将org_document_comment中的title改成text类型

db/migrate/20151120115137_changecolumn_of_org_document_comments.rb

@@ -0,0 +1,8 @@
+class ChangecolumnOfOrgDocumentComments < ActiveRecord::Migration
+  def up
+    change_column :org_document_comments, :title, :text
+  end
+
+  def down
+  end
+end