Re: Populating a model field with an implicit default values with request data from the admin interface

Hi,

On Wed, Jan 27, 2010 at 4:30 AM, Ian <spidaman@gmail.com> wrote:
> Sorry about the noob questions, I'm digging through the docs... that
> was perfect, thanks!

You're welcome, but I have less than a month of Django experience
myself, so take my help with a grain of salt :)

> Only issue was: I had to set the created_by and updated_by fields to
> blank=True in the model to defeat the validator, even though the
> semantics are that they shouldn't be blank (seems hacky, is there a
> better way?).

I suspect that you might be looking to do something like this:

class Article(models.Model):
title = models.CharField(max_length=31)
blurb = models.CharField(max_length=255)
created_by = models.CharField(max_length=31, editable=False)
created_at = models.DateTimeField(auto_now_add=True, editable=False)
updated_by = models.CharField(max_length=31, editable=False)
updated_at = models.DateTimeField(auto_now=True, editable=False)

class ArticleAdmin(models.ModelAdmin):
def save_model(self, request, obj, form, change):
if change:
obj.updated_by = request.user.username
else:
obj.created_by = request.user.username
obj.save()

So the timestamps would be set and updated automatically, and you set
the created_by/updated_by fields depending on whether the form
submission was an add or a change. One possible catch is that
editable=False means that those fields would not show up in the
article's form (and so blank=True would not be required, if I remember
correctly), though you can make them show up in the article listing in
the admin.

Regards,
Eugene Wee

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