delete HATBM relation

Hi,

I'd like to delete HATBM relation between a Person and a Contract.
The HATBM relationship is declared in the Person model and works fine
for retreiving the right person with all its contracts for example.
How should I submit things to my controller method in term of
data[ ? ] to just delete the relationship keeping contract ?
I don't understand how to structure the data array on the client side
(view).

Thanks !

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