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# frozen_string_literal: true
module BatchLoaders
class MergeRequestDiffSummaryBatchLoader
NIL_STATS = { additions: 0, deletions: 0, file_count: 0 }.freeze
def self.load_for(merge_request)
BatchLoader::GraphQL.for(merge_request).batch(key: :diff_stats_summary) do |merge_requests, loader, args|
Preloaders::MergeRequestDiffPreloader.new(merge_requests).preload_all
merge_requests.each do |merge_request|
metrics = merge_request.metrics
summary = if metrics && metrics.added_lines && metrics.removed_lines
{
additions: metrics.added_lines,
deletions: metrics.removed_lines,
file_count: merge_request.merge_request_diff&.files_count || 0
}
elsif merge_request.diff_stats.blank?
NIL_STATS
else
merge_request.diff_stats.each_with_object(NIL_STATS.dup) do |status, summary|
summary.merge!(
additions: status.additions,
deletions: status.deletions,
file_count: 1
) do |_, x, y|
x + y
end
end
end
loader.call(merge_request, summary)
end
end
end
end
end
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