Videos tagged with has_one

In this episode you will learn how to use options_from_collection_for_select when you have a has_one relationship between ActiveRecord objects. Note: For create, I was looking at the wrong book because the id was higher than the one we were looking at. (I had created some books before the screencast)

Summary Ever wonder just how Rails declarations such as "has many" and "belongs_to" work? Ever wished you could write your own code that worked the same way? It turns out that this style of programming, often called metaprogramming, is easier than you might think. In this talk we'll see how Ruby's open classes, compile-time execution, and full meta-object model make it easy ...

In this episode I will continue where I left off in episode 33 on self join basics. You will learn one way of solving the self join problem.

Learn the basics of self join. This screencast will show you the sql query for self join and how you can use has_one association in Rails.