Add support for to flatten array

serializer.js

@@ -22,6 +22,7 @@ class SerializerField {
 		this.field = f;
 		this.required = f.required;
 		this.type = this.field.getAttribute("type");
+		this.flatten = this.field.hasAttribute("flatten");
 	}
 
 	/**
@@ -168,13 +169,26 @@ class Serializer {
 				for (let key in f) {
 					if (f[key]) {
 						let d = f[key].serialize();
-						if (d !== null) {
-							if (k == "") {
-								json[key] = d;
-								continue;
-							}
-							json[k][key] = d;
+						if (d == null) {
+							continue
 						}
+
+						if(k == "") {
+							if(f[key].flatten){
+								json[key].push(d);
+							} else {
+								json[key] = d;
+							}
+
+							continue
+						}
+
+						if(f[key].flatten){
+							json[k].push(d);
+							continue;
+						}
+
+						json[k][key] = d;
 					}
 				}
 			} else {
@@ -246,7 +260,7 @@ class Validator {
 
 					let v = Validator.validateRequired(sf);
 					if (!v.valid) {
-						console.log(e.errors);
+						console.error(e.errors);
 						e.errors[sf.name].push(v.errors);
 						continue;
 					}