When customers call our JSON:API API, they can use an "include" parameter to specify related objects to be appended to the response.
However, requests to include are not always satisfiable (e.g. if job.supervisor=null, include=supervisor is ignored). In order to prevent Marshmallow from trying to load nonexistent related objects to append to our API responses, we need to tell it when to ignore a relationship attribute, such as via setting job.supervisor=marshmallow.missing (if it sees job.supervisor=None, it will attempt (and fail) to load the null supervisor object, so we cannot just leave it as-is). Unfortunately, this causes problems as SQLAlchemy attempts to handle the new value: Error Traceback (most recent call last): File "/Users/lucadou/IdeaProjects/person-api/api/unit_tests/test_person_service.py", line 601, in test_get_people_include_job response = self.person_service.get_people(QueryParameters({"include": "jobs"})) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/src/person_service.py", line 61, in get_people response = person_schema.dump(people, many=True) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 557, in dump result = self._serialize(processed_obj, many=many) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 519, in _serialize return [ ^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 520, in <listcomp> self._serialize(d, many=False) File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 525, in _serialize value = field_obj.serialize(attr_name, obj, accessor=self.get_attribute) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow_jsonapi/fields.py", line 248, in serialize return super().serialize(attr, obj, accessor) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/fields.py", line 344, in serialize return self._serialize(value, attr, obj, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow_jsonapi/fields.py", line 274, in _serialize self._serialize_included(item) File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow_jsonapi/fields.py", line 280, in _serialize_included result = self.schema.dump(value) ^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 551, in dump processed_obj = self._invoke_dump_processors( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 1068, in _invoke_dump_processors data = self._invoke_processors( ^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/marshmallow/schema.py", line 1225, in _invoke_processors data = processor(data, many=many, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/src/model/schema/job_schema.py", line 62, in set_null_supervisor job.supervisor = missing ^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/sqlalchemy/orm/attributes.py", line 536, in __set__ self.impl.set( File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/sqlalchemy/orm/attributes.py", line 1466, in set value = self.fire_replace_event(state, dict_, value, old, initiator) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/sqlalchemy/orm/attributes.py", line 1505, in fire_replace_event value = fn( ^^^ File "/Users/lucadou/IdeaProjects/person-api/api/venv/lib/python3.11/site-packages/sqlalchemy/orm/attributes.py", line 2167, in emit_backref_from_scalar_set_event instance_state(child), ^^^^^^^^^^^^^^^^^^^^^ AttributeError: '_Missing' object has no attribute '_sa_instance_state' Is there any way to temporarily disable ORM event listeners when we mutate objects and have no intention of saving the changes/do not intend for the ORM to act on them? -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/34ee3121-e284-4fcb-9c1d-6191557e89bcn%40googlegroups.com.