@@ -0,0 +1,11 @@
+class AddVisitIdToCommentAndProposal < ActiveRecord::Migration
+  def up
+    add_column :proposals, :visit_id, :integer
+    add_column :comments, :visit_id, :integer
+  end
+
+  def down
+    drop_column :proposals, :visit_id
+    drop_column :comments, :visit_id
+  end
+end
can we also `add_foreign_key` here for some referential integrity?