Function _setup_entity_query

lib/sqlalchemy/orm/loading.py:752–804

(
    compile_state,
    mapper,
    query_entity,
    path,
    adapter,
    column_collection,
    with_polymorphic=None,
    only_load_props=None,
    polymorphic_discriminator=None,
    **kw,
)

def _setup_entity_query(
    compile_state,
    mapper,
    query_entity,
    path,
    adapter,
    column_collection,
    with_polymorphic=None,
    only_load_props=None,
    polymorphic_discriminator=None,
    **kw,
):
    if with_polymorphic:
        poly_properties = mapper._iterate_polymorphic_properties(
            with_polymorphic
        )
    else:
        poly_properties = mapper._polymorphic_properties

    quick_populators = {}

    path.set(compile_state.attributes, "memoized_setups", quick_populators)

    # for the lead entities in the path, e.g. not eager loads, and
    # assuming a user-passed aliased class, e.g. not a from_self() or any
    # implicit aliasing, don't add columns to the SELECT that aren't
    # in the thing that's aliased.
    check_for_adapt = adapter and len(path) == 1 and path[-1].is_aliased_class

    for value in poly_properties:
        if only_load_props and value.key not in only_load_props:
            continue
        value.setup(
            compile_state,
            query_entity,
            path,
            adapter,
            only_load_props=only_load_props,
            column_collection=column_collection,
            memoized_populators=quick_populators,
            check_for_adapt=check_for_adapt,
            **kw,
        )

    if (
        polymorphic_discriminator is not None
        and polymorphic_discriminator is not mapper.polymorphic_on
    ):
        if adapter:
            pd = adapter.columns[polymorphic_discriminator]
        else:
            pd = polymorphic_discriminator
        column_collection.append(pd)


def _warn_for_runid_changed(state):