fix: properly discover json.Marshaler on ptr field

internal/dbtest/db_test.go

@@ -240,6 +240,7 @@ func TestDB(t *testing.T) {
 		{testTxScanAndCount},
 		{testEmbedModelValue},
 		{testEmbedModelPointer},
+		{testJSONMarshaler},
 	}
 
 	testEachDB(t, func(t *testing.T, dbName string, db *bun.DB) {
@@ -1155,3 +1156,31 @@ func testEmbedTypeField(t *testing.T, db *bun.DB) {
 	require.NoError(t, err)
 	require.Equal(t, *m1, m2)
 }
+
+type JSONField struct {
+	Foo string `json:"foo"`
+}
+
+func (f *JSONField) MarshalJSON() ([]byte, error) {
+	return []byte(`{"foo": "bar"}`), nil
+}
+
+func testJSONMarshaler(t *testing.T, db *bun.DB) {
+	type Model struct {
+		Field *JSONField
+	}
+
+	ctx := context.Background()
+
+	err := db.ResetModel(ctx, (*Model)(nil))
+	require.NoError(t, err)
+
+	m1 := &Model{Field: new(JSONField)}
+	_, err = db.NewInsert().Model(m1).Exec(ctx)
+	require.NoError(t, err)
+
+	var m2 Model
+	err = db.NewSelect().Model(&m2).Scan(ctx)
+	require.NoError(t, err)
+	require.Equal(t, "bar", m2.Field.Foo)
+}

internal/dbtest/query_test.go

@@ -656,6 +656,12 @@ func TestQuery(t *testing.T) {
 			}
 			return db.NewInsert().Model(&Model{ID: ID("embed")})
 		},
+		func(db *bun.DB) schema.QueryAppender {
+			type Model struct {
+				Raw *json.RawMessage `bun:",nullzero"`
+			}
+			return db.NewInsert().Model(new(Model))
+		},
 	}
 
 	timeRE := regexp.MustCompile(`'\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+(\+\d{2}:\d{2})?'`)

internal/dbtest/testdata/snapshots/TestQuery-mariadb-106

@@ -0,0 +1 @@
+INSERT INTO `models` (`raw`) VALUES (DEFAULT) RETURNING `raw`

internal/dbtest/testdata/snapshots/TestQuery-mysql5-106

@@ -0,0 +1 @@
+INSERT INTO `models` (`raw`) VALUES (DEFAULT)

internal/dbtest/testdata/snapshots/TestQuery-mysql8-106

@@ -0,0 +1 @@
+INSERT INTO `models` (`raw`) VALUES (DEFAULT)

internal/dbtest/testdata/snapshots/TestQuery-pg-106

@@ -0,0 +1 @@
+INSERT INTO "models" ("raw") VALUES (DEFAULT) RETURNING "raw"

internal/dbtest/testdata/snapshots/TestQuery-pgx-106

@@ -0,0 +1 @@
+INSERT INTO "models" ("raw") VALUES (DEFAULT) RETURNING "raw"

internal/dbtest/testdata/snapshots/TestQuery-sqlite-106

@@ -0,0 +1 @@
+INSERT INTO "models" ("raw") VALUES (NULL) RETURNING "raw"

schema/append_value.go

@@ -128,6 +128,9 @@ func appender(dialect Dialect, typ reflect.Type) AppenderFunc {
 	case reflect.Interface:
 		return ifaceAppenderFunc
 	case reflect.Ptr:
+		if typ.Implements(jsonMarshalerType) {
+			return AppendJSONValue
+		}
 		if fn := Appender(dialect, typ.Elem()); fn != nil {
 			return PtrAppender(fn)
 		}

schema/reflect.go

@@ -17,6 +17,7 @@ var (
 
 	driverValuerType  = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
 	queryAppenderType = reflect.TypeOf((*QueryAppender)(nil)).Elem()
+	jsonMarshalerType = reflect.TypeOf((*json.Marshaler)(nil)).Elem()
 )
 
 func indirectType(t reflect.Type) reflect.Type {

schema/scan.go

@@ -94,6 +94,8 @@ func scanner(typ reflect.Type) ScannerFunc {
 	}
 
 	switch typ {
+	case bytesType:
+		return scanBytes
 	case timeType:
 		return scanTime
 	case ipType: