英文:
array of strings sorting as array of Interfaces with mgo in golang
问题
这是我的代码：
type CatMixing struct {Id bson.ObjectId `json:"id" bson:"_id,omitempty"`CatMix []string `json:"comb"`}func main(){session, err := mgo.Dial("127.0.0.1")if err != nil {panic(err)}defer session.Close()session.SetMode(mgo.Monotonic, true)c := session.DB("MixiIng").C("Combination")var results []bson.Merr5 := c.Find(nil).Limit(10).All(&results)if err5 == nil {}fmt.Println(results)for _,catm := range results {fmt.Println(catm)for _,catm2 := range catm {fmt.Println(reflect.TypeOf(catm2))}}}
问题是似乎comb是一个接口数组：
map[_id:ObjectIdHex("590e5cb36aace327da180c89") comb:[60fps]]bson.ObjectId[]interface {}
但在MongoDB中，它显示为一个字符串数组：
所以我的映射不起作用...
如果我尝试使用：
var results []CatMixing
我可以得到_id，但comb为空。
我不明白为什么它不是一个字符串数组，以及为什么我的映射不起作用。
我使用Python向MongoDB添加了数据：
from pymongo import MongoClientclient = MongoClient()db = client['MixiIng']collection = db['Combination']combination = {}result = [["60fps"]]for r in result :combination = {"comb":r}collection.insert_one(combination)
所以我不明白为什么comb不是一个字符串数组，以及如何获取它...
谢谢和问候。
英文:
here is my code :
type CatMixing struct {Id bson.ObjectId `json:"id" bson:"_id,omitempty"`CatMix []string `json:"comb"`}func main(){session, err := mgo.Dial("127.0.0.1")if err != nil {panic(err)}defer session.Close()session.SetMode(mgo.Monotonic, true)c := session.DB("MixiIng").C("Combination")var results []bson.Merr5 := c.Find(nil).Limit(10).All(&results)if err5 == nil {}fmt.Println(results)for _,catm := range results {fmt.Println(catm)for _,catm2 := range catm {fmt.Println(reflect.TypeOf(catm2))}}}
the problem is that it seems that comb is an array of interfaces :
map[_id:ObjectIdHex("590e5cb36aace327da180c89") comb:[60fps]]bson.ObjectId[]interface {}
but in mongo it shows as an array of string :
So my mapping is not working ...
If i try with :
var results []CatMixing
i have the _id but not comb , comb appears as empty
I don't understand why it's not an array of string and why my mapping is not working.
I've added data to mongodb with python :
from pymongo import MongoClientclient = MongoClient()db = client['MixiIng']collection = db['Combination']combination = {}result = [["60fps"]]for r in result :combination = {"comb":r}collection.insert_one(combination)
So i don't understand why comb is not an array of string and how to get it...
thanks and regards
答案1
得分: 1
首先，您可以使用[]CatMixing来更改查询中的results变量。因为.All(result interface{})需要一个interface{}参数，并不意味着您不能传递您的结构体。
请注意，Go中的interface{}可以保存任何类型，包括您的结构体。
尝试以下代码：
var results []CatMixingerr := c.Find(bson.M{}).Limit(10).All(&results)if err != nil {fmt.Fatal(err)}fmt.Println(results)
英文:
First you can change the results variable from the query using your []CatMixing. Because .All(result interface{}) needs an interace{} argument doesn't mean you can't pass your struct.
Note that interface{} in Go can hold any type including your struct.
try this code :
var results [] CatMixingerr := c.Find(bson.M{}).Limit(10).All(&results)if err != nil {fmt.Fatal(err)}fmt.Println(results)
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