ruby-on-rails - 如何测试 rspec shoulda 以在 Rails 中进行自定义验证？

Question

我的模型中有一个私有方法，如下所示：

  validate :record_uniq

  private
  def record_uniq
    if record_already_exists?
      errors.add(:base, "already exists")
    end
  end

  def record_already_exists?
    question_id = measure.question_id
    self.class.joins(:measure).
    where(measures: {question_id: ques_id}).
    where(package_id: pack_id).
    exists?
  end

这种方法更像是uniqueness防止重复记录的作用域。我想知道如何 validate :record_uniq使用shouldaor编写测试rspec？

我试过的例子：

describe Foo do
  before do
    @bar = Foo.new(enr_rds_measure_id: 1, enr_rds_package_id: 2)
  end

  subject { @bar }

  it { should validate_uniqueness_of(:record_uniq) }
end

Answer 1

简单 - 构建一个验证失败的对象，对其进行验证，并验证是否设置了正确的错误消息。

例如（如果您有一个名为 City 的模型）：

it 'validates that city is unique' do
  city = City.new # add in stuff to make sure it will trip your validation
  city.valid?
  city.should have(1).error_on(:base) # or 
  city.errors(:base).should eq ["already exists"]
end

Answer 2

这是我使用 RSpec 3 语法要做的事情。

it 'validates that city is unique' do
  city = City.new('already taken name')
  expect(city).to be_invalid
  expect(city.errors[:base]).to include('already exists')
end