add functionality to choose column headers + order for custom csv and append order.sum gross&net to custom csv

app/lib/order_csv.rb

@@ -2,6 +2,8 @@ require 'csv'
 
 class OrderCsv < RenderCsv
   def header
+    params = @options[:custom_csv]
+    arr = if params.nil?
             [
               OrderArticle.human_attribute_name(:units_to_order),
               Article.human_attribute_name(:order_number),
@@ -11,19 +13,49 @@ class OrderCsv < RenderCsv
               ArticlePrice.human_attribute_name(:price),
               OrderArticle.human_attribute_name(:total_price)
             ]
+          else
+            [
+              params[:first],
+              params[:second],
+              params[:third],
+              params[:fourth],
+              params[:fifth],
+              params[:sixth],
+              params[:seventh]
+            ]
+          end
   end
 
   def data
     @object.order_articles.ordered.includes([:article, :article_price]).all.map do |oa|
       yield [
-        oa.units_to_order,
-        oa.article.order_number,
-        oa.article.name,
-        oa.article.unit,
-        oa.price.unit_quantity > 1 ? oa.price.unit_quantity : nil,
-        number_to_currency(oa.price.price * oa.price.unit_quantity),
-        number_to_currency(oa.total_price)
+        match_params(oa, header[0]),
+        match_params(oa, header[1]),
+        match_params(oa, header[2]),
+        match_params(oa, header[3]),
+        match_params(oa, header[4]),
+        match_params(oa, header[5]),
+        match_params(oa, header[6])
       ]
     end
   end
+
+  def match_params(object, attribute)
+    case attribute
+    when OrderArticle.human_attribute_name(:units_to_order)
+      object.units_to_order
+    when Article.human_attribute_name(:order_number)
+      object.article.order_number
+    when Article.human_attribute_name(:name)
+      object.article.name
+    when Article.human_attribute_name(:unit)
+      object.article.unit
+    when Article.human_attribute_name(:unit_quantity_short)
+      object.price.unit_quantity > 1 ? object.price.unit_quantity : nil
+    when ArticlePrice.human_attribute_name(:price)
+      number_to_currency(object.price.price * object.price.unit_quantity)
+    when OrderArticle.human_attribute_name(:total_price)
+      number_to_currency(object.total_price)
+    end
+  end
 end

app/lib/render_csv.rb

@@ -20,6 +20,7 @@ class RenderCsv
       end
       data { |d| csv << d }
     end
+    ret << I18n.t('.orders.articles.prices_sum') << ";" << "#{number_to_currency(@object.sum(:gross))}/#{number_to_currency(@object.sum(:net))}" if @options[:custom_csv]
     ret.encode(@options[:encoding], invalid: :replace, undef: :replace)
   end