[FIX] TypeError: <function <lambda> at 0x7fb228106b18> is not JSON serializable

document_page/document_page.py

@@ -181,14 +181,3 @@ class document_page_history(models.Model):
                 "Revision-{}".format(v2),
                 context=True
             )
-
-    def __getattr__(self, attr):
-        """Return a dummy callabale"""
-        if attr in ['_sql', 'init', '_ids']:
-            raise AttributeError
-
-        _logger.warning(
-            "Trying to access attribute %s on document_page_history",
-            attr
-        )
-        return (lambda *a, **b: None)