Read at most cache size or IN_MAX records from the database

issue11468
review427111003

trytond/model/modelstorage.py

@@ -1676,11 +1676,13 @@ class ModelStorage(Model):
                 if id_ not in s:
                     s.add(id_)
                     yield id_
+        read_size = max(1, min(
+                self._cache.size_limit, self._local_cache.size_limit,
+                self._transaction.database.IN_MAX))
         index = self._ids.index(self.id)
         ids = chain(islice(self._ids, index, None),
             islice(self._ids, 0, max(index - 1, 0)))
-        ids = islice(unique(filter(filter_, ids)),
-            self._transaction.database.IN_MAX)
+        ids = islice(unique(filter(filter_, ids)), read_size)
 
         def instantiate(field, value, data):
             if field._type in ('many2one', 'one2one', 'reference'):
@@ -1744,7 +1746,7 @@ class ModelStorage(Model):
                 read_data = []
                 for id_ in islice(chain(islice(self._ids, index, None),
                             islice(self._ids, 0, max(index - 1, 0))),
-                        self._transaction.database.IN_MAX):
+                        read_size):
                     if id_ in self._cache:
                         data = {'id': id_}
                         for fname in ffields: