code: def put(self, dash_id=0):
          
          data = request.get_json()
          updated = self._update_dash(dash_id, data)
          return build_response(dict(data=updated, code=200))
docs: Update a dash meta and content, return updated dash content.
  
          Args:
              dash_id: dashboard id.
  
          Returns:
              A dict containing the updated content of that dashboard, not include the meta info.