unbind USER model inside the USER controller

Then, I have a User model and a Book Model I bind it as:
User HABTM Book
Book HABTM User

So I have books_users table inside my DB and CAKEPHP will
automatically create BooksUser virtual model.

Now if I want to know about a user's book collection I call method
getCollection inside User controller. This work QUITE perfectly and
will return me a data set like:
Array
(
[0] => Array
(
[BooksUser] => Array
(
[id] => 4ca75919
)

[Book] => Array
(
[id] => 6a915e32
[title] => the Dubliners
)

[User] => Array
(
[0] => Array
(
[id] => 4ca3183d
[BooksUser] => Array
(
[id] => 4ca75919
)

)
);

This return me what I need, but there is even [User] information.
Inside this array there will be all users that own that book, this
will mean a lot of unuseful information and a lot of unuseful load.
How can I unbind it?
The real problem is that I need to unbind model User from User
controller, I can do that? Otherwise, what can I do?

PS: I have thing to remove [User] using PHP unset() function. In this
way there will be less data send to view, but I think that simply
unbinding model will increase performance?

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