grape api return total

desc 'Get list of currencies',
          is_array: true,
          success: Entities::Currency
        params do
          optional :type, type: String,
                          values: %w[fiat coin],
                          desc: -> { API::V2::Entities::Currency.documentation[:type][:desc] }
        end
        get '/currencies' do
          currencies = Currency.enabled
          currencies = currencies.where(type: params[:type]).includes(:blockchain) if params[:type] == 'coin'
          currencies = currencies.where(type: params[:type]) if params[:type] == 'fiat'
            present :total, currencies.count
            present :data, currencies.ordered, with: API::V2::Entities::Currency
        end