WorkbenchWeb.Router.Helpers.product_path

You're seeing just the function product_path, go back to WorkbenchWeb.Router.Helpers module for more information.
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product_path(conn_or_endpoint, action)

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product_path(conn_or_endpoint, action, params)

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product_path(conn_or_endpoint, action, venue, id)

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product_path(conn_or_endpoint, action, venue, id, params)