adding

apps/bizapps/api/serializers.py

@@ -0,0 +1,58 @@
+from rest_framework import serializers
+
+from apps.bizapps.models import Appointment, Customer, LedgerEntry, Product, StockMovement
+
+
+class CustomerSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Customer
+        fields = ["id", "name", "phone", "email", "address", "notes", "updated_at"]
+        read_only_fields = ["updated_at"]
+
+
+class LedgerEntrySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = LedgerEntry
+        fields = ["id", "entry_type", "title", "amount", "category", "entry_date", "note", "updated_at"]
+        read_only_fields = ["updated_at"]
+
+
+class ProductSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Product
+        fields = [
+            "id",
+            "name",
+            "sku",
+            "category",
+            "quantity",
+            "unit_price",
+            "low_stock_threshold",
+            "notes",
+            "updated_at",
+        ]
+        read_only_fields = ["updated_at"]
+
+
+class StockMovementSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = StockMovement
+        fields = ["id", "delta", "quantity_after", "note", "created_at"]
+        read_only_fields = fields
+
+
+class AdjustStockSerializer(serializers.Serializer):
+    delta = serializers.FloatField()
+    note = serializers.CharField(max_length=255, required=False, allow_blank=True, default="")
+
+    def validate_delta(self, value):
+        if value == 0:
+            raise serializers.ValidationError("مقدار تغییر نمی‌تواند صفر باشد.")
+        return value
+
+
+class AppointmentSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Appointment
+        fields = ["id", "customer_name", "customer_phone", "title", "start_at", "status", "notes", "updated_at"]
+        read_only_fields = ["updated_at"]