Add total to producer emails

app/mailers/producer_mailer.rb

@@ -6,6 +6,7 @@ class ProducerMailer < Spree::BaseMailer
     @order_cycle = order_cycle
     @line_items = aggregated_line_items_from(@order_cycle, @producer)
     @receival_instructions = @order_cycle.receival_instructions_for @producer
+    @total = total_from_line_items(@line_items)
 
     subject = "[#{Spree::Config.site_name}] Order cycle report for #{producer.name}"
 
@@ -49,4 +50,8 @@ class ProducerMailer < Spree::BaseMailer
       lis
     end
   end
+
+  def total_from_line_items(aggregated_line_items)
+    Spree::Money.new(aggregated_line_items.values.map(&:display_amount).reduce(:+)).to_s
+  end
 end

app/views/producer_mailer/order_cycle_report.text.haml

@@ -15,6 +15,9 @@ Here is a summary of the orders for your products:
 - @line_items.each_pair do |variant, line_item|
   #{variant.sku} - #{raw(variant.product.supplier.name)} - #{raw(variant.product_and_full_name)} (QTY: #{line_item.quantity}) @ #{line_item.single_money} = #{line_item.display_amount}
 \
+\
+Total: #{@total}
+\
 Thanks and best wishes,
 #{@coordinator.name}
 #{@coordinator.address.address1}, #{@coordinator.address.city}, #{@coordinator.address.zipcode}

spec/mailers/producer_mailer_spec.rb

@@ -62,6 +62,10 @@ describe ProducerMailer do
     mail.body.should_not include p3.name
   end
 
+  it "includes the total" do
+    mail.body.should include 'Total: $20.00'
+  end
+
   it "sends no mail when the producer has no orders" do
     expect do
       ProducerMailer.order_cycle_report(s3, order_cycle).deliver