[Rails] Depot application and some changes

hi,

i want to Modify the depot application so that clicking on an image of
an item
in the catalogue adds that item to the shopping cart.
the Second thing is to Change the application so that the cart
smoothly blinds up when the
user empties it.
last, is to Add a link next to each item in the shopping cart that
enables a user
to decrement the quantity of the item. When the quantity reaches zero,
the item should be removed from the shopping cart.

so could you guys help me as soon as u can to do that cuz i couldn't
do it

Regards

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