Suppose I have two tables in mysql, there is no referential constraint
defined.
Tables: banks, locations
Schema for banks: id, name, country_id
Schema for locations: id, name
banks.country_id will be foreign key of locations.id, but
banks.country_id can be null too.
Two tables are reflected as follows:
Class Bank(object):
pass
class Location(object):
pass
there were load as follows:
bank_table = Table('banks',metadata, autoload = True)
location_table = Table('locations',metadata, autoload = True)
mapper(Location, location_table)
mapper(Bank, bank_table, properties =
{'country': relation(Location,
primaryjoin =
bank_table.c.country_id == location_table.c.id,
foreign_keys =
[bank_table.c.country_id],
lazy = False,
uselist = False
)
}
)
Now i was going to add a bank object , using the following data
{'name': 'Bank A', 'country_id': '1'}
I was called by the following error:
exception = 'int' object has no attribute '_sa_instance_state'
please help me.
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