How to test for (ActiveRecord) object equality

Question

In Ruby 1.9.2 on Rails 3.0.3, I\'m attempting to test for object equality between two Friend (class inherits from ActiveRecord::

Answer 1

I created a matcher on RSpec just for this type of comparison, very simple, but effective.

Inside this file: spec/support/matchers.rb

You can implement this matcher...

RSpec::Matchers.define :be_a_clone_of do |model1|
  match do |model2|
    ignored_columns = %w[id created_at updated_at]
    model1.attributes.except(*ignored_columns) == model2.attributes.except(*ignored_columns)
  end
end

After that, you can use it when writing a spec, by the following way...

item = create(:item) # FactoryBot gem
item2 = item.dup

expect(item).to be_a_clone_of(item2)
# True

Useful links:

https://relishapp.com/rspec/rspec-expectations/v/2-4/docs/custom-matchers/define-matcher https://github.com/thoughtbot/factory_bot