prvi kod za live uporabu

backend/modules/task_management/serializers.py

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+# backend/modules/task_management/serializers.py
+
+from rest_framework import serializers
+from .models import Task
+
+class TaskSerializer(serializers.ModelSerializer):
+    assigned_to_name = serializers.SerializerMethodField()
+    work_order_label = serializers.SerializerMethodField()
+    vehicle_registration = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Task
+        fields = [
+            'id', 'title', 'description', 'status',
+            'assigned_to', 'assigned_to_name',
+            'vehicle', 'vehicle_registration',
+            'work_order', 'work_order_label',
+            'created_at',
+        ]
+        read_only_fields = ['id', 'created_at']
+
+    def validate_title(self, value):
+        """Primjer custom validacije: naziv ne smije biti prekratak."""
+        if len(value) < 3:
+            raise serializers.ValidationError("Naslov zadatka mora imati barem 3 znaka.")
+        return value
+
+    def validate(self, attrs):
+        current = getattr(self, 'instance', None)
+        status_value = attrs.get('status', getattr(current, 'status', 'aktivan'))
+        work_order = attrs.get('work_order', getattr(current, 'work_order', None))
+        vehicle = attrs.get('vehicle', getattr(current, 'vehicle', None))
+
+        if current is None and not vehicle:
+            raise serializers.ValidationError({
+                'vehicle': "Dizalica je obavezna pri kreiranju taska."
+            })
+
+        if work_order and not vehicle:
+            vehicle = work_order.vehicle
+            attrs['vehicle'] = vehicle
+        if work_order and vehicle and work_order.vehicle_id != vehicle.id:
+            raise serializers.ValidationError({
+                'work_order': "Putni nalog mora pripadati istoj dizalici kao task."
+            })
+
+        if status_value == 'neaktivan' and not work_order:
+            raise serializers.ValidationError({
+                'work_order': "Putni nalog je obavezan prije zatvaranja zadatka."
+            })
+        return attrs
+
+    def get_work_order_label(self, obj):
+        if not obj.work_order_id:
+            return None
+        return f"PN-{str(obj.work_order_id).split('-')[0].upper()}"
+
+    def get_assigned_to_name(self, obj):
+        if not obj.assigned_to_id:
+            return None
+        full_name = obj.assigned_to.get_full_name()
+        if full_name:
+            return full_name
+        email = getattr(obj.assigned_to, 'email', None)
+        if email:
+            return email
+        username = getattr(obj.assigned_to, 'username', None)
+        if username:
+            return username
+        return str(obj.assigned_to_id)
+
+    def get_vehicle_registration(self, obj):
+        if not obj.vehicle_id:
+            return None
+        return obj.vehicle.registration_number