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...
When your cucumber features grow massively over time, the test execution can take a lot of time.
Asset pipeline, HTTP streaming, jQuery as default framework, auto-reversable migrations, identity map for ActiveRecord. Ruby 1.8.x support will...
Validations that need to access an associated object may lead to some trouble. Let's exemplify that using this example...
Occasionally you need to do something directly on the server -- like having all records recalculate something that cannot be done...
Ruby comes with a class BigDecimal which you can use for arbitrary precision arithmetic. You should use BigDecimal instead of...
When storing floating-point numbers such as prices or totals in an SQL database, always use a DECIMAL column. Never...
When deploying an application with "cap deploy" by default [1] you only deploy your code but do not run migrations...
Airbrake (formerly Hoptoad) already ignores certain errors like InvalidAuthenticityToken by default (see Airbrake::Configuration::IGNORE_DEFAULT).\ To ignore additional classes...
The Edge Rider gem will define a method collect_ids on your ActiveRecord models, scopes, integer scalars and collections, which...
ActiveRecord gives you the :include option to load records and their associations in a fixed number of queries. This is...
ActiveRecord models know how to cast a given string to the type of a given attribute (or column).
User.active.to_sql Rails 2 Use either the Edge Rider or fake_arel gem to get #to_sql backported...
Note: ActiveRecord::Base#becomes has a lot of quirks and inconsistent behavior. You probably want to use ActiveType.cast instead.
Sometimes you can make your life easier by not allowing a record attribute to be changed after the record was...
ActiveRecord comes with a method touch which sets the updated_at timestamp to the current time. Unfortunately it also runs...
The attached RSpec matcher exist_in_database checks if a given record still exists in the database and has not...
When you need to insert many records into the same table, performance may become an issue. What you can do...
You can find ActiveRecord models by using a Range as its conditions: User.scoped(:conditions => { :id => 3..5 }) This will generate...
You will occasionally need to clean out your database while keeping the schema intact, e.g. when someone inserted data in...
When you set both a record's association and that association's foreign key attribute, Rails does not realize you...