How to force modelForm.is_valid() to use a specific database?

I have many database setted in my setting.py   in my formModel, when I try to validate the form, show me error:

http://stackoverflow.com/questions/17797419/modelforms-and-multiple-datasbase-error-in-form-is-valid

The problem is.. is_valid is going to "default" database... how can I force to got to another database?

Thanks.

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