set trip to null, not 0

lib/objects/objects.dart

@@ -140,7 +140,7 @@ class LocoSummary extends Loco {
     required String locoType,
     required String locoNumber,
     required String locoName,
-    required String locoClass,
+    required super.locoClass,
     required String locoOperator,
     String? locoNotes,
     String? locoEvn,
@@ -153,43 +153,41 @@ class LocoSummary extends Loco {
     this.livery,
     this.location,
     Map<String, dynamic>? extra,
-  })  : extra = extra ?? const {},
-        super(
+  }) : extra = extra ?? const {},
+       super(
          id: locoId,
          type: locoType,
          number: locoNumber,
          name: locoName,
-         locoClass: locoClass,
          operator: locoOperator,
          notes: locoNotes,
          evn: locoEvn,
        );
 
   factory LocoSummary.fromJson(Map<String, dynamic> json) => LocoSummary(
-        locoId: json['loco_id'] ?? json['id'] ?? 0,
-        locoType: json['type'] ?? json['loco_type'] ?? '',
-        locoNumber: json['number'] ?? json['loco_number'] ?? '',
-        locoName: json['name'] ?? json['loco_name'] ?? "",
-        locoClass: json['class'] ?? json['loco_class'] ?? '',
-        locoOperator: json['operator'] ?? json['loco_operator'] ?? '',
-        locoNotes: json['notes'],
-        locoEvn: json['evn'] ?? json['loco_evn'],
-        mileage: ((json['loco_mileage'] ?? json['mileage']) as num?)
-                ?.toDouble() ??
-            0,
-        journeys: (json['loco_journeys'] ?? json['journeys'] ?? 0) is num
-            ? (json['loco_journeys'] ?? json['journeys'] ?? 0).toInt()
-            : 0,
-        trips: (json['loco_trips'] ?? json['trips']) is num
-            ? (json['loco_trips'] ?? json['trips']).toInt()
-            : null,
-        status: json['status'] ?? json['loco_status'],
-        domain: json['domain'],
-        owner: json['owner'] ?? json['loco_owner'],
-        livery: json['livery'],
-        location: json['location'],
-        extra: Map<String, dynamic>.from(json),
-      );
+    locoId: json['loco_id'] ?? json['id'] ?? 0,
+    locoType: json['type'] ?? json['loco_type'] ?? '',
+    locoNumber: json['number'] ?? json['loco_number'] ?? '',
+    locoName: json['name'] ?? json['loco_name'] ?? "",
+    locoClass: json['class'] ?? json['loco_class'] ?? '',
+    locoOperator: json['operator'] ?? json['loco_operator'] ?? '',
+    locoNotes: json['notes'],
+    locoEvn: json['evn'] ?? json['loco_evn'],
+    mileage:
+        ((json['loco_mileage'] ?? json['mileage']) as num?)?.toDouble() ?? 0,
+    journeys: (json['loco_journeys'] ?? json['journeys'] ?? 0) is num
+        ? (json['loco_journeys'] ?? json['journeys'] ?? 0).toInt()
+        : 0,
+    trips: (json['loco_trips'] ?? json['trips']) is num
+        ? (json['loco_trips'] ?? json['trips']).toInt()
+        : null,
+    status: json['status'] ?? json['loco_status'],
+    domain: json['domain'],
+    owner: json['owner'] ?? json['loco_owner'],
+    livery: json['livery'],
+    location: json['location'],
+    extra: Map<String, dynamic>.from(json),
+  );
 }
 
 class LeaderboardEntry {
@@ -353,24 +351,23 @@ class TripLeg {
   });
 
   factory TripLeg.fromJson(Map<String, dynamic> json) => TripLeg(
-        id: json['leg_id'],
-        start: json['leg_start'] ?? '',
-        end: json['leg_end'] ?? '',
-        beginTime:
-            json['leg_begin_time'] != null && json['leg_begin_time'] is String
-                ? DateTime.tryParse(json['leg_begin_time'])
-                : (json['leg_begin_time'] is DateTime
-                    ? json['leg_begin_time']
-                    : null),
-        network: json['leg_network'],
-        route: json['leg_route'],
-        mileage: (json['leg_mileage'] as num?)?.toDouble(),
-        notes: json['leg_notes'],
-        locos: (json['locos'] as List?)
-                ?.map((e) => Loco.fromJson(e as Map<String, dynamic>))
-                .toList() ??
-            [],
-      );
+    id: json['leg_id'],
+    start: json['leg_start'] ?? '',
+    end: json['leg_end'] ?? '',
+    beginTime:
+        json['leg_begin_time'] != null && json['leg_begin_time'] is String
+        ? DateTime.tryParse(json['leg_begin_time'])
+        : (json['leg_begin_time'] is DateTime ? json['leg_begin_time'] : null),
+    network: json['leg_network'],
+    route: json['leg_route'],
+    mileage: (json['leg_mileage'] as num?)?.toDouble(),
+    notes: json['leg_notes'],
+    locos:
+        (json['locos'] as List?)
+            ?.map((e) => Loco.fromJson(e as Map<String, dynamic>))
+            .toList() ??
+        [],
+  );
 }
 
 class TripDetail {
@@ -389,14 +386,14 @@ class TripDetail {
   });
 
   factory TripDetail.fromJson(Map<String, dynamic> json) => TripDetail(
-        id: json['trip_id'] ?? 0,
-        name: json['trip_name'] ?? '',
-        mileage: (json['trip_mileage'] as num?)?.toDouble() ?? 0,
-        legCount: json['leg_count'] ??
-            ((json['trip_legs'] as List?)?.length ?? 0),
-        legs: (json['trip_legs'] as List?)
-                ?.map((e) => TripLeg.fromJson(e as Map<String, dynamic>))
-                .toList() ??
-            [],
-      );
+    id: json['trip_id'] ?? 0,
+    name: json['trip_name'] ?? '',
+    mileage: (json['trip_mileage'] as num?)?.toDouble() ?? 0,
+    legCount: json['leg_count'] ?? ((json['trip_legs'] as List?)?.length ?? 0),
+    legs:
+        (json['trip_legs'] as List?)
+            ?.map((e) => TripLeg.fromJson(e as Map<String, dynamic>))
+            .toList() ??
+        [],
+  );
 }