Rspec 使用范围验证唯一性

Question

I have this in my Line model

validates :home_team, :uniqueness => { :scope => [:visiting_team, :event_datetime],
:message => "** DOUBLE EVENT **" }  

I have this in my spec

describe Line do
  it { should validate_uniqueness_of(:home_team).scoped_to(:visiting_team, :event_datetime) }  

I get this error...

Failures:

1) Line 
 Failure/Error: 

it { should validate_uniqueness_of(:home_team).scoped_to(:visiting_team, :event_datetime) }
   Did not expect errors to include "has already been taken" when home_team is set to "arbitrary_string", got error: 
# ./spec/models/line_spec.rb:7:in `block (2 levels) in <top (required)>'

Any ideas why this is failing?

Answer 1

I think you need to do this make it pass

it { should validate_uniqueness_of(:home_team).scoped_to(:visiting_team, :event_datetime).with_message("** DOUBLE EVENT **") }

The default error message of uniqueness is “has already been taken”.

Answer 2

In case you follow rubocops ImplicitExpect you might what to use something like this:

it { is_expected.to validate(%i[home_team], uniqueness: { scope: [:visiting_team, :event_datetime] }) }

or

it { is_expected.to validate_uniqueness_of(:home_team).scoped_to(:visiting_team, :event_datetime) }

(note that I did not include the custom error message as the original question is very old and my purpose is to help visitors from google rather than the original question author)

Answer 3

Using the New "Expect" Lingo

let(:line) { build(:line) } # if using factory bot, or you could use fixtures
it {expect(line).to validate_uniqueness_of(:home_team).scoped_to(:visiting_team, :event_datetime)  }