diff -r 37f936073cac -r e1ced2523cad src/model.cpp
--- a/src/model.cpp	Sun Oct 24 11:33:32 2021 +0300
+++ b/src/model.cpp	Tue Nov 02 15:43:57 2021 +0200
@@ -23,22 +23,14 @@
 #include <QSaveFile>
 #include "model.h"
 #include "modeleditcontext.h"
+#include "documentmanager.h"
 
 /**
  * @brief Constructs a model
  * @param parent QObject parent to pass forward
  */
-Model::Model(QObject* parent) : 
-	Model{"", parent} {}
-
-/**
- * @brief Constructs a model
- * @param path Path that was used to open the model
- * @param parent QObject parent to pass forward
- */
-Model::Model(const QString& path, QObject *parent) :
-	QAbstractListModel{parent},
-	storedPath{path}
+Model::Model(QObject *parent) :
+	QAbstractListModel{parent}
 {
 	connect(this, &Model::dataChanged, [&](){ this->needRecache = true; });
 }
@@ -150,10 +142,14 @@
 	if (this->needRecache)
 	{
 		this->cachedPolygons.clear();
-		ldraw::GetPolygonsContext context{documents};
-		for (int i = 0; i < this->size(); i += 1)
+		const std::optional<ModelId> modelId = documents->findIdForModel(this);
+		if (modelId.has_value())
 		{
-			this->getObjectPolygons(i, this->cachedPolygons, &context);
+			ldraw::GetPolygonsContext context{modelId.value(), documents};
+			for (int i = 0; i < this->size(); i += 1)
+			{
+				this->getObjectPolygons(i, this->cachedPolygons, &context);
+			}
 		}
 		this->needRecache = false;
 	}
@@ -188,15 +184,7 @@
 	return this->objectAt(index)->id;
 }
 
-/**
- * @brief Gets the path to the model
- * @return path
- */
-const QString& Model::path() const
-{
-	return this->storedPath;
-}
-
+#if 0
 /**
  * @brief Sets the path to the model
  * @param path New path to use
@@ -220,6 +208,7 @@
 		}
 	}
 }
+#endif
 
 /**
  * @brief Gets the GL polygons of the object at the specified position in the model
@@ -304,39 +293,13 @@
 
 /**
  * @brief Attempts the save the model
- * @param errors Where to write any errors
- * @returns whether it succeeded
  */
-bool Model::save(QTextStream &errors) const
+void Model::save(QIODevice* device) const
 {
-	QSaveFile file{this->path()};
-	file.setDirectWriteFallback(true);
-	if (file.open(QSaveFile::WriteOnly))
+	QTextStream out{device};
+	for (const ModelObjectPointer& object : this->body)
 	{
-		QTextStream out{&file};
-		for (const ModelObjectPointer& object : this->body)
-		{
-			out << object.get()->toLDrawCode() << "\r\n";
-		}
-		const bool commitSucceeded = file.commit();
-		if (not commitSucceeded)
-		{
-			errors << tr("Could not save to %1: %2")
-				.arg(this->path())
-				.arg(file.errorString());
-			return false;
-		}
-		else
-		{
-			return true;
-		}
-	}
-	else
-	{
-		errors << tr("Could not open %1 for writing: %2")
-			.arg(file.fileName())
-			.arg(file.errorString());
-		return false;
+		out << object.get()->toLDrawCode() << "\r\n";
 	}
 }