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Joe Ferris 2008-06-06 11:46:39 -04:00
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= factory_girl
h1. factory_girl
written by Joe Ferris <jferris@thoughtbot.com>
thanks to Tammer Saleh, Dan Croak, and Jon Yurek of thoughtbot, inc.
Copyright 2008 Joe Ferris and thoughtbot, inc.
Written by "Joe Ferris":mailto:jferris@thoughtbot.com.
== Defining factories
Thanks to Tammer Saleh, Dan Croak, and Jon Yurek of thoughtbot, inc.
# This will guess the User class
Factory.define :user do |u|
u.first_name 'John'
u.last_name 'Doe'
u.admin false
end
Copyright 2008 Joe Ferris and thoughtbot, inc.
h2. Download
Github: "Page":http://github.com/thoughtbot/factory_girl/tree/master "Clone":git://github.com/thoughtbot/factory_girl.git
Gem: <pre>gem install thoughtbot-factory_girl --source http://gems.github.com</pre>
h2. Defining factories
<pre><code># 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</code></pre>
# 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'
<pre><code>require 'factory_girl'</code></pre>
== Lazy Attributes
h2. 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
@ -33,73 +43,83 @@ 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
<pre><code>Factory.define :user do |u|
# ...
u.activation_code { User.generate_activation_code }
end</code></pre>
== Dependent Attributes
h2. 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
<pre><code>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
# => "joe.doe@example.com"
Factory(:user, :last_name => 'Doe').email
# => "joe.doe@example.com"</code></pre>
== Associations
h2. 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
<pre><code>Factory.define :post do |p|
# ...
p.author {|author| author.association(:user, :last_name => 'Writely') }
end</code></pre>
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
<pre><code># 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
# Builds but does not save a User and a Post
Factory.build(:post)
post.new_record? # => true
post.author.new_record # => true</code></pre>
== Sequences
h2. 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
<pre><code># Defines a new sequence
Factory.sequence :email do |n|
"person#{n}@example.com"
end
Factory.next :email
# => "person1@example.com"
Factory.next :email
# => "person1@example.com"
Factory.next :email
# => "person2@example.com"
Factory.next :email
# => "person2@example.com"</code></pre>
== Using factories
# Build and save a User instance
Factory(:user)
h2. Using factories
# Build a User instance and override the first_name property
Factory.build(:user, :first_name => 'Joe')
<pre><code># Build and save a User instance
Factory(:user)
# Return an attributes Hash that can be used to build a User instance
attrs = Factory.attributes_for(: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)</code></pre>
h2. More Information
"Our blog":http://giantrobots.thoughtbot.com
"factory_girl rdoc":http://dev.thoughtbot.com/factory_girl