Add scalar json

Author: RichardLindhout

boilergql/scaler_json.go

@@ -0,0 +1,26 @@
+package boilergql
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+)
+
+type JSON map[string]interface{}
+
+func (b *JSON) UnmarshalGQL(v interface{}) error {
+	bytes, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(bytes, b)
+}
+
+func (b JSON) MarshalGQL(w io.Writer) {
+	bytes, err := json.Marshal(b)
+	if err != nil {
+		fmt.Fprintf(w, `"%s"`, err.Error())
+		return
+	}
+	_, _ = w.Write(bytes)
+}