It may make debugging a little harder, but it gives you a lot more
flexibility in constructing objects.
Here's a factoryish method I wrote for testing:
def create_teacher(textbook = None,
user = None,
start_state = None,
explain_state = None,
practice_state = None,
finish_state = None,
best_module = None,
best_question = None,
mediator = None,
current_state = None):
teacher = Teacher()
teacher.textbook = textbook or create_textbook()
teacher.user = user or create_user()
start_state = start_state or create_start_state()
teacher.start_state = start_state
teacher.explain_state = explain_state or create_explain_state()
teacher.practice_state = practice_state or create_practice_state()
teacher.finish_state = finish_state or create_finish_state()
teacher.best_module = best_module or create_best_module()
teacher.best_question = best_question or create_best_question()
teacher.mediator = mediator or create_mediator()
teacher.current_state = start_state
teacher.save()
return teacher
Now, I'm not saying I couldn't have initialized it in one line (with
or without local variables), but it is pretty readable this way.
On Oct 10, 6:39 am, Chris Withers <ch...@simplistix.co.uk> wrote:
> Hi All,
>
> Assuming this model:
>
> class Month(models.Model):
> month = models.DateField(
> db_index=True,
> verbose_name='Month'
> )
> def __unicode__(self):
> return unicode(self.month.strftime('%B %Y'))
>
> Now, I could have sworn this used to throw an error if I did:
>
> m = Month()
>
> ...because I haven't supplied a required field. But it no longer seems
> to do so until .save() is called.
>
> Am I imagining things?
>
> This behaviour is suboptimal, here's an example why using the above model:
>
> >>> Month()
> Traceback (most recent call last):
> File "models.py", line 65,
> in __unicode__
> return unicode(self.month.strftime('%B %Y'))
> AttributeError: 'NoneType' object has no attribute 'strftime'
>
> :-(
>
> Chris
>
> --
> Simplistix - Content Management, Batch Processing & Python Consulting
> -http://www.simplistix.co.uk
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