应允许空白 validate_uniqueness_of

Question

使用应该，任何想法如何在进行此测试时允许空白：

should validate_uniqueness_of(:email)

谢谢。

Answer 1

我已经想通了！！ validate_uniqueness_of 依赖于您当前在数据库中的第一条记录上测试的属性的值。因此，如果数据库中的第一条记录恰好为空白或该属性的 nul，您的测试将始终给出如下错误：“失败/错误：it { should validate_uniqueness_of(:customer_number).case_insensitive.scoped_to(:user_id) }当 customer_number 设置为 nil 时，预期错误包括“已被采取”，没有错误”。

那么我们该如何解决这个问题呢？确保删除所有现有记录，并且第一条记录包含填充的属性值。

型号：

validates_uniqueness_of :customer_number, :scope => :user_id, :case_sensitive => false, :allow_blank => true, :allow_nil => true

型号规格：

describe 'Validation' do

  it { should allow_value('').for(:customer_number) }

  describe 'When a user exists with the same customer_number and user' do
    before(:each) do 
      Customer.destroy_all
      # Saving a single customer to validate uniqueness.
      @existing = Factory(:customer, :customer_number => 'test') # If you leave customer_number blank here the matcher will check if it can save a new record with a blank customer_number which is possible since we allow blanks. So make sure your first record has a filled in value!!
    end

    subject do
      Factory.build(:customer)
    end

    it { should validate_uniqueness_of(:customer_number).case_insensitive.scoped_to(:user_id) }
  end
end

希望这可以解决一些人的问题:)

Answer 2

should allow_value(" ").for(:email)
should allow_value(nil).for(:email)

Answer 3

或许

should validate_uniqueness_of(:email, :allow_blank => true)