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# frozen_string_literal: true
module MergeRequests
class ReloadMergeHeadDiffService
include BaseServiceUtility
def initialize(merge_request)
@merge_request = merge_request
end
def execute
return error("Merge request has no merge ref head.") unless merge_request.merge_ref_head.present?
error_msg = recreate_merge_head_diff
return error(error_msg) if error_msg
success
end
private
attr_reader :merge_request
def recreate_merge_head_diff
merge_request.merge_head_diff&.destroy!
# n+1: https://gitlab.com/gitlab-org/gitlab/-/issues/19377
Gitlab::GitalyClient.allow_n_plus_1_calls do
merge_request.create_merge_head_diff!
end
# Reset the merge request so it won't load the merge head diff as the
# MergeRequest#merge_request_diff.
merge_request.reset
nil
rescue StandardError => e
message = "Failed to recreate merge head diff: #{e.message}"
Gitlab::AppLogger.error(message: message, merge_request_id: merge_request.id)
message
end
end
end
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