Malcolm Tredinnick wrote:
> The reason you are getting the same values all the time is because the
> random.randint(1,1000) and time.time() calls are being evaluated when
> the CharFiueld instance is created, which is at your model *class*
> creation time (i.e. import time, essentially). Not when you create a
> model instance.
>
> What you want is to pass in a callable for the default value (not the
> result of calling the callable, which is what you are doing now). See
> http://www.djangoproject.com/documentation/models/field_defaults/ for an
> example.
>
> Another way to do this would be to create the value as part of your
> save() method, if it was dependent on other things. But for a simple
> thing like time.time, just using a callable default will do.
>
> Realise that for your random.randint case, you will need to create a
> function that returns a new value in the range when it is called. You
> could use
>
> lambda: random.randint(1, 1000)
>
> and it should work.
>
> Regards,
> Malcolm
Thanks for the clue, it's quite obvious to me now but this morning 5am
it wasn't, especially because the admin interface didn't give me always
the same random/unique values. I think that might have been caused by
the different python processes - I was running django behind
apache/fcgi. But now everything is clear:
from time import time
from random import WichmannHill
class Tester(models.Model):
timetest1 = models.CharField( maxlength=20, default=time )
timetest2 = models.CharField( maxlength=20, default=time() )
rangetest1 = models.CharField( maxlength=5,
default=lambda:WichmannHill().randint(0,10000) )
rangetest2 = models.CharField( maxlength=5,
default=WichmannHill().randint(0,10000) )
class Meta:
db_table = 'test'
class Admin:
pass
def __str__(self):
return self.timetest1
# python manage.py syncdb
Creating table test
#python manage.py shell
>>> from myproject.myapp.models import Tester
>>> for i in range(0,50):
... e = Tester()
... e.save()
produces unique values for timetest1 and rangetest1 but same values for
timetest2 and rangetest2. obviously.
not so if creating records through the admin (apache/fcgi and must be 5
processes):
timetest2, rangetest2
1154602130.49, 44216
1154602118.07, 70639
1154602122.32, 70880
1154602125.78, 57792
1154602133.45, 59665
1154602130.49, 44216
1154602118.07, 70639
1154602122.32, 70880
1154602125.78, 57792
1154602133.45, 59665
1154602125.78, 57792
...
thanks again,
bernie
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