77 lines
2.8 KiB
Ruby
77 lines
2.8 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
module Pagination
|
|
class OffsetPagination < Base
|
|
attr_reader :request_context
|
|
delegate :params, :header, :request, to: :request_context
|
|
|
|
def initialize(request_context)
|
|
@request_context = request_context
|
|
end
|
|
|
|
def paginate(relation)
|
|
paginate_with_limit_optimization(add_default_order(relation)).tap do |data|
|
|
add_pagination_headers(data)
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def paginate_with_limit_optimization(relation)
|
|
pagination_data = relation.page(params[:page]).per(params[:per_page])
|
|
return pagination_data unless pagination_data.is_a?(ActiveRecord::Relation)
|
|
return pagination_data unless Feature.enabled?(:api_kaminari_count_with_limit)
|
|
|
|
limited_total_count = pagination_data.total_count_with_limit
|
|
if limited_total_count > Kaminari::ActiveRecordRelationMethods::MAX_COUNT_LIMIT
|
|
# The call to `total_count_with_limit` memoizes `@arel` because of a call to `references_eager_loaded_tables?`
|
|
# We need to call `reset` because `without_count` relies on `@arel` being unmemoized
|
|
pagination_data.reset.without_count
|
|
else
|
|
pagination_data
|
|
end
|
|
end
|
|
|
|
def add_default_order(relation)
|
|
if relation.is_a?(ActiveRecord::Relation) && relation.order_values.empty?
|
|
relation = relation.order(:id) # rubocop: disable CodeReuse/ActiveRecord
|
|
end
|
|
|
|
relation
|
|
end
|
|
|
|
def add_pagination_headers(paginated_data)
|
|
header 'X-Per-Page', paginated_data.limit_value.to_s
|
|
header 'X-Page', paginated_data.current_page.to_s
|
|
header 'X-Next-Page', paginated_data.next_page.to_s
|
|
header 'X-Prev-Page', paginated_data.prev_page.to_s
|
|
header 'Link', pagination_links(paginated_data)
|
|
|
|
return if data_without_counts?(paginated_data)
|
|
|
|
header 'X-Total', paginated_data.total_count.to_s
|
|
header 'X-Total-Pages', total_pages(paginated_data).to_s
|
|
end
|
|
|
|
def pagination_links(paginated_data)
|
|
[].tap do |links|
|
|
links << %(<#{page_href(page: paginated_data.prev_page)}>; rel="prev") if paginated_data.prev_page
|
|
links << %(<#{page_href(page: paginated_data.next_page)}>; rel="next") if paginated_data.next_page
|
|
links << %(<#{page_href(page: 1)}>; rel="first")
|
|
|
|
links << %(<#{page_href(page: total_pages(paginated_data))}>; rel="last") unless data_without_counts?(paginated_data)
|
|
end.join(', ')
|
|
end
|
|
|
|
def total_pages(paginated_data)
|
|
# Ensure there is in total at least 1 page
|
|
[paginated_data.total_pages, 1].max
|
|
end
|
|
|
|
def data_without_counts?(paginated_data)
|
|
paginated_data.is_a?(Kaminari::PaginatableWithoutCount)
|
|
end
|
|
end
|
|
end
|
|
end
|