在两个ruby on rails应用程序之间共享一个数据库

I have an existing sqlite database from an existing ror application, and would like to set up a new rails app simply so my users can only view records in the db. How can I set up a scaffold linked to my existing db. The db name is as default "development.sqlite3" and has one table called "library". this table is for showing images in a slideshow.(only contains paperclip type value for image and the automatically generated id.)I have an existing sqlite database from an exis