45 lines
1.6 KiB
Ruby
45 lines
1.6 KiB
Ruby
module API
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module Helpers
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module Pagination
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def paginate(relation)
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relation.page(params[:page]).per(params[:per_page]).tap do |data|
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add_pagination_headers(data)
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end
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end
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private
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def add_pagination_headers(paginated_data)
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header 'X-Total', paginated_data.total_count.to_s
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header 'X-Total-Pages', paginated_data.total_pages.to_s
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header 'X-Per-Page', paginated_data.limit_value.to_s
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header 'X-Page', paginated_data.current_page.to_s
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header 'X-Next-Page', paginated_data.next_page.to_s
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header 'X-Prev-Page', paginated_data.prev_page.to_s
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header 'Link', pagination_links(paginated_data)
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end
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def pagination_links(paginated_data)
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request_url = request.url.split('?').first
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request_params = params.clone
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request_params[:per_page] = paginated_data.limit_value
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links = []
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request_params[:page] = paginated_data.current_page - 1
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links << %(<#{request_url}?#{request_params.to_query}>; rel="prev") unless paginated_data.first_page?
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request_params[:page] = paginated_data.current_page + 1
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links << %(<#{request_url}?#{request_params.to_query}>; rel="next") unless paginated_data.last_page?
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request_params[:page] = 1
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links << %(<#{request_url}?#{request_params.to_query}>; rel="first")
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request_params[:page] = paginated_data.total_pages
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links << %(<#{request_url}?#{request_params.to_query}>; rel="last")
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links.join(', ')
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end
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end
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end
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end
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