[IMP] openupgrade.chunked: support v19

openupgradelib/openupgrade.py

@@ -3587,7 +3587,10 @@ def chunked(records, single=True):
     """Memory and performance friendly method to iterate over a potentially
     large number of records. Yields either a whole chunk or a single record
     at the time. Don't nest calls to this method."""
-    size = core.models.PREFETCH_MAX
+    # PREFETCH_MAX lives in models in <v19, and tools.constants afterwards
+    size = (
+        getattr(core.models, "PREFETCH_MAX", None) or core.tools.constants.PREFETCH_MAX
+    )
     model = records._name
     ids = records.with_context(prefetch_fields=False).ids
     for i in range(0, len(ids), size):

tests/test_openupgradelib.py

@@ -64,6 +64,19 @@ def test_delete_translations(self):
             record.with_context(lang="fr_FR").description,
         )
 
+    def test_chunked(self):
+        records = self.env["ir.module.module"].search([])
+
+        chunked_records = self.env["ir.module.module"]
+        for chunk in openupgrade.chunked(records):
+            chunked_records += chunk
+        self.assertEqual(records, chunked_records)
+
+        chunked_records = self.env["ir.module.module"]
+        for chunk in openupgrade.chunked(records, single=True):
+            chunked_records += chunk
+        self.assertEqual(records, chunked_records)
+
     def tearDown(self):
         super().tearDown()
         self.cr.close()