Question

我无法理解，如何正确使用带有Rspec的before_validation回调。

模型/ category.rb

class Category < ActiveRecord::Base 
    validates_presence_of :name, :permalink
    before_validation :generate_permalink

    private
    def generate_permalink
        self.permalink = Russian.translit(name).parameterize if permalink.blank?
    end
end

category_spec.rb

describe Category do
    it { should validate_presence_of(:name) }   
    it { should validate_presence_of(:permalink) }
    it "should generate permalink" do
        category = build(:category, name: "Category name", permalink: "")
        category.valid?
        category.permalink.should eq "category-name" 
    end
end

和 factories / categories.rb

FactoryGirl.define do
  factory :category do
    name "Category name"
    permalink "category-name"
  end
end

前两次测试我得到了错误：

undefined method `scan' for nil:NilClass

Answer 1

您可以检查实例的验证，而不是类本身：

it "should be invalid without a name" do
  category = build(:category, name: "some name", permalink: "some link")
  expect{ category.name = nil }.to change{ category.valid? }.to false
end

验证代码中的固定链接是否过多。 before_validation回调将在验证之前为永久链接提供非空值。这就是永久性验证永远不会失败的原因。

如何使用rspec与before_validation

1 个答案: