#14638: to_python howto documentation improvement
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Reporter: maraujop | Owner: nobody
Status: new | Milestone:
Component: Documentation | Version: SVN
Resolution: | Keywords: to_python, model, field
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by maraujop):
* cc: muchoch...@gmail.com (added)
Comment:
I don't think docs are correct or I'm missing something. I have tried
different subclasses and in all of them {{{ to_python }}} gets called
before assigning a value to the field. {{{ to_python }}} is the method in
charge of converting the value to the expected python type to see if it
can be assigned.
I have put prints in my own DecimalField to see when they were being
called. I haven't seen {{{ to_pỳthon }}} been called to convert data
returned by the DB never. Here is the code of my subclass:
{{{
class Test(models.DecimalField):
def to_python(self, value):
print "to_python"
if value is None:
return value
try:
return decimal.Decimal(value)
except decimal.InvalidOperation:
raise
exceptions.ValidationError(self.error_messages['invalid'])
def __unicode__(self):
print "__unicode__"
return self.to_python()
}}}
The code is the same used in DecimalField. So I'm doing something wrong or
{{{ to_python }}} does not work as the docs say.
Thanks, regards
--
Ticket URL: <http://code.djangoproject.com/ticket/14638#comment:2>
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