Fix reversed return value logic in QJsonModel::load methods

.clang-tidy

@@ -66,10 +66,10 @@ CheckOptions:
 	- { key: readability-identifier-naming.PrivateMemberCase,  value: camelBack }
 
 	# Constants and Enum Values
-	- { key: readability-identifier-naming.ConstantPrefix,   value: 'k' }
+	- { key: readability-identifier-naming.ConstantPrefix,   value: 'k_' }
 	- { key: readability-identifier-naming.ConstantCase,     value: CamelBack }
 
-	- { key: readability-identifier-naming.EnumConstantPrefix, value: '' }
+	- { key: readability-identifier-naming.EnumConstantPrefix, value: 'k' }
 	- { key: readability-identifier-naming.EnumConstantCase,   value: CamelCase }
 
 	# Constant Expression

QJsonModel.cpp

@@ -32,7 +32,9 @@
 #include <QFont>
 
 namespace {
+
 using FieldPermissions = QJsonModel::FieldPermissions;
+using ErrorFlag = QJsonModel::ErrorFlag;
 
 constexpr int kKeyColumn = 0;
 constexpr int kValueColumn = 1;
@@ -86,27 +88,28 @@ QJsonModel::~QJsonModel()
 	delete rootItem;
 }
 
-bool QJsonModel::load(const QString& fileName)
+ErrorFlag QJsonModel::load(const QString& fileName)
 {
 	QFile file(fileName);
-	bool success = false;
+	ErrorFlag result = false;
+
 	if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
-		success = load(&file);
+		result = load(&file);
 		file.close();
 	} else {
-		success = false;
+		result = true;
 	}
 
-	return success;
+	return result;
 }
 
-bool QJsonModel::load(QIODevice* device)
+ErrorFlag QJsonModel::load(QIODevice* device)
 {
 	QTextStream content(device);
 	return loadJson(content.readAll().toUtf8());
 }
 
-bool QJsonModel::loadJson(const QByteArray& json)
+ErrorFlag QJsonModel::loadJson(const QByteArray& json)
 {
 	auto const& jdoc = QJsonDocument::fromJson(json);
 

include/QJsonModel.hpp

@@ -69,9 +69,10 @@ class QJsonModel : public QAbstractItemModel {
 
 	~QJsonModel() override;
 
-	bool load(const QString& fileName);
-	bool load(QIODevice* file);
-	bool loadJson(const QByteArray& json);
+	using ErrorFlag = bool;
+	ErrorFlag load(const QString& fileName);
+	ErrorFlag load(QIODevice* file);
+	ErrorFlag loadJson(const QByteArray& json);
 	QVariant data(const QModelIndex& index, int role) const override;
 	bool setData(
 	    const QModelIndex& index, const QVariant& value,