#18478: Field.get_default will stringify everything that isn't a callable
-------------------------------+--------------------
Reporter: enrico | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.4
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I'm using a JSON-encoded field that can take any python data structure as
default, this way:
{{{
info = fields.ContactInfoField("Contact info", blank=True,
default={"a":u"I ♥ Django"})
}}}
and found out that I was getting {{{"{'a': u'I \\u2665 Django'}"}}} as a
default value in my model objects.
I tracked it down to Field.get_default, which stringifies all non-
callables:
{{{
def get_default(self):
"""
Returns the default value for this field.
"""
if self.has_default():
if callable(self.default):
return self.default()
return force_unicode(self.default, strings_only=True)
if (not self.empty_strings_allowed or (self.null and
not
connection.features.interprets_empty_strings_as_nulls)):
return None
return ""
}}}
Indeed this works as expected:
{{{
info = fields.ContactInfoField("Contact info", blank=True,
default=lambda:{{"a":u"I ♥ Django"})
}}}
I cannot understand the reason for the different treatment of values and
callables, and comments don't help. Field documentation does not mention
this behaviour either. From what little I can understand, this looks like
a bug,
--
Ticket URL: <https://code.djangoproject.com/ticket/18478>
Django <https://code.djangoproject.com/>
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