your 'iva' table-column AND 'iva' attribute/relation/property have same
name, Thats what the error says. either rename one of them (e.g. the column
to become iva_id), or use that allow_column_override=True flag to the
producto mapper.
Marcos wrote:
> Hello, first at all, sorry about my english... I'm from Mendoza,
> Argentina, and I'm starting with this. Because I can't describe my
> problem, I will show the next:
>
> from sqlalchemy import *
> from sqlalchemy.orm import *
>
> class Producto(object):
> pass
>
> class Iva(object):
> pass
>
> metadata = MetaData()
> engine = create_engine('postgres://postgres:[EMAIL PROTECTED]:5432/
> marcos')
> connection = engine.connect()
> Session = sessionmaker(bind=connection, autoflush=True,
> transactional=True)
> session = Session()
>
> iva_tabla = Table( 'iva' , metadata ,
> Column('id' , Integer , primary_key =
> True) ,
> Column('valor', Float)
> )
>
> productos_tabla = Table ( 'productos' , metadata ,
> Column('id', Integer ,
> primary_key = True ) ,
> Column('nro' , Integer ) ,
> Column('descripcion' ,
> String(100) ) ,
> Column('iva' , Integer ,
> ForeignKey('iva.id')) ,
> Column('precioUnitario' ,
> Float )
> )
>
> mapper(Producto, productos_tabla , properties={'iva':relation(Iva)})
> mapper(Iva,iva_tabla)
>
>
> ----- And when i run it:
> raceback (most recent call last):
> File "/home/instancia_webware/MyContext/Pruebas/sql.py", line 29,
> in ?
> mapper(Producto, productos_tabla ,
> properties={'iva':relation(Iva)})
> File "/usr/lib/python2.4/site-packages/SQLAlchemy-0.4.1-py2.4.egg/
> sqlalchemy/orm/__init__.py", line 518, in mapper
> return Mapper(class_, local_table, *args, **params)
> File "/usr/lib/python2.4/site-packages/SQLAlchemy-0.4.1-py2.4.egg/
> sqlalchemy/orm/mapper.py", line 154, in __init__
> self._compile_properties()
> File "/usr/lib/python2.4/site-packages/SQLAlchemy-0.4.1-py2.4.egg/
> sqlalchemy/orm/mapper.py", line 612, in _compile_properties
> self._compile_property(column_key, column, init=False,
> setparent=True)
> File "/usr/lib/python2.4/site-packages/SQLAlchemy-0.4.1-py2.4.egg/
> sqlalchemy/orm/mapper.py", line 654, in _compile_property
> raise exceptions.ArgumentError("WARNING: column '%s' not being
> added due to property '%s'. Specify 'allow_column_override=True' to
> mapper() to ignore this condition." % (column.key, repr(prop)))
> sqlalchemy.exceptions.ArgumentError: WARNING: column 'iva' not being
> added due to property '<sqlalchemy.orm.properties.PropertyLoader
> object at 0xb7aba1cc>'. Specify 'allow_column_override=True' to
> mapper() to ignore this condition.
>
> ----------
> I've read a lot, and I can't or I'm incapable to resolve this by
> myself. Can anybody help me?
>
> Sorry again, Marcos
>
> >
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