active_record serialize_matcher: undefined method 'serialize' about shoulda-matchers

[gabebw]

Hi, what's your subject set to in this spec?

[andreapavoni]

At first, I tried with implicit subject, then I've used:

describe Newsletter do
  let(:newsletter) { Factory :newsletter }
  subject { newsletter } # explicit subject

  # ...

  it { should serialize(:event_ids).as(Array) }

  # ...
end

In both cases, it didn't work. Other tests worked with implicit subject.

[gabebw]

What about this?

context "validations" do
  subject { Newsletter.new }
  it { should serialize(:event_ids).as(Array) }
end

You can also do this:

describe Newsletter do
  it "serializes event_ids as an Array" do
    Newsletter.new.should serialize(:event_ids).as(Array)
  end
end

[andreapavoni]

same error :-/

[gabebw]

Do other matchers work? Like it { should have_many(:whatevers) }?

[andreapavoni]

yes, I have a bunch of these in same file:

describe "associations" do
  it { should belong_to(:banner) }
end

describe "number" do
  it { should validate_presence_of(:number) }
  it { should validate_numericality_of(:number) }
end # number

they all work as expected.

[danielstockton]

I also have this issue (shoulda 3.0.1)

[halogenandtoast]

This is because the serialize matcher isn't currently in shoulda-matchers 1.0.0 which is the last one released as a gem. If you want to use the serialize matcher now you can do this:

group :test do
  gem 'rspec-rails'
  gem 'shoulda-matchers', git: "https://github.com/thoughtbot/shoulda-matchers"
  gem 'shoulda', '3.0.1'
end

Or wait until we cut the next release of shoulda which should be using the latest shoulda-matchers