>
> http://docs.djangoproject.com/en/1.2/ref/models/fields/#unique

Although this does help, it leaves one question open:

How can we forbid only such pairs of objects that have the same value
in all of their attributes.

Example:

This should be allowed:

car1: manufacturer = "foo", name = "bar"
car2: manufacturer = "foo", name = "baz"

This should not be allowed:

car1: manufacturer = "foo", name = "bar"
car2: manufacturer = "foo", name = "bar"


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