#154 Polymorphic Association (revised)
May 19, 2012 | 11 minutes | Active Record, Routing
A polymorphic association allows a model to belong_to different types of other models. Here I show how to make a single comment model belong to articles, photos, and events.
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Model Caching (revised)
Caching at a low level is a great option when the view is too dynamic to cache and you need something flexible that can work anywhere in the application. Here I show a variety of ways to use Rails.cache with Active Record.
(12 minutes)
Handling Exceptions (revised)
By default, Rails will render a static error file when an exception occurs in production. Here you will learn how to fully customize this behavior and render dynamic error pages.
(11 minutes)
Performance Testing
Learn how to add performance tests that automate benchmark and profile reports. Here I show how to find the bottlenecks to optimize a page. I also show how to compile Ruby with gcdata to get information about memory usage.
(16 minutes)
Eager Loading (revised)
One way to improve performance is to reduce the number of database queries through eager loading. Here I demonstrate this and compare the difference between the "includes" and "joins" methods.
(7 minutes)
Edit Multiple (revised)
Editing one record at a time can be tedious work. Here you will learn three different ways to edit multiple records at once using checkboxes.
(15 minutes)
