Hi,
I'm using sqlalchemy 0.5 beta 3 and I am trying to have a Call object
that contains two relations to a Contact object. One is the callee
and the other is the caller. The code is as follows:
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Table, Column, Integer, String, MetaData,
ForeignKey
from sqlalchemy.orm import relation, backref, mapper
Base = declarative_base()
metadata = Base.metadata
contact_table = Table('contact', metadata,
Column('id', Integer, primary_key=True),
Column('first_name', String(20)),
Column('last_name', String(30)))
call_table = Table('call', metadata,
Column('id', Integer, primary_key=True),
Column('subject', String(255)),
Column('callee_id', Integer, ForeignKey('contact.id')),
Column('caller_id', Integer, ForeignKey('contact.id')))
class Contact(object):
def __init__(self, first_name, last_name):
self.first_name = first_name
self.last_name = last_name
def __repr__(self):
return self.first_name + ' ' + self.last_name
mapper(Contact, contact_table)
class Call(object):
def __init__(self, subject, callee, caller):
self.subject = subject
self.callee = callee
self.caller = caller
def __repr__(self):
return self.subject
mapper(Call, call_table, properties={
'callee':relation(Call,
primaryjoin=call_table.c.callee_id==contact_table.c.id,
backref='callee_calls'),
'caller':relation(Call,
primaryjoin=call_table.c.caller_id==contact_table.c.id,
backref='caller_calls')
})
c = Contact('my_first_name', 'my_last_name')
I get a long error:
sqlalchemy.exc.ArgumentError: Could not locate any equated, locally
mapped column pairs for primaryjoin condition 'call.caller_id =
contact.id' on relation Call.caller. For more relaxed rules on join
conditions, the relation may be marked as viewonly=True.
Can someone tell me what I'm doing wrong, please?
Thanks,
Rob
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