> -----Original Message-----
> From: sqlalchemy@googlegroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of svilen
> Sent: Friday, August 31, 2007 12:40 PM
> To: sqlalchemy@googlegroups.com
> Subject: [sqlalchemy] Re: advice on modifying uniqueobject recipe
>
>
> On Friday 31 August 2007 19:12:20 Orest Kozyar wrote:
> > I'm fairly new to Python so am still learning about metaclasses. I
> > think I pretty much understand how the uniqueobject recipe at
> > http://www.sqlalchemy.org/trac/wiki/UsageRecipes/UniqueObject
> > works, and is precisely what I'm looking for.
> >
> > Since I'd like to use this recipe with a number of
> tables/objects in
> > my database, I am trying to figure out how to make this recipe more
> > generic.
> >
> > For example, let's say I have the following objects:
> >
> > class user(object):
> > __metaclass__ = EntitySingleton
> > def __init__(self, firstname, lastname):
> > pass
> >
> > class pet(object):
> > __metaclass__ = EntitySingleton
> > def __init__(self, owner, species):
> > pass
> >
> > I changed __call__ method in EntitySingleton to accept an argument
> > list so it can *args. I tried changing it to **kwargs so I could
> > pick up the names of the variables (such as "firstname" and
> use that
> > to filter the query with) but that gave me an error.
> what error and why?
When I create an instance using pet('Jack', 'dog'), I get the following
error:
__call__() takes exactly 1 argument (3 given)
If I change it to pet(name='Jack', species='dog'), it works just fine.
Orest
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