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RSpec::Matchers.define :match_ids do |*expected|
match do |actual|
actual_ids = map_ids(actual)
expected_ids = map_ids(expected)
expect(actual_ids).to match_array(expected_ids)
end
description do
'matches elements by ids'
end
failure_message do
actual_ids = map_ids(actual)
expected_ids = map_ids(expected)
"expected IDs #{actual_ids} in:\n\n #{actual.inspect}\n\nto match IDs #{expected_ids} in:\n\n #{expected.inspect}"
end
def map_ids(elements)
elements = elements.flatten if elements.respond_to?(:flatten)
if elements.respond_to?(:map)
elements.map(&:id)
elsif elements.respond_to?(:id)
[elements.id]
else
raise ArgumentError, "could not map elements to ids: #{elements}"
end
end
end
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