ruby-on-rails-3 - 工厂女孩序列不增加

Question

我试图让 FactoryGirl 为我生成一些名字，但序列似乎没有增加。

# spec/factories/vessel.rb
require 'factory_girl'
FactoryGirl.define do

  sequence :vessel_name do |n|
    "TK42#{n}"
  end

  factory :vessel do
    name FactoryGirl.generate(:vessel_name)
    vessel_type 'fermenter'
    volume_scalar 100.0
    volume_units 'bbl'
  end
end

# spec/models/vessel_spec.rb
require 'spec_helper'

describe Vessel do

  context 'working in the factory' do

    it 'makes a valid vessel' do
      vessel = FactoryGirl.create(:vessel)
      vessel.should be_valid, "Invalid vessel #{vessel.valid? || vessel.errors.messages.inspect}"
    end

    it 'makes another valid vessel' do
      vessel = FactoryGirl.create(:vessel)
      vessel.should be_valid, "Invalid vessel #{vessel.valid? || vessel.errors.messages.inspect}"
    end

  end

end

规范输出是

Vessel
  working in the factory
    makes a valid vessel
    makes another valid vessel (FAILED - 1)

Failures:

  1) Vessel working in the factory makes another valid vessel
     Failure/Error: vessel = FactoryGirl.create(:vessel)
     ActiveRecord::RecordInvalid:
       Validation failed: Name has already been taken
     # ./spec/models/vessel_spec.rb:13:in `block (3 levels) in <top (required)>'

# app/models/vessel.rb
class Vessel < ActiveRecord::Base

  attr_accessible :name, :vessel_type, :volume_scalar, :volume_units

  validates :name, :presence => true, :uniqueness => true

end

0 HAL:0 work/nrb-brewery-management % bundle show factory_girl_rails rspec
/home/brundage/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl_rails-3.5.0
/home/brundage/.rvm/gems/ruby-1.9.3-p0/gems/rspec-2.11.0

0 HAL:0 work/nrb-brewery-management % rails c test
Loading test environment (Rails 3.2.6)
1.9.3p0 :001 > FactoryGirl.generate :vessel_name
 => "TK422" 
1.9.3p0 :002 > FactoryGirl.generate :vessel_name
 => "TK423" 
1.9.3p0 :003 > FactoryGirl.generate :vessel_name
 => "TK424" 
1.9.3p0 :004 > FactoryGirl.generate :vessel_name
 => "TK425" 

为什么 FactoryGirl 不在我的规范中生成一系列名称？

Answer 1

这有效，这意味着您不能在规范中的任何地方覆盖名称，因为 after build Hook 将始终运行并覆盖任何名称。

您的原始示例不起作用的原因是您在定义工厂时调用序列，而不是在运行工厂时调用。您可以为属性定义提供一个块，每次工厂运行时都会调用该块。这样，您就有机会为每个实例生成一个值，而不是为所有实例生成一个值。这最常用于序列和时间。

您可以使用以下代码段修复原始示例:

sequence :vessel_name do |n|
  "TK42#{n}"
end

factory :vessel do
  name { generate(:vessel_name) }
  vessel_type 'fermenter'
  volume_scalar 100.0
  volume_units 'bbl'
end

如果所有名称都可以用相同的格式生成，您也可以通过重命名序列来完全省略该值:

sequence :name do |n|
  "TK42#{n}"
end

factory :vessel do
  name
  vessel_type 'fermenter'
  volume_scalar 100.0
  volume_units 'bbl'
end

但是，如果您需要为不同的工厂使用不同的名称格式，这将不起作用。