reload_eagerly.py

from sqlalchemy import inspect
from sqlalchemy.orm import joinedload

def reload_eagerly(obj, *rels):
    state = inspect(obj)
    if not state.persistent:
        raise ValueError("reload_eagerly can only be used on persistent objects")
    query = state.session.query(state.mapper).filter(*[col == val for col, val in zip(state.mapper.primary_key, state.identity)])
    for rel in rels:
        if rel in state.mapper.all_orm_descriptors:
            rel = state.mapper.all_orm_descriptors[rel]
        query = query.options(joinedload(rel))
    return query

# Usage
reload_eagerly(myuser, User.emails, User.friends).one()