On Tue, May 6, 2008 at 2:25 PM, Peter Bailey <[EMAIL PROTECTED]> wrote:
> > Hey alen. I have tried implementing this and it makes good sense as > far as I can see, but when I validate the model I always get an > AttributeError: 'NoneType' object has no attribute 'name'. > How are you validating the model? I have tried removing name from the definition of the class - same > message (not sure where it is getting 'name' from since I deleted it. > I also looked around and saw that some other have had similar > problems, and it seemed to be a string definition problem. So I put > back 'name' and changed it to an IntegerField - same unhappy result. > > Do you have any notion of what the problem is? The code looks right to > me. > It sounds like you have some code somewhere that is expecting to always be handed an instance of your model, and thus be able to access the field 'name', but it is in fact sometimes getting handed None. When handed None, it still tries to access 'name', but since None has no attribute 'name', you get the error. If you post the code someone could probably help pinpoint the error more specifically. Karen > > Thanks, > > Peter > > > On May 6, 1:33 pm, Peter Bailey <[EMAIL PROTECTED]> wrote: > > Thanks very much for your solution and reply alen. I'm learning the > > ins and outs of python and django at the same time - fun adventure - > > so far python is blowing me away - I love it. Better than anything I > > have used before - 3 assemblers,c, c++ java, vb, ruby, php, asp, etc > > (guess I am dating myself lol - most people don't seem to even ever > > have looked at assembler these days. I used to love it - 7 years of > > that after university) Oh, and of course C was always the bomb too :-) > > > > Thanks again, > > > > Peter > > > > On May 6, 12:46 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> > > wrote: > > > > > Define a 'abstract' attribute of Meta inner class and set it to true > > > like so: > > > > > class AbstractType(models.Model): > > > name = models.CharField(max_length=100) > > > > > class Meta: > > > abstract = True > > > > > class RadioBoxTypes(AbstractType): > > > radio_lable = models.CharField(max_length=20) > > > > > Regards, > > > -Alen > > > > > On May 6, 5:43 pm, Peter Bailey <[EMAIL PROTECTED]> wrote: > > > > > > I have designed a small db model (on paper) and want to implement it > > > > in my models.py file. So far, this has been pretty straight forward, > > > > but I have a generic superclass and several subclasses, and I am > > > > unsure how to implement this. > > > > > > My DB has page objects (webpages) with a few common attributes, and > a > > > > fk to an Item object. The item object is the generic superclass. It > > > > could be a RadioType, a CheckBoxType, a VerbatimType, etc. These all > > > > have attributes specific to themselves. > > > > > > Anyway, I don't grok how to set up this type of relationship in my > > > > models.py file. Is there a standard way of doing this, or does > anyone > > > > have an suggestions or can point me to some relevant info? > > > > > > e.g. Pages - pointed to by fk in Items > > > > ---------- > > > > > > Items - has key to one of the below > > > > -------- > > > > > > RadioBoxTypes CheckboxTypes VerbatimTypes etc > > > > ----------------------- ----------------------- > > > > --------------------- ---- > > > > > > Thanks very much. Sorry if this is a dumb question - always fun > being > > > > a newbie :-( > > > > > > Peter > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
