Treating nil as zero in sum function

Question

I have a Seller model that has_many Items.

I want to get the total sale price of all of a Seller\'s items.

In seller.rb I have

def total_item         


        

Answer 1

items.map(&:sale_price).compact.sum

or

items.map(&:sale_price).sum(&:to_i)

Answer 2

Reject the nil values. items.to_a.reject{|x| x.sales_price.nil?}.sum(&:sale_price)

Answer 3

One way is:

items.to_a.sum { |e| e.sale_price.to_i } # or to_f, whatever you are using

Methods like #to_f and #to_i will turn nil into 0.