What does pagination_data do?

[markgaensicke]

I have trouble understanding what the output of this method should be (and, well, the transformations that take place in that method). Can somebody explain please?

      def pagination_data(resource, key)
        keys = [:pagination, key]

        [resource.data, resource.metadata[:options]].inject(nil) do |result, data_source|
          result or keys.inject(data_source) { |source, key| source.try(:[], key) }
        end
      end

pageable.rb#L64