diff --git a/db/migrate/20130626152300_add_product_categories_block_to_enterprises.rb b/db/migrate/20130626152300_add_product_categories_block_to_enterprises.rb
new file mode 100644
index 0000000..9b6131c
--- /dev/null
+++ b/db/migrate/20130626152300_add_product_categories_block_to_enterprises.rb
@@ -0,0 +1,18 @@
+class AddProductCategoriesBlockToEnterprises < ActiveRecord::Migration
+  def self.up
+    Enterprise.find_each do |enterprise|
+      enterprise.boxes << Box.new while enterprise.boxes.length < 2
+      enterprise.boxes[1].blocks << ProductCategoriesBlock.new
+    end
+  end
+
+  def self.down
+    Enterprise.find_each do |enterprise|
+      enterprise.boxes.each do |box|
+        box.blocks.each do |block|
+          block.destroy if block.class == ProductCategoriesBlock
+        end
+      end
+    end
+  end
+end
--
libgit2 0.21.2