rspec 3.0 belongs_to association

Question

I'm trying to test a belongs_to association using rspec 3.0 but I keep running into the error

NoMethodError: undefined method `belong_to' for RSpec::Core

  it "should belong to a user" do
ride = Ride.new
user = User.new
user.rides << ride
expect(ride).to belong_to user

end

I can't find anything in the documentation for rspec 3.0 to test advanced associations. Help please!

rspec doesn't have anything built in to test associations like that. Are you looking for a gem like `shoulda-matchers`? https://github.com/thoughtbot/shoulda-matchers — sevenseacat, Jun 27 '14 at 01:48
Don't think shoulda-matchers works with Rspec 3.0 just yet - I ended up using respond_to instead. Thanks anyway! — user2635088, Jun 28 '14 at 13:45

score 1 · Accepted Answer · answered Jul 03 '14 at 16:39

You can simply check the association:

it "belongs to a user" do
  ride = Ride.new
  user = User.new
  user.rides << ride
  expect(ride.user).to be user
end

In this context, the be matcher verifies object identity. So this will pass if and only if the user object has the same object_id. In this case, that is what you want and is semantically meaningful with how it is read.

score 1 · Answer 2 · edited May 23 '17 at 11:53

1

shoulda-matchers is the gem that provides association, validation, and other matchers.

Look at this answer: Testing associations with rspec-rails 3.0.1 and shoulda doesn't work

edited May 23 '17 at 11:53

Community

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answered Oct 20 '14 at 11:27

Fran Martinez

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score 0 · Answer 3 · answered Jun 28 '14 at 13:47

0

I ended up using

expect(ride).to respond_to :user

answered Jun 28 '14 at 13:47

user2635088

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well that doesn't test that the association exists - just that the instance will respond to the method symbol `:user`. – sevenseacat Jun 29 '14 at 13:22

rspec 3.0 belongs_to association

3 Answers3