barely functional database with hive

lib/models/unit.dart

@@ -4,6 +4,18 @@ class Unit {
   final System system;
 
   Unit(this.name, this.type, {this.system = System.metric});
+
+  factory Unit.fromJson(Map<String, dynamic> json) => Unit(
+        json['name'] as String,
+        json['type'] as UnitType,
+        system: json['system'] as System,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'name': name,
+        'type': type,
+        'system': system,
+      };
 }
 
 enum System { metric, imperial, neutral }