Limit paid amount for JCB, Visa and Master Card

app/controllers/origami/master_controller.rb

@@ -2,6 +2,20 @@ class Origami::MasterController < BaseOrigamiController
 
   def index
     @sale_id = params[:sale_id]
+
+    # limit master_amount
+    sale_data = Sale.find_by_sale_id(@sale_id)
+    total = sale_data.grand_total
+    @mastercount = 0
+    others = 0
+    sale_data.sale_payments.each do |sale_payment|
+        if sale_payment.payment_method == "master"
+          @mastercount = @mastercount + sale_payment.payment_amount
+        else
+          others = others + sale_payment.payment_amount
+        end
+    end
+    @can_master = total - @mastercount - others
   end
 
   def create