export: Fix deep relations

export.py

@@ -71,4 +71,6 @@
         if source is not None:
             path = source.split(".")
 
+            cur_fields = fields
+
             for i, fname in enumerate(path):
@@ -74,6 +76,6 @@
             for i, fname in enumerate(path):
-                field = fields[fname]
+                field = cur_fields[fname]
 
                 value_datatype = field["type"]
                 value = getattr(value, fname)
 
@@ -76,13 +78,15 @@
 
                 value_datatype = field["type"]
                 value = getattr(value, fname)
 
-                if (
-                    field["type"] in ("many2one", "many2many", "one2many")
-                    and len(value) == 0
-                ):
-                    value = None
-                    break
+                if field["type"] in ("many2one", "many2many", "one2many"):
+                    cur_fields = value.fields_get()
+                    if len(value) == 0:
+                        value = None
+                        break
+                    # TODO for 2many relations, keep all the values
+                    if i != len(path) - 1:
+                        value = value[0]
 
                 if field["type"] in ("char", "text") and value is False:
                     value = None

tests/test_export.py

@@ -111,6 +111,26 @@
             export(record, m),
         )
 
+    def test_export_deep_relation(self):
+        m = {
+            "company": {
+                "source": "partner_ids.company_id",
+                "mapping": {"name": {}},
+            }
+        }
+
+        c1 = self.env["res.partner.category"].create({"name": "cat1"})
+
+        company = self.env["res.company"].create({"name": "company"})
+
+        p1 = self.env["res.partner"].create(
+            {"name": "partner 1", "company_id": company.id}
+        )
+
+        c1.partner_ids = [p1.id]
+
+        self.assertEqual({"company": {"name": "company"}}, export(c1, m))
+
     def test_export_custom_char(self):
         record = self.env["res.partner"].create({"name": "my name"})
         self.assertEqual(