40 lines
809 B
Go
40 lines
809 B
Go
package types
|
|
|
|
import (
|
|
"bytes"
|
|
"database/sql"
|
|
"encoding/json"
|
|
)
|
|
|
|
// NullString wraps sql.NullString so that the JSON serialization can be overridden.
|
|
type NullString struct {
|
|
sql.NullString
|
|
}
|
|
|
|
// MarshalJSON makes NullString a json.Marshaller.
|
|
func (s *NullString) MarshalJSON() ([]byte, error) {
|
|
if !s.Valid {
|
|
return []byte("null"), nil
|
|
}
|
|
return json.Marshal(s.String)
|
|
}
|
|
|
|
// UnmarshalJSON makes NullString a json.Unmarshaller.
|
|
func (s *NullString) UnmarshalJSON(b []byte) error {
|
|
if bytes.Equal(b, []byte("null")) {
|
|
s.String = ""
|
|
s.Valid = false
|
|
return nil
|
|
}
|
|
var x interface{}
|
|
var err error
|
|
json.Unmarshal(b, &x)
|
|
switch x.(type) {
|
|
case string:
|
|
err = json.Unmarshal(b, &s.String)
|
|
case map[string]interface{}:
|
|
err = json.Unmarshal(b, &s.NullString)
|
|
}
|
|
s.Valid = true
|
|
return err
|
|
}
|