refa: article (#757)

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/dynamics/opus_detail/data.dart

@@ -0,0 +1,26 @@
+import 'fallback.dart';
+import 'item.dart';
+
+class OpusData {
+  Item? item;
+  Fallback? fallback;
+
+  OpusData({
+    this.item,
+    this.fallback,
+  });
+
+  factory OpusData.fromJson(Map<String, dynamic> json) => OpusData(
+        item: json['item'] == null
+            ? null
+            : Item.fromJson(json['item'] as Map<String, dynamic>),
+        fallback: json['fallback'] == null
+            ? null
+            : Fallback.fromJson(json['fallback']),
+      );
+
+  Map<String, dynamic> toJson() => {
+        'item': item?.toJson(),
+        'fallback': fallback?.toJson(),
+      };
+}