feat: add string scan support for JSONRawMessage

Now JSONRawMessage accepts both byte slice and string as source, improving the flexibility. Updated corresponding unit tests to reflect this change.

json_raw_message.go

@@ -4,7 +4,6 @@ import (
 	"database/sql/driver"
 	"encoding/json"
 	"fmt"
-	"reflect"
 )
 
 // JSONRawMessage holds a json.RawMessage. Keep in mind, that the JSON NULL
@@ -53,9 +52,14 @@ func (rm *JSONRawMessage) Scan(src any) error {
 	}
 	rm.Valid = true
 	// Copy bytes.
-	srcBytes, ok := src.([]byte)
-	if !ok {
-		return fmt.Errorf("cannot convert to byte slice: %s", reflect.TypeOf(src).String())
+	var srcBytes []byte
+	switch src := src.(type) {
+	case []byte:
+		srcBytes = src
+	case string:
+		srcBytes = []byte(src)
+	default:
+		return fmt.Errorf("unsupported source value type: %T", src)
 	}
 	b := make([]byte, len(srcBytes))
 	copy(b, srcBytes)

json_raw_message_test.go

@@ -110,11 +110,11 @@ func (suite *JSONRawMessageScanSuite) TestJSONNull() {
 
 func (suite *JSONRawMessageScanSuite) TestUnexpectedValue() {
 	var rm JSONRawMessage
-	err := rm.Scan("I'm not a byte slice.")
+	err := rm.Scan(1234)
 	suite.Error(err, "should fail")
 }
 
-func (suite *JSONRawMessageScanSuite) TestOK() {
+func (suite *JSONRawMessageScanSuite) TestOKByteSlice() {
 	v := json.RawMessage(`{"meow":"woof"}`)
 	var rm JSONRawMessage
 	err := rm.Scan([]byte(v))
@@ -123,6 +123,15 @@ func (suite *JSONRawMessageScanSuite) TestOK() {
 	suite.Equal(v, rm.RawMessage, "should scan correct value")
 }
 
+func (suite *JSONRawMessageScanSuite) TestOKString() {
+	v := json.RawMessage(`{"meow":"woof"}`)
+	var rm JSONRawMessage
+	err := rm.Scan(string(v))
+	suite.Require().NoError(err, "should not fail")
+	suite.True(rm.Valid, "should be valid")
+	suite.Equal(v, rm.RawMessage, "should scan correct value")
+}
+
 func TestJSONRawMessage_Scan(t *testing.T) {
 	suite.Run(t, new(JSONRawMessageScanSuite))
 }