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# frozen_string_literal: true
module Preloaders
# This class preloads the `merge_request_diff` association for the given merge request models.
#
# Usage:
# merge_requests = MergeRequest.where(...)
# Preloaders::MergeRequestDiffPreloader.new(merge_requests).preload_all
# merge_requests.first.merge_request_diff # won't fire any query
class MergeRequestDiffPreloader
def initialize(merge_requests)
@merge_requests = merge_requests
end
def preload_all
merge_request_diffs = MergeRequestDiff.latest_diff_for_merge_requests(@merge_requests)
cache = merge_request_diffs.index_by { |diff| diff.merge_request_id }
@merge_requests.each do |merge_request|
merge_request_diff = cache[merge_request.id]
merge_request.association(:merge_request_diff).target = merge_request_diff
merge_request.association(:merge_request_diff).loaded!
end
end
end
end
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