Parent instance %s is not bound to a Session; lazy load operation of attribute '%s' cannot proceed

Package:

4189

Exception Class:

orm_exc.DetachedInstanceError

Raise code

self._invoke_raise_load(state, passive, "raise")

        session = _state_session(state)
        if not session:
            if passive & attributes.NO_RAISE:
                return attributes.PASSIVE_NO_RESULT

            raise orm_exc.DetachedInstanceError(
                "Parent instance %s is not bound to a Session; "
                "lazy load operation of attribute '%s' cannot proceed"
                % (orm_util.state_str(state), self.key)
            )

        # if we have a simple primary key load, check the
        # identity map without generating a Query at all
        if u

Links to the raise (1)

https://github.com/sqlalchemy/sqlalchemy/blob/6dbcb792eb60d4e084f0d1252882a0cbad4bc673/lib/sqlalchemy/orm/strategies.py#L843

NO FIXES YET

Just press the button and we will add solution
to this exception as soon as possible

* As many users press the button, the faster we create a fix

Add a possible fix

Please authorize to post fix

Other sqlalchemy exceptions

The unique() method must be invoked on this Result, as it contains results that include joined eager loads against collections

Can't operate on closed transaction inside context manager. Please complete the context manager before emitting further commands.

Can't determine which FROM clause to join from, there are multiple FROMS which can join to this entity. Please use the .select_from() method to establish an explicit left side, as well as providing an explicit ON clause if not present already to help resolve the ambiguity.