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# frozen_string_literal: true
module MergeRequests
# OldestPerCommitFinder is used to retrieve the oldest merge requests for
# every given commit, grouped per commit SHA.
#
# This finder is useful when you need to efficiently retrieve the first/oldest
# merge requests for multiple commits, and you want to do so in batches;
# instead of running a query for every commit.
class OldestPerCommitFinder
def initialize(project)
@project = project
end
# Returns a Hash that maps a commit ID to the oldest merge request that
# introduced that commit.
def execute(commits)
id_rows = MergeRequestDiffCommit
.oldest_merge_request_id_per_commit(@project.id, commits.map(&:id))
mrs = MergeRequest
.preload_target_project
.id_in(id_rows.map { |r| r[:merge_request_id] })
.index_by(&:id)
id_rows.each_with_object({}) do |row, hash|
if (mr = mrs[row[:merge_request_id]])
hash[row[:sha]] = mr
end
end
end
end
end
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