我有一个函数需要从mongoDB集合中检索所有用户,但是当我尝试通过REST端点调用它时,会抛出错误。该函数如下:
func (usercontroller UserController) GetAllUsers(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
session := usercontroller.session.Copy()
defer session.Close()
// Stub user
result := models.User{}
// get all users
if err := session.DB("Auth").C("users").Find(nil).All(&result); err != nil {
w.WriteHeader(404)
return
}
// Marshal provided interface into JSON structure
mResult, _ := json.Marshal(result)
// Write content-type, statuscode, and the data package
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
fmt.Fprintf(w, "%s", mResult)
}
错误是:
2016/06/25 16:00:21 http: panic serving 127.0.0.1:49898: result argument must be a slice address
goroutine 13 [running]:
net/http.(*conn).serve.func1(0xc82005e380)
/usr/lib/go-1.6/src/net/http/server.go:1389 +0xc1
panic(0x729b60, 0xc82000ba50)
/usr/lib/go-1.6/src/runtime/panic.go:443 +0x4e9
gopkg.in/mgo%2ev2.(*Iter).All(0xc8201280f0, 0x704600, 0xc82007e360, 0x0, 0x0)
/root/work/src/gopkg.in/mgo.v2/session.go:3696 +0x742
gopkg.in/mgo%2ev2.(*Query).All(0xc8200bc600, 0x704600, 0xc82007e360, 0x0, 0x0)
/root/work/src/gopkg.in/mgo.v2/session.go:3723 +0x4f
Auth-REST-Server/controllers.UserController.GetAllUsers(0xc82000d040, 0x7f3c1b9bf950, 0xc820061c70, 0xc8200c6380, 0x0, 0x0, 0x0)
/root/work/src/Auth-REST-Server/controllers/user.go:34 +0x251
Auth-REST-Server/controllers.(UserController).GetAllUsers-fm(0x7f3c1b9bf950, 0xc820061c70, 0xc8200c6380, 0x0, 0x0, 0x0)
/root/work/src/Auth-REST-Server/server.go:21 +0x5f
github.com/julienschmidt/httprouter.(*Router).ServeHTTP(0xc820016380, 0x7f3c1b9bf950, 0xc820061c70, 0xc8200c6380)
/root/work/src/github.com/julienschmidt/httprouter/router.go:344 +0x195
net/http.serverHandler.ServeHTTP(0xc820122000, 0x7f3c1b9bf950, 0xc820061c70, 0xc8200c6380)
/usr/lib/go-1.6/src/net/http/server.go:2081 +0x19e
net/http.(*conn).serve(0xc82005e380)
/usr/lib/go-1.6/src/net/http/server.go:1472 +0xf2e
created by net/http.(*Server).Serve
/usr/lib/go-1.6/src/net/http/server.go:2137 +0x44e
我在这里做错了什么?我以为只需调用Find(nil).All(&result)即可相应地检索所有记录。
FindAll
查询返回的是对象数组而不是单个对象。因此,你可以使用result := []models.User{}
代替result := models.User{}
来解决这个问题。 - muthukumar selvaraj