factory_girl: update

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Rico Sta. Cruz 2017-09-01 04:59:41 +08:00
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---
title: FactoryGirl
title: Factory Girl
category: Ruby libraries
layout: default-ad
layout: 2017/sheet
weight: -3
updated: 2017-09-01
---
## Factories
{: .-three-column}
FactoryGirl.define do
### Defining factories
```ruby
FactoryGirl.define do
factory :user do
first_name 'John'
last_name 'Doe'
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sequence(:username) { |n| "user#{n}" }
end
end
end
```
{: data-line="2"}
# Also available:
factory :user, class: 'User'
factory :user, aliases: [:author]
See: [Defining factories](http://www.rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md#Defining_factories)
## Using
### Extra options
FactoryGirl.build(:user)
```ruby
# Custom class names
factory :user, class: 'User' do
···
end
```
build(:user) # not saved
create(:user) # saved
attributes_for(:user) # hash
build_stubbed(:user) # stubbed out attributes
```ruby
# Aliases
factory :user, aliases: [:author] do
···
end
```
build(:user, name: 'John')
### Using
create_list(:user, 3)
build_list(:user, 3)
```ruby
FactoryGirl.build(:user)
```
```ruby
build(:user) # not saved
create(:user) # saved
attributes_for(:user) # hash
build_stubbed(:user) # stubbed out attributes
```
```ruby
# With options:
build(:user, name: 'John')
```
```ruby
# List:
create_list(:user, 3)
build_list(:user, 3)
```
## Associations
factory :post do
### Defining
```ruby
factory :post do
association :author, factory: :user
association :author, factory: [:user, :admin]
end
```
{: data-line="2,3"}
or:
```ruby
factory :post do
author # assumes there's a factory :author
end
end
```
### After-create hooks
factory :post do
```ruby
factory :post do
after :create do |post|
create :theme, post: post # has_one
create_list :comment, 3, post: post # has_many
end
end
end
```
{: data-line="2"}
## Traits
## Other features
{: .-three-column}
factory :user do
### Traits
```ruby
factory :user do
trait :admin do
admin true
end
end
end
```
{: data-line="2,3,4"}
create :user, :admin
```ruby
create :user, :admin
```
## Nested factories
Traits allow you to group attributes together.
See: [Traits](http://www.rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md#Traits)
factory :user do
### Nested factories
```ruby
factory :user do
first_name 'John'
factory :sample_user do
first_name { FFaker::Name.first_name }
end
end
end
```
{: data-line="4,5,6"}
# create :sample_user
```ruby
create :sample_user
```
# Also: factory :sample_user, parent: :user
See: [Inheritance](http://www.rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md#Inheritance)
## Options (transients)
### Sub-factories
factory :user do
```ruby
factory :user do
···
end
```
```ruby
factory :sample_user, parent: :user do
first_name { FFaker::Name.first_name }
end
```
{: data-line="1"}
```ruby
create :sample_user
```
Works the same as nested factories.
### Options (transients)
```ruby
factory :user do
transient do
upcased true
end
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after :create do |user, options|
user.name.upcase! if options.upcased
end
end
end
```
{: data-line="2,3,4"}
create(user, upcased: true)
```ruby
create(user, upcased: true)
```
## Paths
Transient attributes will not get passed to the model, but will be available in after-create hooks.
See: [Transient attributes](http://www.rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md#Transient_Attributes)
test/factories.rb
spec/factories.rb
test/factories/*.rb
spec/factories/*.rb
### Paths
* test/factories.rb
* spec/factories.rb
* test/factories/*.rb
* spec/factories/*.rb
Place your factories in these locations.
{: .-setup}
## See also
{: .-one-column}
* <http://rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md>