Inventory Receipt Ruby

I need to create an inventory list as an invoice with a button on a show page. You will work on my github folder that contains my ruby on rails app. You will access to the app as administrator and you will need to go to the dashboard where you can see a list of contracts. When you go on the show page of the contract you will have a list of inventory items. I want to be able to generate a .pdf as receipt for this list from a button on this page.

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