68 lines
2.2 KiB
Ruby
68 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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class MultiCollectionPaginator
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attr_reader :first_collection, :second_collection, :per_page
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def initialize(*collections, per_page: nil)
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raise ArgumentError.new('Only 2 collections are supported') if collections.size != 2
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@per_page = (per_page || Kaminari.config.default_per_page).to_i
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@first_collection, @second_collection = collections
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end
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def paginate(page)
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page = page.to_i
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paginated_first_collection(page) + paginated_second_collection(page)
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end
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def total_count
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@total_count ||= first_collection.size + second_collection.size
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end
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private
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def paginated_first_collection(page)
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@first_collection_pages ||= Hash.new do |hash, page|
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hash[page] = first_collection.page(page).per(per_page)
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end
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@first_collection_pages[page]
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end
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def paginated_second_collection(page)
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@second_collection_pages ||= Hash.new do |hash, page|
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second_collection_page = page - first_collection_page_count
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offset = if second_collection_page < 1 || first_collection_page_count.zero?
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0
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else
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per_page - first_collection_last_page_size
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end
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hash[page] = second_collection.page(second_collection_page)
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.per(per_page - paginated_first_collection(page).size)
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.padding(offset)
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end
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@second_collection_pages[page]
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end
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def first_collection_page_count
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return @first_collection_page_count if defined?(@first_collection_page_count)
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first_collection_page = paginated_first_collection(0)
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@first_collection_page_count = first_collection_page.total_pages
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end
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# rubocop: disable CodeReuse/ActiveRecord
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def first_collection_last_page_size
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return @first_collection_last_page_size if defined?(@first_collection_last_page_size)
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@first_collection_last_page_size = paginated_first_collection(first_collection_page_count)
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.except(:select)
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.size
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end
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# rubocop: enable CodeReuse/ActiveRecord
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end
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end
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