Undefined method or local variable with active merchant

Question

I have the following class method in my Product model that calculates total price within the basket:

def self.total_basket_price(basket)
    where(id: basket.to_a).sum(:price)
end

And i have this within my view:

<%= number_to_currency(Product.total_basket_price(basket)) %>

Both work as expected until i try to implement a purchase method in my Order model:

def purchase
response = GATEWAY.purchase(Product.total_basket_price(basket), credit_card, purchase_options)                                   
end

It throws out an undefined local variable or method on the (basket) above.

I can't see why the basket is undefined.

Answer 1

You are seeing this error, well, because there is no method or local variable basket in your model. So, either:

a) Define a method that returns the basket object:

def basket
  # some logic here to return basket.
end

b) Pass in the basket to your method:

def purchase(basket)
  response = GATEWAY.purchase(Product.total_basket_price(basket), credit_card, purchase_options)                                   
end

c) Or, if you are working within an instance of Basket, pass in the instance as self instead of basket.

  response = GATEWAY.purchase(Product.total_basket_price(self), credit_card, purchase_options)