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Counter Cache Column
Episode #23Apr 25, 200740 comments

Counter Cache Column

If you need to display the record count for a has_many association, you can improve performance by caching that number in a column. (7 minutes)
Eager Loading
Episode #22Apr 23, 200729 comments

Eager Loading

One way to improve performance is to cut down on the number of SQL queries. You can do this through eager loading. Learn all about it in this episode! (4 minutes)
Virtual Attributes
Episode #16Apr 09, 200734 comments

Virtual Attributes

Keep your controllers clean and forms flexible by adding virtual attributes to your model. This very powerful technique allows you to create form fields which may not directly relate to the database. (3 minutes)
Fun with Find Conditions
Episode #15Apr 06, 20079 comments

Fun with Find Conditions

You can pass more than simple strings to find conditions. Arrays, ranges, and nil values can be passed as well. In this episode you will see the tricks involved with passing these odd objects to find conditions. (Update: audio fixed). (4 minutes)
Performing Calculations on Models
Episode #14Apr 04, 20073 comments

Performing Calculations on Models

Did you know ActiveRecord provides class methods for performing calculations on models? You can even use these methods through associations. (2 minutes)
Using with_scope
Episode #5Mar 14, 20077 comments

Using with_scope

Learn how to use with_scope - a very powerful method which will allow your custom find methods to accept any find options. Just like magic! (2 minutes)
Move Find into Model
Episode #4Mar 12, 200710 comments

Move Find into Model

Move a find into the model to clean up the controllers and remove duplication. Also see how you can call these custom find methods through an association. (2 minutes)
Find Through Association
Episode #3Mar 08, 20075 comments

Find Through Association

No need to pass foreign keys in find conditions, just do the find through a has_many association. (2 minutes)
Dynamic find_by Methods
Episode #2Mar 06, 200714 comments

Dynamic find_by Methods

Shorten simple finds considerably and improve readability by using the dynamic find_all_by and find_by methods. (1 minute)