我如何测试validate_uniqueness_of？

Question

我遇到了精神障碍。谁能向我解释如何为validate_uniqueness_of编写规格测试？

Answer 1

或使用Shoulda：

before do
  @user = Factory(:user)
end

subject { @user }

it { should validate_uniqueness_of(:name) }

Answer 2

class Foo < ActiveRecord::Base
  validates_uniqueness_of :name
end

# spec
describe Foo do
  it "should have a unique name" do
    Foo.create!(:name=>"Foo")
    foo = Foo.new(:name=>"Foo")
    foo.should_not be_valid
    foo.errors[:name].should include("has already been taken")
  end
end

Answer 3

使用Shoulda使其更短：

it "validates uniqueness of name" do
  FactoryGirl.create(:tag, name: 'unique name')
  should validate_uniqueness_of(:name)
end

Answer 4

class User < ActiveRecord::Base
  validates_uniqueness_of :name
end


it "should validate uniqueness of name" do
  user1 = FactoryGirl.create(:user)
  user1.save
  user2 = FactoryGirl.build(:user)
  expect { user2.save! }.to raise_error(
    ActiveRecord::RecordInvalid
  )      
end

Answer 5

如果您遵循rubocops ImplicitExpect，则可能会使用如下所示的内容：

it { is_expected.to validate(%i[name], uniqueness: { scope: :user_group_id }) }

或

it { is_expected.to validate_uniqueness_of(:name).scoped_to(:user_group_id) }