text: """Simple helper to paginate query
  """
  from flask import url_for, request
  
  DEFAULT_PAGE_SIZE = 50
  DEFAULT_PAGE_NUMBER = 1
  
  
  def paginate(query, schema):
      page = request.args.get('page', DEFAULT_PAGE_NUMBER)
      per_page = request.args.get('page_size', DEFAULT_PAGE_SIZE)
      page_obj = query.paginate(page=page, per_page=per_page)
      next = url_for(
          request.endpoint,
          page=page_obj.next_num if page_obj.has_next else page_obj.page,
          per_page=per_page,
          **request.view_args
      )
      prev = url_for(
          request.endpoint,
          page=page_obj.prev_num if page_obj.has_prev else page_obj.page,
          per_page=per_page,
          **request.view_args
      )
  
      return {
          'total': page_obj.total,
          'pages': page_obj.pages,
          'next': next,
          'prev': prev,
          'results': schema.dump(page_obj.items).data
      }
  