factory_girl
Written by Joe Ferris.
Thanks to Tammer Saleh, Dan Croak, and Jon Yurek of thoughtbot, inc.
Copyright 2008 Joe Ferris and thoughtbot, inc.
Download
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Gem:
gem install thoughtbot-factory_girl —source http://gems.github.com
Defining factories
# This will guess the User class
Factory.define :user do |u|
u.first_name 'John'
u.last_name 'Doe'
u.admin false
end
# This will use the User class (Admin would have been guessed)
Factory.define :admin, :class => User do |u|
u.first_name 'Admin'
u.last_name 'User'
u.admin true
end
It is recommended that you create a test/factories.rb file and define your
factories there. This file can be included from test_helper or directly from
your test files. Don’t forget:
require 'factory_girl'
Lazy Attributes
Most attributes can be added using static values that are evaluated when the
factory is defined, but some attributes (such as associations and other
attributes that must be dynamically generated) will need values assigned each
time an instance is generated. These “lazy” attributes can be added by passing
a block instead of a parameter:
Factory.define :user do |u|
# ...
u.activation_code { User.generate_activation_code }
end
Dependent Attributes
Some attributes may need to be generated based on the values of other
attributes. This can be done by calling the attribute name on
Factory::AttributeProxy, which is yielded to lazy attribute blocks:
Factory.define :user do |u|
u.first_name 'Joe'
u.last_name 'Blow'
u.email {|a| "#{a.first_name}.#{a.last_name}@example.com".downcase }
end
Factory(:user, :last_name => 'Doe').email
# => "[email protected]"
Associations
Associated instances can be generated by using the association method when
defining a lazy attribute:
Factory.define :post do |p|
# ...
p.author {|author| author.association(:user, :last_name => 'Writely') }
end
When using the association method, the same build strategy (build, create, or attributes_for) will be used for all generated instances:
# Builds and saves a User and a Post
post = Factory(:post)
post.new_record? # => false
post.author.new_record # => false
# Builds but does not save a User and a Post
Factory.build(:post)
post.new_record? # => true
post.author.new_record # => true
Sequences
Unique values in a specific format (for example, e-mail addresses) can be
generated using sequences. Sequences are defined by calling Factory.sequence,
and values in a sequence are generated by calling Factory.next:
# Defines a new sequence
Factory.sequence :email do |n|
"person#{n}@example.com"
end
Factory.next :email
# => "[email protected]"
Factory.next :email
# => "[email protected]"
Using factories
# Build and save a User instance
Factory(:user)
# Build a User instance and override the first_name property
Factory.build(:user, :first_name => 'Joe')
# Return an attributes Hash that can be used to build a User instance
attrs = Factory.attributes_for(:user)
New features in this fork branch
HashFactory(:user) is a shoutcut for Factory.attributes_for
Factory.define :post do |p|
# ...
p.description {|p| Factory.lorem }
end