How to make a basket with one item and one quantity?

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Philip Gavrilov2018-05-04 13:47:52

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Philip Gavrilov, 2018-05-04 13:47:52

There are a dozen items in the store. But you can put in the basket only one and in one quantity. If you add any other product, it replaces the one that was previously in the cart.
Thus, the cart can either be empty, or one product in the amount of 1. How to implement this?
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