Refactor the log entry form in the gym mode.

Previously due to rebuilds the form would e.g. not stay open after
selecting a new unit (which would also not change)

lib/models/workouts/log.dart

@@ -101,16 +101,16 @@ class Log {
     this.repetitions,
     this.repetitionsTarget,
     this.repetitionsUnitId = REP_UNIT_REPETITIONS_ID,
+    this.repetitionsUnitObj,
     this.rir,
     this.rirTarget,
     this.weight,
     this.weightTarget,
     this.weightUnitId = WEIGHT_UNIT_KG,
+    this.weightUnitObj,
     DateTime? date,
   }) : date = date ?? DateTime.now();
 
-  Log.empty();
-
   Log.fromSetConfigData(SetConfigData setConfig) {
     date = DateTime.now();
     sessionId = null;
@@ -142,9 +142,11 @@ class Log {
     num? repetitions,
     num? repetitionsTarget,
     int? repetitionsUnitId,
+    RepetitionUnit? repetitionsUnitObj,
     num? weight,
     num? weightTarget,
     int? weightUnitId,
+    WeightUnit? weightUnitObj,
     DateTime? date,
   }) {
     final out = Log(
@@ -156,11 +158,13 @@ class Log {
       repetitions: repetitions ?? this.repetitions,
       repetitionsTarget: repetitionsTarget ?? this.repetitionsTarget,
       repetitionsUnitId: repetitionsUnitId ?? this.repetitionsUnitId,
+      repetitionsUnitObj: repetitionsUnitObj ?? this.repetitionsUnitObj,
       rir: rir ?? this.rir,
       rirTarget: rirTarget ?? this.rirTarget,
       weight: weight ?? this.weight,
       weightTarget: weightTarget ?? this.weightTarget,
       weightUnitId: weightUnitId ?? this.weightUnitId,
+      weightUnitObj: weightUnitObj ?? this.weightUnitObj,
       date: date ?? this.date,
     );
 
@@ -168,9 +172,16 @@ class Log {
       out.sessionId = sessionId;
     }
 
+    if (repetitionsUnitObj != null) {
+      out.repetitionsUnitObj = repetitionsUnitObj;
+      out.repetitionsUnitId = repetitionsUnitObj.id;
+    }
+
+    if (weightUnitObj != null) {
+      out.weightUnitObj = weightUnitObj;
+      out.weightUnitId = weightUnitObj.id;
+    }
     out.exerciseBase = exercise;
-    out.repetitionUnit = repetitionsUnitObj;
-    out.weightUnitObj = weightUnitObj;
 
     return out;
   }

lib/models/workouts/repetition_unit.dart

@@ -1,6 +1,6 @@
 /*
  * This file is part of wger Workout Manager <https://github.com/wger-project>.
- * Copyright (C) 2020, 2021 wger Team
+ * Copyright (c) 2020 - 2026 wger Team
  *
  * wger Workout Manager is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -32,7 +32,7 @@ class RepetitionUnit {
 
   @override
   String toString() {
-    return 'RepetitionUnit{id: $id, name: $name}';
+    return 'RepetitionUnit(id: $id, name: $name)';
   }
 
   // Boilerplate

lib/models/workouts/weight_unit.dart

@@ -1,6 +1,6 @@
 /*
  * This file is part of wger Workout Manager <https://github.com/wger-project>.
- * Copyright (C) 2020, 2021 wger Team
+ * Copyright (c) 2020 - 2026 wger Team
  *
  * wger Workout Manager is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -30,6 +30,11 @@ class WeightUnit {
 
   const WeightUnit({required this.id, required this.name});
 
+  @override
+  String toString() {
+    return 'WeightUnit(id: $id, name: $name)';
+  }
+
   // Boilerplate
   factory WeightUnit.fromJson(Map<String, dynamic> json) => _$WeightUnitFromJson(json);
   Map<String, dynamic> toJson() => _$WeightUnitToJson(this);