Kris questions

Kris answers

• combining data to 1 model attribute
• Rails3 - How To Render 403 in before_filter w/o DoubleRender Error
• Can you DROP TABLE IF EXISTS by specifying database name with table?
• list Rails controller instance variables
• Rails 3 routing and multiple domains
• HTTP is statel-less,so what does it mean by keep-alive?
• Rails: How to add add_index to existing table
• What is the original meaning of P and V operations in a context of a semaphore?