65 lines
2.1 KiB
Ruby
65 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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module MergeRequests
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# OldestPerCommitFinder is used to retrieve the oldest merge requests for
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# every given commit, grouped per commit SHA.
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#
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# This finder is useful when you need to efficiently retrieve the first/oldest
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# merge requests for multiple commits, and you want to do so in batches;
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# instead of running a query for every commit.
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class OldestPerCommitFinder
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def initialize(project)
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@project = project
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end
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# Returns a Hash that maps a commit ID to the oldest merge request that
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# introduced that commit.
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def execute(commits)
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mapping = {}
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shas = commits.map(&:id)
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# To include merge requests by the merge/squash SHA, we don't need to go
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# through any diff rows.
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#
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# We can't squeeze all this into a single query, as the diff based data
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# relies on a GROUP BY. On the other hand, retrieving MRs by their merge
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# SHAs separately is much easier, and plenty fast.
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@project
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.merge_requests
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.preload_target_project
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.by_merge_or_squash_commit_sha(shas)
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.each do |mr|
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# Merge/squash SHAs can't be in the merge request itself. It _is_
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# possible a newer merge request includes the commit, but in that case
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# we still want the oldest merge request.
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#
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# It's also possible that a merge request produces both a squashed
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# commit and a merge commit. In that case we want to store the mapping
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# for both the SHAs.
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mapping[mr.squash_commit_sha] = mr if mr.squash_commit_sha
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mapping[mr.merge_commit_sha] = mr if mr.merge_commit_sha
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end
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remaining = shas - mapping.keys
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return mapping if remaining.empty?
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id_rows = MergeRequestDiffCommit
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.oldest_merge_request_id_per_commit(@project.id, remaining)
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mrs = MergeRequest
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.preload_target_project
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.id_in(id_rows.map { |r| r[:merge_request_id] })
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.index_by(&:id)
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id_rows.each do |row|
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if (mr = mrs[row[:merge_request_id]])
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mapping[row[:sha]] = mr
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end
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end
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mapping
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end
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end
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end
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