如何在GO中的多返回函数中仅返回一个变量？

Question

Hi I have this function which I want to return a docker.APIContainer and an error (nil if no errors), but in case of error what should I return in docker.APIContainer ?

this is the code

func GetContainersRunningImage(imagename string, tag string) ([]docker.Container,string) {
   logFields := log.Fields{

       "handler": "get service",
   }
   client, err := docker.NewTLSClient(sconf.DockConf.Endpoint, sconf.DockConf.Cert, sconf.DockConf.Key, sconf.DockConf.Ca)
   if err != nil {
      log.WithFields(logFields).Errorf("TLSClient could not be created: %s", err)
      return _,err.Error()
   }
}

what should I add instead of _? Am I obliged to create a var contarray []docker.Container and return it? or is there another way

Answer 1

return nil, err.Error()

goreturns will do this for you automatically - 0 for int and "" for string etc.