vinjvinj ha scritto:
> Say I have a python class defined:
>
> def class User(object):
> get_calculated_field(self):
> return self.a_column_in_user_table_1 +
> self.a_column_in_additional_info
>
> user_table = Table('user_table', metadata, autoload=True)
> additional_info = Table('additional_info', metadata, autoload=True)
>
> Now I need to do the following:
>
> 1. Add an additional read only attribute to the User object which is
> calculated from columns on the user_table and additional_info table
>
> 2. Be able to generate a join between a user_table and additional_info
> table and then for each row that is returned by the db, have the User
> object add calculated_field as a read only attribute (by calling the
> function get_calculated_field)
>
Why additional_info isn't a property of user_table ?
properties = { 'additional_info' : relation(additional_info),
})
so you have:
a = user_table()
a.a_column_in_user_table_1 + a.additional_info.your_column
Glauco
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