Rails 5 Prawn pdf show total table values - ruby-on-rails

Question

In my view I have
<h4><%= number_to_currency #grand_total, precision: 0, unit: "EUR ", separator: "," %></h4>
This shows a correct total for a column. #grand_total is defined in my controller and it's the sum of total defined in model.
My model
class Ticketline < ActiveRecord::Base
belongs_to :ticket, :foreign_key => 'TICKET'
belongs_to :product, :foreign_key => 'PRODUCT'
def discount
(self.AMOUNT - self.TOTAL)
end
def total_amount
( pricesell = self.try(:PRICESELL) || 0
units = self.try(:UNITS) || 0
pricesell * units)
end
def total
(
price = self.try(:PRICE) || 0
units = self.UNITS || 0
price * units)
end
def consignor_cost
cost = product.location.try(:DISCOUNT_CONSIGNOR) || 0
cost ? (self.total * cost) : 0
end
def cost_of_goods_sold
cost = product.PRICEBUY || 0
cost ? (cost * self.TOTALUNITS) : 0
end
def gross_profit
(self.total - self.consignor_cost - self.cost_of_goods_sold)
end
class ProductSale < Ticketline
end
end
My controller
class ProductSalesController < TicketlinesController
def index
params.permit!
#q = Ticketline.joins(:product, :product => :location).group(:PRODUCT, :TICKET, :DISCOUNT_CONSIGNOR).select("PRODUCT, DISCOUNT_CONSIGNOR, UNITS, TICKET, SUM(ticketlines.PRICESELL*UNITS) AS AMOUNT, SUM(PRICE*UNITS) AS TOTAL, PRICE, UNITS, ticketlines.PRICESELL, SUM(UNITS) AS TOTALUNITS").ransack(params[:q])
#product_sales = #q.result.paginate(:page => params[:page], :per_page => 30)
#product_salesnp = #q.result
#amount_total = #q.result.map(&:total_amount).sum
#discount_total = #q.result.map(&:discount).sum
#grand_total = #q.result.map(&:total).sum
#consignor_cost_total = #q.result.map(&:consignor_cost).sum
#cost_of_goods_sold_total = #q.result.map(&:cost_of_goods_sold).sum
#gross_profit_total = #q.result.map(&:gross_profit).sum
respond_to do |format|
format.html
format.pdf do
pdf = SalesByProductPdf.new(#product_salesnp)
pdf.render_file "report.pdf"
send_data pdf.render, filename: 'report.pdf', type: 'application/pdf', disposition: 'inline'
end
end
end
end
On the pdf generated by prawn I want to show the same so I tried to enter on the corresponding pdf.rb file:
class SalesByProductPdf < Prawn::Document
include ActionView::Helpers::NumberHelper
def initialize(product_sales)
super()
#product_sales = product_sales
header
text_content
table_content
footer
end
def header
#something
end
def text_content
#something
end
def table_content
#something
end
def footer
text number_to_currency(grand_total, precision: 0, unit: "EUR ", separator: ",")
end
end
which gives me no error but shows no value.
What is the correct syntax?

Answer 1

You can explicitly include the ActionView::Helpers::NumberHelper module or whatever module you want in your prawn file.
Try passing in the #grand_total instance variable in your pdf file's initialize method:
class SalesByProductPdf < Prawn::Document
include ActionView::Helpers::NumberHelper
def initialize(product_salesnp, grand_total)
super()
#product_salesnp = product_salesnp
#grand_total = grand_total
header
text_content
table_content
footer
end
...
def footer
text number_to_currency(#grand_total, precision: 0, unit: "EUR ", separator: ",")
end
end
And pass in #grand_total in your controller too when you create a new Pdf object:
format.pdf do
pdf = SalesByProductPdf.new(#product_salesnp, #grand_total)
pdf.render_file "report.pdf"
send_data pdf.render, filename: 'report.pdf', type: 'application/pdf', disposition: 'inline'
end
Hopefully that should work..