Delete only one associated record

I have 2 models with a hasMany/belongsTo relation. Let's say User/
Pictures: a user hasMany pictures and a picture belongs to a user.

I have a page where it is possible to enter data about the user and to
select pictures and enter data about them.
The problem: when I try to "edit" the data I can choose to remove one
or many pictures.
Is there a cake way to accomplish that?
If I simply remove the picture from the page and save cake doesn't
delete anything. Should I do that by hand, coding some code that
checks if the submitted data is different from the recorded data?

Thank you
maxx

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