Fix crash when viewing instance public timelines

Use a CoreData in-memory store for public timelines.

Pachyderm/Model/Status.swift

@@ -8,7 +8,7 @@
 
 import Foundation
 
-public final class Status: StatusProtocol, Decodable {
+public final class Status: /*StatusProtocol,*/ Decodable {
     public let id: String
     public let uri: String
     public let url: URL?
@@ -23,8 +23,8 @@ public final class Status: StatusProtocol, Decodable {
 //    public let repliesCount: Int
     public let reblogsCount: Int
     public let favouritesCount: Int
-    public let reblogged: Bool
+    public let reblogged: Bool?
-    public let favourited: Bool
+    public let favourited: Bool?
     public let muted: Bool?
     public let sensitive: Bool
     public let spoilerText: String

Tusker/Controllers/MastodonController.swift

@@ -30,7 +30,8 @@ class MastodonController {
         }
     }
     
-    private(set) lazy var persistentContainer = MastodonCachePersistentStore(for: self)
+    private let transient: Bool
+    private(set) lazy var persistentContainer = MastodonCachePersistentStore(for: accountInfo, transient: transient)
 
     let instanceURL: URL
     var accountInfo: LocalData.UserAccountInfo?
@@ -40,10 +41,11 @@ class MastodonController {
     var account: Account!
     var instance: Instance!
 
-    init(instanceURL: URL) {
+    init(instanceURL: URL, transient: Bool = false) {
         self.instanceURL = instanceURL
         self.accountInfo = nil
         self.client = Client(baseURL: instanceURL)
+        self.transient = transient
     }
     
     func run<Result>(_ request: Request<Result>, completion: @escaping Client.Callback<Result>) {

Tusker/CoreData/MastodonCachePersistentStore.swift

@@ -23,8 +23,17 @@ class MastodonCachePersistentStore: NSPersistentContainer {
     let statusSubject = PassthroughSubject<String, Never>()
     let accountSubject = PassthroughSubject<String, Never>()
 
-    init(for controller: MastodonController) {
+    init(for accountInfo: LocalData.UserAccountInfo?, transient: Bool = false) {
-        super.init(name: "\(controller.accountInfo!.id)_cache", managedObjectModel: MastodonCachePersistentStore.managedObjectModel)
+        if transient {
+            super.init(name: "transient_cache", managedObjectModel: MastodonCachePersistentStore.managedObjectModel)
+            
+            let storeDescription = NSPersistentStoreDescription()
+            storeDescription.type = NSInMemoryStoreType
+            persistentStoreDescriptions = [storeDescription]
+        } else {
+            super.init(name: "\(accountInfo!.id)_cache", managedObjectModel: MastodonCachePersistentStore.managedObjectModel)
+        }
+        
         loadPersistentStores { (description, error) in
             if let error = error {
                 fatalError("Unable to load persistent store: \(error)")

Tusker/CoreData/StatusMO.swift

@@ -106,7 +106,7 @@ extension StatusMO {
         self.content = status.content
         self.createdAt = status.createdAt
         self.emojis = status.emojis
-        self.favourited = status.favourited
+        self.favourited = status.favourited ?? false
         self.favouritesCount = status.favouritesCount
         self.hashtags = status.hashtags
         self.inReplyToAccountID = status.inReplyToAccountID
@@ -115,7 +115,7 @@ extension StatusMO {
         self.mentions = status.mentions
         self.muted = status.muted ?? false
         self.pinnedInternal = status.pinned ?? false
-        self.reblogged = status.reblogged
+        self.reblogged = status.reblogged ?? false
         self.reblogsCount = status.reblogsCount
         self.sensitive = status.sensitive
         self.spoilerText = status.spoilerText

Tusker/Screens/Timeline/InstanceTimelineViewController.swift

@@ -37,7 +37,7 @@ class InstanceTimelineViewController: TimelineTableViewController {
         self.instanceURL = url
 
         // the timeline VC only stores a weak reference to it, so we need to store a strong reference to make sure it's not released immediately
-        instanceMastodonController = MastodonController(instanceURL: url)
+        instanceMastodonController = MastodonController(instanceURL: url, transient: true)
 
         super.init(for: .public(local: true), mastodonController: instanceMastodonController)
         

Tusker/Views/Status/BaseStatusTableViewCell.swift

@@ -261,7 +261,7 @@ class BaseStatusTableViewCell: UITableViewCell {
         mastodonController.run(request) { response in
             DispatchQueue.main.async {
                 if case let .success(newStatus, _) = response {
-                    self.favorited = newStatus.favourited
+                    self.favorited = newStatus.favourited ?? false
                     self.mastodonController.persistentContainer.addOrUpdate(status: newStatus, incrementReferenceCount: false)
                     UIImpactFeedbackGenerator(style: .light).impactOccurred()
                 } else {
@@ -286,7 +286,7 @@ class BaseStatusTableViewCell: UITableViewCell {
         mastodonController.run(request) { response in
             DispatchQueue.main.async {
                 if case let .success(newStatus, _) = response {
-                    self.reblogged = newStatus.reblogged
+                    self.reblogged = newStatus.reblogged ?? false
                     self.mastodonController.persistentContainer.addOrUpdate(status: newStatus, incrementReferenceCount: false)
                     UIImpactFeedbackGenerator(style: .light).impactOccurred()
                 } else {