Index: db/migrate/005_tags_photos.rb
===================================================================
--- db/migrate/005_tags_photos.rb	(revision 0)
+++ db/migrate/005_tags_photos.rb	(revision 0)
@@ -0,0 +1,13 @@
+class TagsPhotos < ActiveRecord::Migration
+  def self.up
+    create_table :tags_photos, :id => false do |t|
+      t.integer :tag_id
+      t.integer :photo_id
+      t.timestamps
+    end
+  end
+
+  def self.down
+    drop_table :tags_photos
+  end
+end