fix chain_record methods

app/models/invoice.rb

@@ -218,6 +218,7 @@ class Invoice < ActiveRecord::Base
 
   def chain_record
     self.footprint = compute_footprint
+    save!
   end
 
   def check_footprint

app/models/invoice_item.rb

@@ -8,6 +8,7 @@ class InvoiceItem < ActiveRecord::Base
 
   def chain_record
     self.footprint = compute_footprint
+    save!
   end
 
   def check_footprint

lib/tasks/fablab/setup.rake

@@ -6,20 +6,14 @@ namespace :fablab do
     task chain_invoices_records: :environment do
       raise "Footprints were already generated, won't regenerate" if Invoice.where.not(footprint: nil).count.positive?
 
-      Invoice.order(:created_at).all.each do |i|
-        i.chain_record
-        i.save!
-      end
+      Invoice.order(:created_at).all.each(&:chain_record)
     end
 
     desc 'assign all footprints to existing InvoiceItem records'
     task chain_invoices_items_records: :environment do
       raise "Footprints were already generated, won't regenerate" if InvoiceItem.where.not(footprint: nil).count.positive?
 
-      InvoiceItem.order(:created_at).all.each do |i|
-        i.chain_record
-        i.save!
-      end
+      InvoiceItem.order(:created_at).all.each(&:chain_record)
     end
 
     desc 'assign environment value to all invoices'