code: def _add_api_to_swagger(self, event_id, event_properties, template):
          
  
          # Need to grab the AWS::Serverless::Api resource for this API event and update its Swagger definition
          api_id = self._get_api_id(event_properties)
  
          # RestApiId is not pointing to a valid  API resource
          if isinstance(api_id, dict) or not template.get(api_id):
              raise InvalidEventException(event_id,
                                          "RestApiId must be a valid reference to an 'AWS::Serverless::Api' resource "
                                          "in same template")
  
          # Make sure Swagger is valid
          resource = template.get(api_id)
          if not (resource and
                  isinstance(resource.properties, dict) and
                  SwaggerEditor.is_valid(resource.properties.get("DefinitionBody"))):
              # This does not have an inline Swagger. Nothing can be done about it.
              return
  
          if not resource.properties.get("__MANAGE_SWAGGER"):
              # Do not add the api to Swagger, if the resource is not actively managed by SAM.
              # ie. Implicit API resources are created & managed by SAM on behalf of customers.
              # But for explicit API resources, customers write their own Swagger and manage it.
              # If a path is present in Events section but *not* present in the Explicit API Swagger, then it is
              # customer's responsibility to add to Swagger. We will not modify the Swagger here.
              #
              # In the future, we will might expose a flag that will allow SAM to manage explicit API Swagger as well.
              # Until then, we will not modify explicit explicit APIs.
              return
  
          swagger = resource.properties.get("DefinitionBody")
  
          path = event_properties["Path"]
          method = event_properties["Method"]
          editor = SwaggerEditor(swagger)
          editor.add_path(path, method)
  
          resource.properties["DefinitionBody"] = editor.swagger
          template.set(api_id, resource)
docs: Adds the API path/method from the given event to the Swagger JSON of Serverless::Api resource this event
          refers to.
  
          :param string event_id: LogicalId of the event
          :param dict event_properties: Properties of the event
          :param SamTemplate template: SAM Template to search for Serverless::Api resources