How To Restrict Logged In Users To Only Their Profile

I have a User and Profile controller in an application I am working
on.In my model files a User hasOne profile and a Profile belongsTo a
User.

The problem I am having is that if a logged in user wants to edit his
profile he can eidt other Users profile just by changing the value of
id in the link. Example /profiles/edit/1 where 1 is the id of the
user. I would like to know how to prevent this so that a user can only
edit his profile only.

WOuld also like to know if there is a way to eidt a profile or user
details without passing the value of the id. SO instead of a user
visiting /profiles/edt/1 ot edit his profile he should visit profiles/
edit instead.

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