Golang MongoDB 错误 : result argument must be a slice address - (Arrays)

Question

我想从 mongo 集合中检索 ID 列表(长类型)

ids: = [] int64
if count >= 5 {
  err = collection.Find(query).Select(bson.M {
    "_id": 1
  }).Skip(rand.Intn(count - 4)).Limit(4).All(ids)
}

我收到一个错误提示 http: panic serving [::1]:62322: result argument must be a slice address

我尝试使用 make 来获取 slice ，这导致了同样的错误

ids: = make([]int64, 0, 4)
if count >= 5 {
  err = collection.Find(query).Select(bson.M {
    "_id": 1
  }).Skip(rand.Intn(count - 4)).Limit(4).All(ids)
}

Answer 1

将指向 slice 的指针传递给 All:

ids: = []int64
if count >= 5 {
  err = collection.Find(query).
      Select(bson.M{"_id": 1}).
      Skip(rand.Intn(count - 4)).
      Limit(4).
      All(&ids)  // <-- change is here
}