code is getting executed when Django validates it's models. Hence,
Cartprobably has not been validated yet and it's model class is
None.
On Monday, February 11, 2013 4:29:44 PM UTC+5:30, vijay shanker wrote:
>
> hi
> i wrote a function for producing tuples of all model names, which is this:
> from django.contrib.contenttypes.models import ContentType
> from django.db.models.loading import get_model
>
> def get_all_models():
> return tuple([(each.__module__+'.'+each.__name__,each.__name__) for
> each in [each.model_class() for each in
> ContentType.objects.filter(app_label__in=['products','productoptions','shoppingcart'])
>
> if each is not None] if each is not None])
>
> when i run this in my shell it gives this output:
>
> (('shoppingcart.models.Cart', 'Cart'), ('shoppingcart.models.CartItem',
> 'CartItem'), ('shoppingcart.models.CartRule', 'CartRule'),
> ('products.models.CasesAccessory', 'CasesAccessory'),
> ('productoptions.models.Coating', 'Coating'),
> ('shoppingcart.models.ConditionSet', 'ConditionSet'),
> ('products.models.Eyeglass', 'Eyeglass'), ('products.models.GiftVoucher',
> 'GiftVoucher'), ('productoptions.models.Lens', 'Lens'),
> ('productoptions.models.Prescription', 'Prescription'),
> ('products.models.Readingglass', 'Readingglass'),
> ('products.models.Sunglass', 'Sunglass'), ('productoptions.models.Tint',
> 'Tint'), ('productoptions.models.Vision', 'Vision'))
>
> while at choices my first option got lost and output is:
>
> (('shoppingcart.models.CartItem', 'CartItem'),
> ('products.models.CasesAccessory', 'CasesAccessory'),
> ('productoptions.models.Coating', 'Coating'), ('products.models.Eyeglass',
> 'Eyeglass'), ('products.models.GiftVoucher', 'GiftVoucher'),
> ('productoptions.models.Lens', 'Lens'),
> ('productoptions.models.Prescription', 'Prescription'),
> ('products.models.Readingglass', 'Readingglass'),
> ('products.models.Sunglass', 'Sunglass'), ('productoptions.models.Tint',
> 'Tint'), ('productoptions.models.Vision', 'Vision'))
>
> why did this happened and whats the fix ?
>
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