Question

I’m generating invoice PDFs on the fly, and using my model to calculate the totals. For example:

 def cost
    jobs.inject(0) do |sum, job|      
      sum + job.cost
    end
  end

When generating my invoice I want the following in currency:

 pdf.text "Invoice Total: $#{number_to_currency(cost)}"

But when I attempt to use the number_to_currency helper in order to display the calculated values as currency, I get errors. Any advice on how/where to accomplish this? Thanks.

Answer 1

If you are calling the code from within your model, you will need to include the helper as they are not included in ActiveRecord::Base.

So, you might have something like this in your model code:

has_many :jobs

include ActionView::Helpers

def cost
  jobs.inject(0) do |sum, job|      
    sum + job.cost
  end
end

def generate_pdf
  ...

 pdf.text "Invoice Total: $#{number_to_currency(cost)}"
end