Intro to Active Record

Aug 31, 2015Download as PPTX, PDF0 likes368 views

ActiveRecord is an object-relational mapping (ORM) pattern that allows developers to interact with a database using objects. It establishes a one-to-one relationship between classes and database tables, with each class representing a database table and objects representing table rows. ActiveRecord provides methods for easily creating, reading, updating, and deleting records in the database. It also handles associations between models and allows chaining conditions to build queries before executing them against the database.

An Introduction to
ActiveRecord
OmbuLabs, August 2015

Active Record is a design pattern
“An object that wraps a row in a database
table, encapsulates the database access, and
adds domain logic on that data.”
http://www.martinfowler.com/eaaCatalog/activeRecord.html

One class per table (usually)
Rails Model
class User < ActiveRecord::Base
end
Database
CREATE TABLE `users` (
`id` int(11) NOT NULL auto_increment,
`login` varchar(255),
`email` varchar(255),
`updated_at` datetime default NULL,
`created_at` datetime default NULL,
PRIMARY KEY (`id`)
)

The ActiveRecord we know
app/models/user.rb
class User < ActiveRecord::Base
end
Creating a user
> user = User.new(email: “example@example.com”)
# the user doesn’t exist in our database yet. ALL Ruby
classes have the `new` method.
> user.save!
SQL (14.1ms) INSERT INTO `users` (`email`) VALUES
(‘example@example.com’)
# user is now saved to the database.
> User.create(email: “example@example.com”)
SQL (14.1ms) INSERT INTO `users` (`email`) VALUES
(‘example@example.com’)

The ActiveRecord we know
app/models/user.rb
class User < ActiveRecord::Base
end
Loading a user
> user = User.find(1)
User load (0.00514) SELECT * FROM users WHERE
(users.id = 1) LIMIT 1
=> #<User id: 1, email: “example@example.com”>

Associations
1 to 1
has_one & belongs_to
1 to n
has_many & belongs_to
n to n
has_and_belongs_to_many
has_many :through

What can AR return?
ActiveRecord can return a single object, an array
of objects, or an Active Relation, among others.
User.find(1) => # Single object
User.first => # Single object
User.last => # Single object
User.all => # Array of objects
User.count => # Integer
User.where(id: 1) => # Active Relation

$Active Relations & Scopes You can chain conditions before hitting the database by using `joins`, `where`, `order` and scopes. class User < ActiveRecord::Base scope :not_real, -> { where(“email like ?”, “%example.com%”) } end > User.not_real => #<User id: 1, email: “example@example.com”> > User.not_real.where(id: 2) => []$

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Testing 101: Three Rules for Testing at Ombu Labs Ombu Labs, The Lean Software Boutique

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