使用特定于 gem 的方法运行自定义验证

Question

我设置了一个自定义验证，用于在提交评论之前检查用户是否为专辑投票。验证在客户端运行良好，但在运行我的 Rspec 测试时，我似乎遇到了一些问题。

验证使用 Acts As Votable gem 的 voted_for? 方法。不幸的是，这就是事情变得糟糕的地方。对于我的非自定义验证（顺便说一句，它经常工作）我收到这样的错误：

  3) Review validations should ensure body has a length of at least 40
     Failure/Error: it { should validate_length_of(:body).is_at_least(40) }
     NoMethodError:
       undefined method `voted_for' for nil:NilClass

我需要做什么才能识别此方法？

审查模型

class Review < ActiveRecord::Base
  belongs_to :album
  belongs_to :owner, class_name: "User", foreign_key: :user_id

  validates :body, presence: true, length: { minimum: 40 }

  def album_vote
    if !owner.voted_for?(album)
      errors.add(:review, "requires an album vote before submitting")
    end
  end
end

审核工厂

FactoryGirl.define do
  factory :review do
    body { Faker::Lorem.paragraph(2) }

    album
    association :owner, factory: :user
  end
end

Answer 1

您需要确保确实存在所有者。该错误只是因为您调用的是 nil 并且与 ActsAsVotable 没有任何关系。

class Review < ActiveRecord::Base
  belongs_to :album
  belongs_to :owner, class_name: "User", foreign_key: :user_id
  validates :body, presence: true, length: { minimum: 40 }
  validates :owner, presence: true

  def album_vote
    # consider raising an error if there is no owner.
    if owner && !owner.voted_for(album)
      errors.add(:review, "requires an album vote before submitting")
    end
  end
end

然后更改您的工厂定义以创建所有者：

FactoryGirl.define do
  factory :user, aliases: [:owner] do
    # ...
  end
end

FactoryGirl.define do
  factory :review do
    body { Faker::Lorem.paragraph(2) }
    album
    owner
  end
end