Comment implémenter un marshalling et un démarshalling personnalisés pour accéder aux données MongoDB au fur et à mesure du temps de déplacement ?

type clientConfigData struct {
    SMTPAssoc      int       `bson:"smtp_assoc"`
    PlanType       string    `bson:"plan_type"`
    EndDate        string    `bson:"end_date"`
}

import (
    "context"
    "time"

    "github.com/mongodb/mongo-go-driver/bson"
)

type clientConfigData struct {
    SMTPAssoc  int       `bson:"smtp_assoc"`
    PlanType   string    `bson:"plan_type"`
    EndDateStr string    `bson:"end_date"`
    EndDate    time.Time `bson:"-"` // Excluded from MongoDB
}

const endDateLayout = "2006-01-02 15:04:05"

// bson.Setter implementation
func (c *clientConfigData) SetBSON(raw bson.Raw) (err error) {
    type my clientConfigData
    if err = raw.Unmarshal((*my)(c)); err != nil {
        return
    }
    c.EndDate, err = time.Parse(endDateLayout, c.EndDateStr)
    return
}

// bson.Getter implementation
func (c *clientConfigData) GetBSON() (interface{}, error) {
    c.EndDateStr = c.EndDate.Format(endDateLayout)
    type my *clientConfigData
    return my(c), nil
}

// Custom code to query MongoDB
func FindConfig(ctx context.Context, client *mongo.Client) (*clientConfigData, error) {
    var configRes *clientConfigData
    err := client.Database("test").Collection("clientconfig").FindOne(ctx, bson.M{}).Decode(&configRes)
    if err != nil {
        return nil, errors.Wrap(err, "finding config collection")
    }
    return configRes, nil
}