diff --git a/depot/db/migrate/20100122061534_create_line_items.rb b/depot/db/migrate/20100122061534_create_line_items.rb
index 6870a05..4052e58 100644
--- a/depot/db/migrate/20100122061534_create_line_items.rb
+++ b/depot/db/migrate/20100122061534_create_line_items.rb
@@ -1,10 +1,10 @@
 class CreateLineItems < ActiveRecord::Migration
   def self.up
     create_table :line_items do |t|
-      t.integer :product_id
-      t.integer :order_id
-      t.integer :quantity
-      t.decimal :total_price
+      t.integer :product_id, :null => false, :options => "CONSTRAINT fk_line_item_products REFERENCES products(id)"
+      t.integer :order_id, :null => false, :options => "CONSTRAINT fk_line_item_orders REFERENCES orders(id)"
+      t.integer :quantity, :null => false
+      t.decimal :total_price, :null => false, :precision => 8, :scale => 2
 
       t.timestamps
     end