Laravel 5: What's the best Eloquent Relationship for this relation? Tasks can have one Topic AND one Project AND one

I have three models:

Task Project Topic

A Task can be associated with a Project or a Topic or to both.

Is there any type of eloquent relationship that I can use to achieve this type of relation or do I have to use the Polymorphic Many to Many?

I don't want to use the standard belongsTo with foreign key because I might extend it to other models.

Thanks!

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