Hi,
A question that's probably obvious but I can't quite see the best way to do
it.
I've got a model, call it Template, with some fields colour1, colour2 etc.
What I want is that if there's a no value for the colourN field then a
default value is returned when the field is read.
Aha I hear you say, just use
class Template(models.Model):
colour1 = models.CharField(default = "red")
However, as far as I can tell this only fills in a default value when the
object is first created. I've got two problems with that:
1) these are new fields on the model, and I've got a whole pile of existing
records where these are going to be blank. Setting default="red" in the
model doesn't seem to fix that.
2) I do want people to be able to set a colour in the admin, change their
minds, set it to blank and have the original colour restored.
Boiling it down, I want a way to make the colour1 field work like this:
def _get_colour1(self):
if self.value == '':
return self.default_value
else:
return self.value
I can't spot an obvious way to do this - what have I missed?
Thanks,
Malcolm
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