If you defined your association via class Article belongs_to "category" end and you try Article.scoped(:include => :category)
This describes all the steps you'll need to get Solr up and running for your project using the Sunspot...
Gem to get Rails 3's new ActiveRecord query interface (where, order) and the new scope syntax (chaining scope definitions...
Basically, you now need to know if your project uses a "real" time zone or :local, and if config.active_record.time_zone...
Seems like a useful gem for cases where ActiveRecord is overkill but you don't want to do everything by...
Using rename_column, remove_column, etc. more than once in a migration makes that migration run slower than it should...
Gem to generate entity relationship diagrams from your Rails 3 ActiveRecord models. The diagram style is pretty and configurable.
For performance improvements (and to remove the need for eager loading), the ActsAsTaggableOn gem supports caching your tag lists directly...
When you have objects in your database that hold latitude and longitude and you want to find others that are...
Instead of running all missing migrations on your test database with rake db:migrate RAILS_ENV=test you can also...
Note: This applies specifically to MySQL. In PostgreSQL for example, this is not an issue. If you care about performance...
First keep in mind that :dependent => :destroy hooks into before_destroy. So when you use other before_destroy callbacks the...
Given the problem you have a new column postion and that column should be updated for all existing rows with...
When adding a new field to your model's database table, don't set any defaults in the database.
Remember how Rails 2 came with an awesome feature that broke all code using Time.now or Time.parse? This behavior is...
Simple: Tell the application controller how to handle exceptions, here a RecordNotFound error. Do this with the following line: # application_controller.rb...
jQuery as new default Javascript library, streaming response support, attr_accessible with roles, prepared statements, easier migrations.
While it might seem trivial to implement an invoice that sums up items and shows net, gross and vat totals...
Did you return false in a before_validation callback?
I recently browsed through the ActiveSupport code and found some nice stuff I did not know about: ActiveSupport::Callbacks
When the Ruby parser module of Ruby-GetText comes across a file in one of its search directories (e.g. lib/scripts...
Note that this card is very old. You might want to use ActiveType for your auto-coerced virtual attributes instead...
(Rails has a method ActiveRecord::Relation#merge that can merge ActiveRecord scopes. However, its behavior has never been clear, and...
Put the attached file into config/initializers/ to be able to say created_within on any ActiveRecord or its scope chain...