app/Models/Item.php

@@ -64,6 +64,11 @@ class Item extends Model
         return $this->hasMany(CharacteristicValue::class);
     }
 
+    public function ClassCharacteristics()
+    {
+        return $this->hasMany(ClassCharacteristic::class, 'item_id', 'id');
+    }
+
     public function weightValidations()
     {
         return $this->hasMany(WeightValidation::class);

app/Models/Machine.php

@@ -43,6 +43,11 @@ class Machine extends Model
         return $this->hasMany(CharacteristicValue::class);
     }
 
+    public function ClassCharacteristics()
+    {
+        return $this->hasMany(ClassCharacteristic::class, 'machine_id', 'id');
+    }
+
     public function testingPanelReadings()
     {
         return $this->hasMany(TestingPanelReading::class);

app/Models/Plant.php

@@ -113,6 +113,11 @@ class Plant extends Model
         return $this->hasMany(EquipmentMaster::class, 'plant_id', 'id');
     }
 
+    public function ClassCharacteristics()
+    {
+        return $this->hasMany(ClassCharacteristic::class, 'plant_id', 'id');
+    }
+
     // public function rejectReasons()
     // {
     //     return $this->hasMany(RejectReason::class, 'plant_id', 'id');