Gracefully handle when we have a previous chat where the model that it used has gone away.

chat.cpp

@@ -22,6 +22,7 @@ Chat::Chat(QObject *parent)
     connect(m_llmodel, &ChatLLM::responseStarted, this, &Chat::responseStarted, Qt::QueuedConnection);
     connect(m_llmodel, &ChatLLM::responseStopped, this, &Chat::responseStopped, Qt::QueuedConnection);
     connect(m_llmodel, &ChatLLM::modelNameChanged, this, &Chat::handleModelNameChanged, Qt::QueuedConnection);
+    connect(m_llmodel, &ChatLLM::modelLoadingError, this, &Chat::modelLoadingError, Qt::QueuedConnection);
     connect(m_llmodel, &ChatLLM::recalcChanged, this, &Chat::handleRecalculating, Qt::QueuedConnection);
     connect(m_llmodel, &ChatLLM::generatedNameChanged, this, &Chat::generatedNameChanged, Qt::QueuedConnection);
 

chat.h

@@ -82,6 +82,7 @@ Q_SIGNALS:
     void reloadModelRequested(const QString &modelName);
     void generateNameRequested();
     void modelListChanged();
+    void modelLoadingError(const QString &error);
 
 private Q_SLOTS:
     void handleResponseChanged();

chatlistmodel.cpp

@@ -213,6 +213,7 @@ void ChatListModel::restoreChat(Chat *chat)
 {
     chat->setParent(this);
     connect(chat, &Chat::nameChanged, this, &ChatListModel::nameChanged);
+    connect(chat, &Chat::modelLoadingError, this, &ChatListModel::handleModelLoadingError);
 
     if (m_dummyChat) {
         beginResetModel();

chatlistmodel.h

@@ -105,6 +105,8 @@ public:
             this, &ChatListModel::newChatCountChanged);
         connect(m_newChat, &Chat::nameChanged,
             this, &ChatListModel::nameChanged);
+        connect(m_newChat, &Chat::modelLoadingError,
+            this, &ChatListModel::handleModelLoadingError);
         setCurrentChat(m_newChat);
     }
 
@@ -204,6 +206,13 @@ private Q_SLOTS:
         emit dataChanged(index, index, {NameRole});
     }
 
+    void handleModelLoadingError(const QString &error)
+    {
+        Chat *chat = qobject_cast<Chat *>(sender());
+        qWarning() << "ERROR:" << qPrintable(error) << "id" << chat->id();
+        removeChat(chat);
+    }
+
     void printChats()
     {
         for (auto c : m_chats) {

chatllm.cpp

@@ -127,7 +127,8 @@ bool ChatLLM::loadModel(const QString &modelName)
         else
             emit sendModelLoaded();
     } else {
-        qWarning() << "ERROR: Could not find model at" << filePath;
+        const QString error = QString("Could not find model %1").arg(modelName);
+        emit modelLoadingError(error);
     }
 
     if (m_llmodel)

chatllm.h

@@ -58,6 +58,7 @@ public Q_SLOTS:
 
 Q_SIGNALS:
     void isModelLoadedChanged();
+    void modelLoadingError(const QString &error);
     void responseChanged();
     void responseStarted();
     void responseStopped();