70 lines
2.3 KiB
Ruby
70 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Diff
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module FileCollection
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# Builds a paginated diff file collection and collects pagination
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# metadata.
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#
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# It doesn't handle caching yet as we're not prepared to write/read
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# separate file keys (https://gitlab.com/gitlab-org/gitlab/issues/30550).
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#
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class MergeRequestDiffBatch < MergeRequestDiffBase
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DEFAULT_BATCH_PAGE = 1
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DEFAULT_BATCH_SIZE = 20
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attr_reader :pagination_data
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def initialize(merge_request_diff, batch_page, batch_size, diff_options:)
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super(merge_request_diff, diff_options: diff_options)
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batch_page ||= DEFAULT_BATCH_PAGE
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batch_size ||= DEFAULT_BATCH_SIZE
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@paginated_collection = relation.page(batch_page).per(batch_size)
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@pagination_data = {
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current_page: @paginated_collection.current_page,
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next_page: @paginated_collection.next_page,
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total_pages: @paginated_collection.total_pages
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}
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end
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override :diffs
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def diffs
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strong_memoize(:diffs) do
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@merge_request_diff.opening_external_diff do
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# Avoiding any extra queries.
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collection = @paginated_collection.to_a
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# The offset collection and calculation is required so that we
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# know how much has been loaded in previous batches, collapsing
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# the current paginated set accordingly (collection limit calculation).
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# See: https://docs.gitlab.com/ee/development/diffs.html#diff-collection-limits
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#
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offset_index = collection.first&.index
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options = diff_options.dup
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collection =
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if offset_index && offset_index > 0
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offset_collection = relation.limit(offset_index) # rubocop:disable CodeReuse/ActiveRecord
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options[:offset_index] = offset_index
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offset_collection + collection
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else
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collection
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end
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Gitlab::Git::DiffCollection.new(collection.map(&:to_hash), options)
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end
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end
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end
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private
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def relation
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@merge_request_diff.merge_request_diff_files
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end
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end
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end
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end
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end
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