Question

以下是我正在使用的代码：

这是我的app/models文件：

class One < ActiveRecord::Base
  attr_accessible :name, :surname      
end

class Two < ActiveRecord::Base  
  attr_accessible :name, :one_surname

  # generate a list of one's surnames
  def self.LIST_SURNAMES
    list  = Array.new
    arr   = One.all
    arr.each {|one| list << one.surname}

    return list
  end

  validates :one_surname, :inclusion => self.LIST_SURNAMES()
end

这是我的/spec/models文件：

FactoryGirl.define do
  factory :two do
    name "two_name"
  end

  factory :one do
    name "one_name"
    surname "one_surname"
  end    
end

describe Two do
  it 'should be created' do
    @one = FactoryGirl.create(:one)

    puts "One.last.surname = #{One.last.surname}"
    puts "Two.LIST_SURNAMES = #{Two.LIST_SURNAMES}"

    @two = FactoryGirl.build(:two, :one_surname => Two.LIST_SURNAMES[0])

    @two.save!
  end
end

然而，我的测试失败了。而且我完全不确定为什么会这样。有什么想法吗？

这是RSpec输出：

One.last.surname  = one_surname
Two.LIST_SURNAMES = ["one_surname"]

此外，我遇到了这个失败：

  1) Two should be created
     Failure/Error: @two.save!
     ActiveRecord::RecordInvalid:
       Validation failed: One surname is not included in the list
 # ./category_spec.rb:29:in `block (2 levels) in <top (required)>'

Answer 1

它在解释时执行Two.LIST_SURNAMES，而不是运行时。因此，如果您希望它在运行时获取LIST_SURNAMES，则需要使用proc

validates :one_surname, :inclusion => {:in => proc {self.LIST_SURNAMES()}}

其余的是可选的，但是这里有一些清洁的代码：

class Two < ActiveRecord::Base
  attr_accessible :name, :one_surname

  validates :one_surname, :inclusion => {in: proc{One.pluck(:surname)}}                                              
end

我将LIST_SURNAMES方法替换为One.pluck(:surname)，它执行相同的操作。另外：LIST_SURNAMES，如果你保留它，应该是def self.list_surnames，因为它不是常数。

要检查的RSpec测试（Rails模型：验证：某事，：includes =＆gt;来自其他activeRecord的列表）

1 个答案: