Incorrect decoding in Mongo-go-driver - mongodb

Question

For example, I have this structure:
type Overview struct {
Symbol string `json:"Symbol,omitempty"`
AssetType string `json:"AssetType,omitempty"`
Name string `json:"Name,omitempty"`
Description string `json:"Description,omitempty"`
...
...
}
In addition to this, I have several other structures.
My function selects a suitable structure for Decode(), but when I try to get data from the database, I get the result in this form:
[
{
"Key": "_id",
"Value": "618aa6f2a64cb8105a9c7984"
},
{
"Key": "Symbol",
"Value": "IBM"
},
{
"Key": "FiscalYearEnd",
"Value": "December"
},
...
...
]
I expect a response in the form of my structure, but I get such an array. I tried declaring the structure for the response myself: var result models.Overview. After that, the problem disappeared, but this is not the solution for my problem
There is my function:
var (
models map[string]interface{}
)
func init() {
models = make(map[string]interface{})
models["Overview"] = models.Overview{}
models["Earnings"] = models.Earnings{}
...
...
}
func GetDbData(collection string, db *mongo.Database, filter bson.D) (interface{}, error) {
var result = models[collection] // Choosing a structure
res := db.Collection(collection).FindOne(context.TODO(), filter)
err := res.Decode(&result)
if err != nil {
return nil, err
}
return result, nil
}
I can't understand why this is happening, I hope that someone has already encountered this problem and will be able to help me

Answer 1

https://jira.mongodb.org/browse/GODRIVER-988
Another approach to solve this can be by first decoding it into bson.M type and then unmarshalling it to your struct. Yes, this is not optimal.
eg:
func GetMonthStatusByID(ctx context.Context, id string) (interface{}, error) {
var monthStatus interface{}
filter := bson.M\{"_id": id}
err := db.Collection("Months").FindOne(ctx, filter).Decode(&monthStatus)
return monthStatus, err
}
The above snippet should be changed to:
func GetMonthStatusByID(ctx context.Context, id string) (interface{}, error) {
var monthStatus interface{}
filter := bson.M\{"_id": id}
tempResult := bson.M{}
err := db.Collection("Months").FindOne(ctx, filter).Decode(&tempResult)
if err == nil {
obj, _ := json.Marshal(tempResult)
err= json.Unmarshal(obj, &monthStatus)
}
return monthStatus, err
}