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# frozen_string_literal: true
# Assert all the given foreign keys are indexed:
#
# ```
# composite_foreign_keys = [['build_id', 'partition_id']]
# indexed_columns = [['build_id', 'name', 'partition_id'], ['partition_id', 'build_id', 'name']]
# expect(composite_foreign_keys).to be_indexed_by(indexed_columns)
# ```
#
RSpec::Matchers.define :be_indexed_by do |indexed_columns|
match do |composite_foreign_keys|
composite_foreign_keys.all? do |composite_foreign_key|
indexed_columns.any? do |columns|
# for example, [build_id, partition_id] should be covered by indexes e.g.
# - [build_id, partition_id, name]
# - [partition_id, build_id, name]
# but not by [build_id, name, partition_id]
# therefore, we just need to take the first few columns (same length as composite key)
# e.g. [partition_id, build_id] of [partition_id, build_id, name]
# and compare with [build_id, partition_id]
(composite_foreign_key - columns.first(composite_foreign_key.length)).blank?
end
end
end
end
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