You're going to want to override a couple of ModelAdmin methods. Take a look
at this blog post.
http://www.b-list.org/weblog/2008/dec/24/admin/

On Tue, May 5, 2009 at 5:19 AM, topcoder...@gmail.com <topcoder...@gmail.com
> wrote:

>
> Hello everyone,
>
> In my application, I heavily used django.contrib.admin to manage my
> data, especially add/edit them. Now I need a quite customized
> validation feature added into it. Certain user may have no authority
> to edit some fields of some instances of a Model, and whether or not
> she/he can edit it depending on her/his user name, current system time
> and/or the field she/he attempts to edit.
>
> When user who has no authority attempts to edit something, she/he
> should received a user-friendly error message just like she/he entered
> invalid email address or leaved required field empty.
>
> How to hook this customized validation/authorization feature into
> admin site?
>
> Thanks a lot.
>
> >
>

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