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Migrating to PostgreSQL
Postgres is a feature-packed relational database that every Rails developer should consider using. Here you will learn how to install it, add it to a new application, and transition from an existing SQLite app using the "taps" gem.
(8 minutes)
Public Activity
Learn how to easily add a user activity feed using the public_activity gem. Here I show both the default setup using model callbacks and a manual way to trigger activities.
(10 minutes)
Tagging
There are several gems to help implement tags in a Rails app. Here I show you how to integrate acts-as-taggable-on and then show how to do it from scratch.
(11 minutes)
Active Record Reputation System
If you need to calculate an average user's rating or sum up a number of votes, consider using the activerecord-reputation-system gem. Here I will cover the basics and also briefly present a from-scratch solution.
(10 minutes)
Globalize3
Rails has great internationalization (I18n) support making it easy to translate static text into other languages, but how do we translate database content? Learn how using Globalize 3 in this episode.
(5 minutes)
Seed Data
Rails 2.3.4 includes a conventional way to add seed data to your application - no more including it in the migration files.
(7 minutes)
Nested Model Form Part 1
Handling multiple models in a single form is much easier with the accepts_nested_attributes_for method. See how to use this method to handle nested model fields.
(11 minutes)
Embedded Association
Learn how to set up a one-to-many or many-to-many association which is entirely embedded into a single column through a string or bitmask.
(14 minutes)
Validations in Rails 3
Rails 3 offers several new additions to validations. Here learn how to make a custom error_messages partial, reflect on validations, and clean up complex validations in a model.
(9 minutes)
Tableless Model
If you want to create a model without a database backend, you simply need to define a couple methods in the model like I show in this episode.
(8 minutes)