Shoulda无法正确验证区分大小写的唯一

Question

使用shoulda和FactoryGirl来测试模型验证。

厂

FactoryGirl.define do 
    factory :tag do 
    value { Faker::Lorem.word } 

    user 
    end 
end 

标签型号

class Tag < ApplicationRecord 
    validates :value, 
      presence: true, 
      uniqueness: { case_sensitive: false } 

    belongs_to :user 
    has_and_belongs_to_many :cards 
end 

标签规格

RSpec.describe Tag, type: :model do 
    describe 'validations' do 
    it { should validate_presence_of(:value) } 
    it { should validate_uniqueness_of(:value) } 
    end 

    describe 'associations' do 
    it { should belong_to(:user) } 
    # it { should have_and_belong_to_many(:cards) } 
    end 
end 

我收到以下错误，当运行测试，

Failures: 

    1) Tag validations should validate that :value is case-sensitively unique 
    Failure/Error: it { should validate_uniqueness_of(:value) } 

     Tag did not properly validate that :value is case-sensitively unique. 
     After taking the given Tag, setting its :value to ‹"an arbitrary 
     value"›, and saving it as the existing record, then making a new Tag 
     and setting its :value to a different value, ‹"AN ARBITRARY VALUE"›, 
     the matcher expected the new Tag to be valid, but it was invalid 
     instead, producing these validation errors: 

     * value: ["has already been taken"] 
     * user: ["must exist"] 
    # ./spec/models/tag_spec.rb:6:in `block (3 levels) in <top (required)>' 
    # -e:1:in `<main>' 

Answer 1

测试case_insensitive正确的方法是使用下面的匹配，

it { should validate_uniqueness_of(:value).case_insensitive }