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lib/model/magazine.dart

@@ -1,3 +1,5 @@
+import 'package:flutter/cupertino.dart';
+
 class Magazine {
   final String uid;
   final String title;
@@ -19,9 +21,9 @@ class Magazine {
     this.publishedAt,
     this.createdAt,
     this.updatedAt,
-    this.summaryText,
+    @required this.summaryText,
     this.summaryUrl,
-    this.magazineUrl,
+    @required this.magazineUrl,
     this.uidCategory,
   });
 }