Ruby on Rails array .include? only check for reference and not object content?

Question

I am trying to assert that an array of objects contains an expected object. However even though the array indeed contains the expected object (at least from my eyes they do), the spec test kept failing and said the array does not include the object.

Here's the test:

bubble_dtos = [...]
expected_bubble = ...
expect(bubble_dtos).to include(expected_bubble)

And here's the test result:

Failure/Error: expect(bubble_dtos).to include(expected_bubble)
expected [<Soda::DTO::Bubble container_id=594, bubble_type="co2", flavor_id=3515, bubble_sid="soda::bubble:dbid/1413", id=1413, desc="desc1">, <Soda::DTO::Bubble container_id=594, bubble_type="co2", flavor_id=3519, bubble_sid="soda::bubble:dbid/1414", id=1414, desc="desc2">, <Soda::DTO::Bubble container_id=594, bubble_type="co2", flavor_id=3528, bubble_sid="soda::bubble:dbid/1421", id=1421, desc="desc3">] to include <Soda::DTO::Bubble container_id=594, bubble_type="co2", flavor_id=3528, bubble_sid="soda::bubble:dbid/1421", id=1421, desc="desc3">

Does array .include? only check object reference and not object content?

I couldn't find anything in the docs, but it looks that it checks only object reference. How do you feel about using include(an_object_having_attributes(...))? — João Fernandes
– João Fernandes, Commented Sep 11, 2021 at 14:23
If you want to compare 2 different object with the same content, I think you can implement the equality in the object: rubyguides.com/2017/03/ruby-equality — JCorcuera
– JCorcuera, Commented Sep 11, 2021 at 14:54

roo · Accepted Answer · 2021-09-12 03:17:23Z

1

Per the ruby 2.7 docs:

include?(object) → true or false

Returns true if the given object is present in self (that is, if any element == object), otherwise returns false.

If your DTO doesn't implement the equality operator == then it will use Object#== which only compares the object reference.

To add the operator to your class:

def ==(object)
  # handle different type
  return false unless object.is_a?(Soda::DTO::Bubble)

  # compare internal variables etc.
  object.container_id == self.container_id
end

edited Sep 12, 2021 at 3:17

answered Sep 12, 2021 at 3:11

roo

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