RSpec::Matchers have_same_attributes_as

matchers.rb

RSpec::Matchers.define :have_same_attributes_as do |expected|
  ignored_attributes = ['id', 'updated_at', 'created_at']

  match do |actual|
    actual.attributes.except(*ignored_attributes) == expected.attributes.except(*ignored_attributes)
  end

  chain :except do |*attributes|
    ignored_attributes += attributes.map {|a| a.to_s}
  end
end

# Usage:
#   expect(patient).to have_same_attributes_as(patient_copy)
# It compares every attributes of the 2 models without taking ['id', 'updated_at', 'created_at'] into account
#
#   expect(patient).to have_same_attributes_as(patient_copy).except(:latitude, :longitude)
# It compares every attributes of the 2 models without taking ['id', 'updated_at', 'created_at', 'latitude', 'longitude'] into account