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# frozen_string_literal: true
module Gitlab
module Graphql
module Pagination
module Keyset
# This class handles the last(N) ActiveRecord call even if a special ORDER BY configuration is present.
# For the last(N) call, ActiveRecord calls reverse_order, however for some cases it raises
# ActiveRecord::IrreversibleOrderError error.
class LastItems
# rubocop: disable CodeReuse/ActiveRecord
def self.take_items(scope, count)
if custom_order = lookup_custom_reverse_order(scope.order_values)
items = scope.reorder(*custom_order).first(count) # returns a single record when count is nil
items.is_a?(Array) ? items.reverse : items
else
scope.last(count)
end
end
# rubocop: enable CodeReuse/ActiveRecord
# Detect special ordering and provide the reversed order
def self.lookup_custom_reverse_order(order_values)
if ordering_by_merged_at_and_mr_id_desc?(order_values)
[
Gitlab::Database.nulls_first_order('merge_request_metrics.merged_at', 'ASC'), # reversing the order
MergeRequest.arel_table[:id].asc
]
elsif ordering_by_merged_at_and_mr_id_asc?(order_values)
[
Gitlab::Database.nulls_first_order('merge_request_metrics.merged_at', 'DESC'),
MergeRequest.arel_table[:id].asc
]
end
end
def self.ordering_by_merged_at_and_mr_id_desc?(order_values)
order_values.size == 2 &&
order_values.first.to_s == Gitlab::Database.nulls_last_order('merge_request_metrics.merged_at', 'DESC') &&
order_values.last.is_a?(Arel::Nodes::Descending) &&
order_values.last.to_sql == MergeRequest.arel_table[:id].desc.to_sql
end
def self.ordering_by_merged_at_and_mr_id_asc?(order_values)
order_values.size == 2 &&
order_values.first.to_s == Gitlab::Database.nulls_last_order('merge_request_metrics.merged_at', 'ASC') &&
order_values.last.is_a?(Arel::Nodes::Descending) &&
order_values.last.to_sql == MergeRequest.arel_table[:id].desc.to_sql
end
private_class_method :ordering_by_merged_at_and_mr_id_desc?
private_class_method :ordering_by_merged_at_and_mr_id_asc?
end
end
end
end
end
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