dynamite: Support JSON encoded string fields as per spec

packages/dynamite/lib/src/models/schema.dart

@@ -1,4 +1,3 @@
-import 'package:dynamite/src/models/media_type.dart';
 import 'package:json_annotation/json_annotation.dart';
 
 part 'schema.g.dart';
@@ -20,7 +19,8 @@ class Schema {
     this.required,
     this.items,
     this.additionalProperties,
-    this.content,
+    this.contentMediaType,
+    this.contentSchema,
   });
 
   factory Schema.fromJson(final Map<String, dynamic> json) => _$SchemaFromJson(json);
@@ -59,7 +59,9 @@ class Schema {
 
   final bool? additionalProperties;
 
-  final Map<String, MediaType>? content;
+  final String? contentMediaType;
 
-  bool get isJsonString => type == 'string' && content?['application/json']?.schema != null;
+  final Schema? contentSchema;
+
+  bool get isJsonString => type == 'string' && contentMediaType == 'application/json' && contentSchema != null;
 }

packages/dynamite/lib/src/models/schema.g.dart

@@ -24,7 +24,8 @@ Schema _$SchemaFromJson(Map<String, dynamic> json) {
       'required',
       'items',
       'additionalProperties',
-      'content'
+      'contentMediaType',
+      'contentSchema'
     ],
   );
   return Schema(
@@ -44,9 +45,9 @@ Schema _$SchemaFromJson(Map<String, dynamic> json) {
     required: (json['required'] as List<dynamic>?)?.map((e) => e as String).toList(),
     items: json['items'] == null ? null : Schema.fromJson(json['items'] as Map<String, dynamic>),
     additionalProperties: json['additionalProperties'] as bool?,
-    content: (json['content'] as Map<String, dynamic>?)?.map(
+    contentMediaType: json['contentMediaType'] as String?,
-      (k, e) => MapEntry(k, MediaType.fromJson(e as Map<String, dynamic>)),
+    contentSchema:
-    ),
+        json['contentSchema'] == null ? null : Schema.fromJson(json['contentSchema'] as Map<String, dynamic>),
   );
 }
 
@@ -73,6 +74,7 @@ Map<String, dynamic> _$SchemaToJson(Schema instance) {
   writeNotNull('required', instance.required);
   writeNotNull('items', instance.items?.toJson());
   writeNotNull('additionalProperties', instance.additionalProperties);
-  writeNotNull('content', instance.content?.map((k, e) => MapEntry(k, e.toJson())));
+  writeNotNull('contentMediaType', instance.contentMediaType);
+  writeNotNull('contentSchema', instance.contentSchema?.toJson());
   return val;
 }

packages/dynamite/lib/src/openapi_builder.dart

@@ -1332,7 +1332,7 @@ TypeResult resolveType(
             spec,
             state,
             identifier,
-            schema.content!['application/json']!.schema!,
+            schema.contentSchema!,
             extraJsonSerializableValues: extraJsonSerializableValues,
           );
           break;