On 20 avr, 16:03, Gaetan de Menten <[email protected]> wrote:
> On Mon, Apr 20, 2009 at 15:42, KLEIN Stéphane <[email protected]>
> wrote:
> > what do you think about "abstract" entity option like Abstract base
> > classes feature in Django ORM (http://docs.djangoproject.com/en/dev/
> > topics/db/models/#id6) ?
>
> > I need this feature, if you think it is useful feature, I going to
> > work on.
>
> You can already have a similar behavior by using a custom base
> class:http://elixir.ematia.de/trac/browser/elixir/trunk/tests/test_customba...
>
> The only shortcoming I know of for this approach is that you can't
> have an abstract entity which inherits from a non-abstract one, but I
> don't think this is very useful in practice.
This is a working dirty example (http://pypaste.com/
4ApPiBlwAHHcNJ6JNQPOSw) :
::
from elixir import *
metadata.bind = 'sqlite:///test.db'
class BaseA(object):
field_a = Field(Unicode())
class AbstractA(BaseA):
__metaclass__ = EntityMeta
class AbstractB(BaseA):
__metaclass__ = EntityMeta
field_b = Field(Unicode())
class C(AbstractB):
field_c = Field(Unicode())
class D(AbstractB):
field_d = Field(Unicode())
class E(AbstractA):
field_e = Field(Unicode())
if __name__ == '__main__':
setup_all()
create_all()
This is what I would like (http://pypaste.com/
2f7cBSGCSiIsku6ZDDM0vU) :
::
from elixir import *
metadata.bind = 'sqlite:///test.db'
class AbstractA(Entity):
using_options(abstract = True)
field_a = Field(Unicode())
class AbstractB(Entity):
using_options(abstract = True)
field_b = Field(Unicode())
class C(AbstractB):
field_c = Field(Unicode())
class D(AbstractB):
field_d = Field(Unicode())
class E(AbstractA):
field_e = Field(Unicode())
if __name__ == '__main__':
setup_all()
create_all()
In my personal stuff, I've many generic model with multi inheritance.
This is why I need this feature.
What do you think about this 'using_options(abstract = True)'
feature ?
Regards,
Stephane
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