no bug in contains_column:
from sqlalchemy import *
m = MetaData()
table = Table('t2', m,
Column('asl_id', Integer,
ForeignKey('public.asl_list_view.asl_id')),
schema='public'
)
asl_list_view = Table('asl_list_view', m,
Column('asl_id', Integer), schema='public'
)
print table.foreign_keys
print table.foreign_keys[0].column
print table.foreign_keys[0].column.table.schema
print asl_list_view.c['asl_id']
print asl_list_view.c['asl_id'].table.schema
print asl_list_view.c.contains_column(table.foreign_keys[0].column)
print table.join(asl_list_view)
On Jan 12, 2009, at 5:45 PM, _t...@arcor.de wrote:
>
> mapper.add_property( 'zzz', relation( llm_mapper, ... ) ) fails with:
> ArgumentError: Could not determine join condition between parent/
> child tables on relation ....
> Specify a 'primaryjoin' expression. If this is a many-to-many
> relation, 'secondaryjoin' is needed as well.
>
>
> but the foreign key exists:
> (Pdb) llm_mapper.local_table.foreign_keys
> OrderedSet([ForeignKey('public.asl_list_view.asl_id')])
> (Pdb) llm_mapper.local_table.foreign_keys[0].column
> Column('asl_id', Integer(), table=<asl_list_view>, primary_key=True,
> nullable=False)
> (Pdb) llm_mapper.local_table.foreign_keys[0].column.table.schema
> 'public'
> (Pdb) mapper.local_table.c['asl_id']
> Column('asl_id', Integer(), table=<asl_list_view>, primary_key=True,
> nullable=False)
> (Pdb) mapper.local_table.c['asl_id'].table.schema
> 'public'
>
>
> the problem seems to be in the containes_column Method:
> (Pdb) mapper.local_table.c.contains_column
> ( llm_mapper.local_table.foreign_keys[0].column )
> False
>
> A litte workarround solves the problem (expression.py):
> def contains_column(self, col):
> # have to use a Set here, because it will compare the identity
> # of the column, not just using "==" for comparison which will
> always return a
> # "True" value (i.e. a BinaryClause...)
> # orig {
> #return col in util.column_set(self)
> # }
> # workarround {
> col_name = "%s" % col
> for _c in util.column_set(self):
> if col_name == "%s" % _c:
> return True
> return False
> # }
>
> test:
> (Pdb) mapper.local_table.c.contains_column
> ( llm_mapper.local_table.foreign_keys[0].column )
> True
>
> ...and the property is successfully added
>
> I hope it helps.
>
>
> >
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