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nullstring.go
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/
nullstring.go
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package utils
import (
"database/sql"
"encoding/json"
"github.com/99designs/gqlgen/graphql"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
// NullString wrapper around sql.NullString
type NullString struct {
sql.NullString
}
// IsZero method is called by bson.IsZero in Mongo for type = NullTime
func (x NullString) IsZero() bool {
return !x.Valid
}
// MarshalNullString is used by graphql to marshal into a string
func MarshalNullString(x NullString) graphql.Marshaler {
if !x.Valid {
return graphql.Null
}
return graphql.MarshalString(x.String)
}
// UnmarshalNullString is used by graphql to unmarshal from a NullString into a string
func UnmarshalNullString(s interface{}) (NullString, error) {
if s == nil {
return NullString{sql.NullString{Valid: false}}, nil
}
uString, err := graphql.UnmarshalString(s)
if err != nil {
return NullString{}, err
}
return NullString{
sql.NullString{
String: uString,
Valid: true,
},
}, err
}
// MarshalBSONValue method is called by bson.Marshal in Mongo for type = NullString
func (x *NullString) MarshalBSONValue() (bsontype.Type, []byte, error) {
if !x.Valid {
return bsontype.Null, nil, nil
}
valueType, b, err := bson.MarshalValue(x.String)
return valueType, b, err
}
// UnmarshalBSONValue method is called by bson.Unmarshal in Mongo for type = NullString
func (x *NullString) UnmarshalBSONValue(t bsontype.Type, data []byte) error {
raw := bson.RawValue{Type: t, Value: data}
var uString string
if err := raw.Unmarshal(&uString); err != nil {
return err
}
if raw.Value == nil {
x.Valid = false
return nil
}
x.Valid = true
x.String = uString
return nil
}
// MarshalJSON method is called by the JSON marshaller
func (x *NullString) MarshalJSON() ([]byte, error) {
if !x.Valid {
return []byte("null"), nil
}
b, err := json.Marshal(x.String)
return b, err
}
// UnmarshalJSON method is called by the JSON unmarshaller
func (x *NullString) UnmarshalJSON(data []byte) error {
x.Valid = false
if data == nil {
return nil
}
var nullString string
if err := json.Unmarshal(data, &nullString); err != nil {
return err
}
x.Valid = true
x.String = nullString
return nil
}