I have a struct with updated_at field which I want to be JSON encoded as a unix timestamp.
I tried the following which doesn’t seem to work, the updated_at field is never unmarshalled from the MongoDB document:
type Timestamp time.now
func (t Timestamp) MarshalJSON() ([]byte, error) {
ts := time.Time(t).Unix()
fmt.Println(ts)
stamp := fmt.Sprint(ts)
return []byte(stamp), nil
}
type User struct {
UpdatedAt *Timestamp `bson:"updated_at,omitempty" json:"updated_at,omitempty"`
}
I found a temp solution, to write the struct’s MarshalJSON function, doing something like this (changing the UpdatedAt type to *time.Time):
func (u *User) MarshalJSON() ([]byte, error) {
out := make(map[string]interface{})
if u.UpdatedAt != nil && !u.UpdatedAt.IsZero() {
out["updated_at"] = u.UpdatedAt.Unix()
}
return json.Marshal(out)
}
is there a better or more elegant solution for doing this?