unique constraint

hi,
I am using a form to capture user entered values of urls to websites.I
need to create a model with
fields
1.url-charfield

2.creator_of_entry-foreignkey(User)

I am taking the creator as the logged in user,and can get his name.

I need to restrict the user from entering the same url again.How do I
do that?I was thinking of specifying creator_of_entry.username+url as
unique.How do I do this in django?

Also,there is the case of 2 different people with same name.I would
very much like some pointers as to how this can be tackled.If someone
can advise ,please do
thanks,
mark

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