fix(amplify-codegen): fix for non-model decoding in flutter v1 (#843)

aws-amplify/amplify-flutter#4872

Author: Equartey

packages/appsync-modelgen-plugin/src/__tests__/visitors/__snapshots__/appsync-dart-visitor.test.ts.snap

@@ -1142,12 +1142,14 @@ class Contact {
   Contact.fromJson(Map<String, dynamic> json)  
     : _contactName = json['contactName'],
       _phone = json['phone'] != null
-        ? Phone.fromJson(new Map<String, dynamic>.from(json['phone']))
+          ? json['phone']['serializedData'] != null
+              ? Phone.fromJson(new Map<String, dynamic>.from(json['phone']['serializedData']))
+              : Phone.fromJson(new Map<String, dynamic>.from(json['phone']))
         : null,
       _mailingAddresses = json['mailingAddresses'] is List
         ? (json['mailingAddresses'] as List)
           .where((e) => e != null)
-          .map((e) => Address.fromJson(new Map<String, dynamic>.from(e)))
+          .map((e) => Address.fromJson(new Map<String, dynamic>.from(e['serializedData'] ?? e)))
           .toList()
         : null;
 
@@ -1390,12 +1392,14 @@ class Person extends amplify_core.Model {
     : id = json['id'],
       _name = json['name'],
       _phone = json['phone'] != null
-        ? Phone.fromJson(new Map<String, dynamic>.from(json['phone']))
+          ? json['phone']['serializedData'] != null
+              ? Phone.fromJson(new Map<String, dynamic>.from(json['phone']['serializedData']))
+              : Phone.fromJson(new Map<String, dynamic>.from(json['phone']))
         : null,
       _mailingAddresses = json['mailingAddresses'] is List
         ? (json['mailingAddresses'] as List)
           .where((e) => e != null)
-          .map((e) => Address.fromJson(new Map<String, dynamic>.from(e)))
+          .map((e) => Address.fromJson(new Map<String, dynamic>.from(e['serializedData'] ?? e)))
           .toList()
         : null;
 

packages/appsync-modelgen-plugin/src/visitors/appsync-dart-visitor.ts

@@ -746,7 +746,9 @@ export class AppSyncModelDartVisitor<
                 `${fieldName} = json['${varName}'] is List`,
                 indent(`? (json['${varName}'] as List)`),
                 indent(`.where((e) => e != null)`, 2),
-                indent(`.map((e) => ${this.getNativeType({ ...field, isList: false })}.fromJson(new Map<String, dynamic>.from(e)))`, 2),
+                indent(`.map((e) => ${this.getNativeType({ ...field, isList: false })}.fromJson(new Map<String, dynamic>.from(${
+                  this.isNonModelType(field) ? "e['serializedData'] ?? e" : 'e'
+                })))`, 2),
                 indent(`.toList()`, 2),
                 indent(`: null`),
               ]
@@ -756,8 +758,10 @@ export class AppSyncModelDartVisitor<
             // single non-model i.e. embedded
             return [
               `${fieldName} = json['${varName}'] != null`,
-              indent(`? ${this.getNativeType(field)}.fromJson(new Map<String, dynamic>.from(json['${varName}']))`),
-              indent(`: null`),
+              indent(`? json['${varName}']['serializedData'] != null`, 2),
+              indent(`? ${this.getNativeType(field)}.fromJson(new Map<String, dynamic>.from(json['${varName}']['serializedData']))`, 4),
+              indent(`: ${this.getNativeType(field)}.fromJson(new Map<String, dynamic>.from(json['${varName}']))`, 4),
+              indent(`: null`,),
             ].join('\n');
           }
           //regular type