在Rails中使用SQL命令查找当前用户所在的所有位置。id在字符串中

In my app, there are a number of contributors to a post, with their id's stored in a string in the database. I'd like to find the total of posts where the user is listed as a contributor. I've put the following in my ApplicationController (before_filter'ed):In my app, there are a number of contributors t