AttributeError: 'XXXXX' object has no attribute 'YYYYY' only in aws lambda function

[ivanyschen]

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Example Code

class CoursePostgresORM(SQLModel, table=True):
    __tablename__ = 'courses'
    __table_args__ = {'schema': 'course_catalog', }
    id_: str = Field(alias='id', sa_column=Column('id', primary_key=True))

    regions: List['CourseRegionLinkPostgresORM'] = Relationship(back_populates='course')
    
class RegionPostgresORM(SQLModel, table=True):
    __tablename__ = 'regions'
    __table_args__ = {'schema': 'public', }
    id_: int = Field(sa_column=Column('id', primary_key=True))

    courses: List['CourseRegionLinkPostgresORM'] = Relationship(back_populates='region')

class CourseRegionLinkPostgresORM(SQLModel, table=True):
    __tablename__ = 'courses_regions'
    __table_args__ = {'schema': 'course_catalog', }
    course_id: str = Field(foreign_key='course_catalog.courses.id', primary_key=True)
    region_id: int = Field(foreign_key='public.regions.id', primary_key=True)
    modified_at: datetime
    created_at: datetime

    course: 'CoursePostgresORM' = Relationship(back_populates='regions')
    region: 'RegionPostgresORM' = Relationship(back_populates='courses')


def lambda_handler(event, context):
    """
    This LF responsible for syncing joint tables.
    """
    LOGGER.info(msg='Updating course-region table...')
    with Session(POSTGRES) as session:
        results = session.exec(select(CourseRegionLinkPostgresORM))
        first_row = results.fetchall()[0]
        print(first_row.region)

Description

I encountered some issue where I was thrown with AttributeError: 'XXXXX' object has no attribute 'YYYYY' while trying to access an Relationship attribute of a model in aws lambda function. I was able to run the above code fine on my local but it would produced the following error in an AWS lambda function.
AttributeError: 'CourseRegionLinkPostgresORM' object has no attribute 'region'. Any thoughts are welcome. I've got stuck for the whole day. Thanks!

Operating System

Other

Operating System Details

AWS lambda function

SQLModel Version

0.0.6

Python Version

3.7

Additional Context

No response

[byrman]

What version of SQLAlchemy is being used in AWS Lambda? Perhaps you bumped into #315?

[ivanyschen]

What version of SQLAlchemy is being used in AWS Lambda? Perhaps you bumped into #315?

@byrman , thanks for pointing me to it! By pinning my sqlalchemy to .34, the code works fine again!