How can I set a default value on a ForeignKey field in a django Model or AdminModel?
Something like this (but of course this doesn't work)...
created_by = models.ForeignKey(User, default=request.user)
See this blog post. Your question isn't clear as to whether you want the user to be able to override the default selection - if you do, then this might not be of much use.
There's also this blog post, which talks about auto-populating foreign key fields, but again, this is talking about non-overridable methods for setting the value of a foreign key field.