Rests model was added

models/restsmodel.cpp

@@ -0,0 +1,40 @@
+#include "restsmodel.h"
+
+RestsModel::RestsModel(QObject *parent) : BaseModel { "rests", parent }
+{
+    connect(this, &BaseModel::dataChanged, this, &RestsModel::clearCache);
+}
+
+float RestsModel::productRest(const QString &storeId, const QString &productId)
+{
+    return findRest(storeId, productId).value("rest", 0.0).toFloat();
+}
+
+void RestsModel::submitRest(const QString &storeId, const QString &productId, float rest)
+{
+    QVariantMap productRest = findRest(storeId, productId);
+    productRest["rest"] = rest;
+    submitItem(productRest);
+}
+
+QVariantMap RestsModel::findRest(const QString &storeId, const QString &productId)
+{
+    Key restKey(storeId, productId);
+    if (m_rests.isEmpty()) {
+        loadCache();
+    }
+    return m_rests.value(restKey, { { "storeId", storeId}, { "productId", productId} });
+}
+
+void RestsModel::loadCache()
+{
+    for (const QVariant &var : items()) {
+        QVariantMap rest = var.toMap();
+        m_rests[Key(rest.value("storeId").toString(), rest.value("productId").toString())] = rest;
+    }
+}
+
+void RestsModel::clearCache()
+{
+    m_rests.clear();
+}