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I included the final version of the PurchaseHandler service class towards the end of the post. I removed the #credit_card attr_reader as it wasn't being used. The #purchase attribute is set in the #create_purchase method.
Also keep in mind that the code for actually creating a purchase is not described here and isn't totally relevant--just an example to illustrate how we can use some of these super helpful Active Model modules :)
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Glad you found it helpful!
I included the final version of the
PurchaseHandlerservice class towards the end of the post. I removed the#credit_cardattr_reader as it wasn't being used. The#purchaseattribute is set in the#create_purchasemethod.Also keep in mind that the code for actually creating a purchase is not described here and isn't totally relevant--just an example to illustrate how we can use some of these super helpful Active Model modules :)