy.swift

@@ -44,7 +44,7 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                     let conflictingAppVersions = conflict.conflictingObjects.lazy.compactMap { $0 as? AppVersion }
                     
                     // Primary AppVersion == AppVersion whose latestVersionApp.latestVersion points back to itself.
-                    if let primaryAppVersion = conflictingAppVersions.first(where: { $0.latestVersionApp?.latestVersion == $0 }),
+                    if let primaryAppVersion = conflictingAppVersions.first(where: { $0.latestSupportedVersionApp?.latestSupportedVersion == $0 }),
                        let secondaryAppVersion = conflictingAppVersions.first(where: { $0 != primaryAppVersion })
                     {
                         secondaryAppVersion.managedObjectContext?.delete(secondaryAppVersion)

AltStoreCore/Model/Migrations/Policies/StoreApp10ToStoreApp11Policy.swift

@@ -48,7 +48,7 @@ fileprivate extension NSManagedObject
     
     func setStoreAppLatestVersion(_ appVersion: NSManagedObject)
     {
-        self.setValue(appVersion, forKey: #keyPath(StoreApp.latestVersion))
+        self.setValue(appVersion, forKey: #keyPath(StoreApp.latestSupportedVersion))
         
         let versions = NSOrderedSet(array: [appVersion])
         self.setValue(versions, forKey: #keyPath(StoreApp._versions))

AltStoreCore/Model/StoreApp.swift

@@ -78,7 +78,7 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
     @NSManaged @objc(source) public var _source: Source?
     @NSManaged @objc(permissions) public var _permissions: NSOrderedSet
     
-    @NSManaged public private(set) var latestVersion: AppVersion?
+    @NSManaged @objc(latestVersion) public private(set) var latestSupportedVersion: AppVersion?
     @NSManaged @objc(versions) public private(set) var _versions: NSOrderedSet
     
     @NSManaged public private(set) var loggedErrors: NSSet /* Set<LoggedError> */ // Use NSSet to avoid eagerly fetching values.
@@ -227,16 +227,30 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
     }
 }
 
-private extension StoreApp
+internal extension StoreApp
 {
     func setVersions(_ versions: [AppVersion])
     {
-        guard let latestVersion = versions.first else { preconditionFailure("StoreApp must have at least one AppVersion.") }
-        
-        self.latestVersion = latestVersion
         self._versions = NSOrderedSet(array: versions)
         
+        let latestSupportedVersion = versions.first(where: { $0.isSupported })
+        self.latestSupportedVersion = latestSupportedVersion
+        
+        for case let version as AppVersion in self._versions
+        {
+            if version == latestSupportedVersion
+            {
+                version.latestSupportedVersionApp = self
+            }
+            else
+            {
+                // Ensure we replace any previous relationship when merging.
+                version.latestSupportedVersionApp = nil
+            }
+        }
+                
         // Preserve backwards compatibility by assigning legacy property values.
+        guard let latestVersion = versions.first else { preconditionFailure("StoreApp must have at least one AppVersion.") }
         self._version = latestVersion.version
         self._versionDate = latestVersion.date
         self._versionDescription = latestVersion.localizedDescription
@@ -247,6 +261,10 @@ private extension StoreApp
 
 public extension StoreApp
 {
+    var latestAvailableVersion: AppVersion? {
+        return self._versions.firstObject as? AppVersion
+    }
+    
     @nonobjc class func fetchRequest() -> NSFetchRequest<StoreApp>
     {
         return NSFetchRequest<StoreApp>(entityName: "StoreApp")