Hello, the subject expresses my discomfort with certain python
characteristics, given my background, and my lack of python knowledge.
Specifically lets say that I have a model with a Text field and char field.
The char field is length 1 and says "use or do not use the text field". The
char field can have Y or N values.
So using the admin interface I wanted to override the clean method but I
did not want to write
if text.__len__==0 and char=='Y':
raise exception
In C/C++ you would use enum for these sort of things. So I ended with
defining in models.py something as:
TO_USE= (
('Y', 'Yes'),
('N', 'No'),
)
class X(models.Model):
txt= models.CharField(db_index=True,null=True, blank=True,max_length=30)
use_txt=
models.CharField(blank=False,max_length=1,default='D',choices=TO_USE)
and in admin.py something as
class XForm(forms.ModelForm):
def clean(self):
cleaned_data=super(XForm, self).clean()
txt= cleaned_data['txt'].strip()
use_txt=cleaned_data['use_txt'].strip()
if txt.__len__()==0 and use_txt==TO_USE.__getitem__(0)[0]:
raise forms.ValidationError('This is needed!')
return cleaned_data
The part .__getitem__(0)[0] is not very readable. I have looked for enums
in python, and if I have understood well, it seems they are not implemented.
What is the best way to do it in python for my problem, given that I do not
want to write =='Y'.
Thanks
Nenad
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