When Paperclip attachments should only be downloadable for selected users, there are three ways to go. The same applies to...
In modern Rails versions you can also use ActiveRecord's pluck method. User.active.pluck(:id) => [1, 5, 23, 42]
You should test the callback methods and its correct invocation in two separate tests. Understand the ActiveRecord note before you...
When you load a record with find options that have SQL fragments in :select or :joins, ActiveRecord will make that...
Sometimes you want to fetch associations for an ActiveRecord that you already loaded, e.g. when it has deeply nested associations...
When working with times and dates in Rails applications, you need to deal with the following problem: In Rails, Time...
jamesgolick / resource_controller at Github module ResourceController module Actions def index load_collection before :index response_for :index end
Ruport’s acts_as_reportable module provides support for using ActiveRecord for data collection. You can use it to get...
This method is defined automatically and only given for boolean attributes create_table "users", :force => true do |t| t.boolean "email...
Ancestry is a gem/plugin that allows the records of a Ruby on Rails ActiveRecord model to be organised as a...
To test concurrent code, you will need to run multiple threads. Unfortunately, when you use blocking system calls (e.g. locks...
Install gem and plugin sudo gem install parallel script/plugin install git://github.com/grosser/parallel_tests.git Adapt config/database.yml test: database: xxx_test<%= ENV...
before transition before validation after validation before save after save after transition Aborting the callback chain See Cancel the ActiveRecord...
Squirrel is an enhancement for ActiveRecord’s find method that allows programmers to query the database using a more Rubyish...
Cache Money is a plugin for ActiveRecord that transparently provides write-through and read-through caching functionality using Memcached. With...
Finish the remainder of the ActiveModel todo list (observers, callbacks, validations, scoping, and serialization) in addition to associations. Also wire...
Record Filter gives you the full power of ActiveRecord's query building tools with a heaping helping of DSL thrown...
Capistrano recipes for database backups before migrations, passenger deployment strategy, release tagging in Git repos.
The idea behind scrooge is both surprisingly simple and powerful: instead of forcing the developer to manually specify each attribute...
A rails plugin to store a collection of boolean attributes in a single ActiveRecord column as a bit field.
Rails 2.3 has a ton of really nice functionality locked up in monolithic components. I’ve posted quite a bit...
All ActiveRecord associations except for has_many :through support callbacks for pre- and post-insertion/deletion via the following, self...
Just assign the existing attachment to another record: new_photo = Photo.new new_photo.image = old_photo.image Paperclip will duplicate the file when saving...