[Rails] One form, multiple models, custom validation

Hi everyone,

I hope someone can help me solve this problem.
I have a model called Project with :has_many => :tasks. In the new
Project form i allow the creation of 1 to n tasks on the fly thanks to
accepts_nested_attributes_for, where the task model has some validations
that block the creation of the new project if the required fields are
not correct.

This works just fine as it is supposed to work, but here's the problem:

At least one task needs to have some fields not empty, otherwise the
project should not be created. It can be any of the tasks but it's
imperative that at least one of them has those attributes, for the other
tasks these attributes are not required.
Is there a way of doing that without strange hacks?

Thanks in advance for your help

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