Created
November 27, 2016 04:43
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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() |
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