threadlocals, created_by and save problem

[Ganesh KM]

Hi,

    i am using http://code.djangoproject.com/wiki/CookBookThreadlocalsAndUser to automatically add updated_by and created_by info,

class Entry(models.Model):
    name = models.CharField('name', maxlength=100)
    content = models.TextField('content')
    created_by = models.ForeignKey(User, related_name='entry_owner', blank=True)
    updated_by = models.ForeignKey(User, related_name='entry_last_updated', blank=True)
   
    class Admin:
        fields = ((None, { 'fields': ('name', 'content')}),)

it works when the object is created for the first time, but when i try to update the entry, it is giving a ProgrammingError because of the sql created_by_id=NULL since it is never shown in Admin fields.
presently i am using this hack to get around the error,

    def save(self):
        if self.id:
            self.created_by = Entry.objects.get(id= self.id).created_by
            self.updated_by = threadlocals.get_current_user()

is there any other approach like disabling updating the created_by_id field once the object is created ?

cheers,
Ganesh.

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