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    Add Operation Hooks to a LoopBack model


    In this lesson we will learn how to add operation hooks to our models. In the Product model we will create a before safe observer that will check if the category we want to add the product to exists.

    In our Category model we will create a before delete observer to prevent categories from being deleted when they have products.

    We will create a unit test to verify that both of these operation hooks work as expected.