Added writeable nested serialziers to accept array of items into the invoice API

invoice/serializers.py

@@ -1,4 +1,5 @@
 from rest_framework import serializers
+from drf_writable_nested.serializers import WritableNestedModelSerializer
 from .models import Item, Invoice
 
 
@@ -8,8 +9,8 @@ class ItemSerializer(serializers.ModelSerializer):
         fields = ['id', 'name', 'amount', 'quantity', 'invoice', 'item_total']
 
 
-class InvoiceSerializer(serializers.ModelSerializer):
-    items = ItemSerializer(many=True, read_only=True)
+class InvoiceSerializer(WritableNestedModelSerializer):
+    items = ItemSerializer(many=True)
 
     class Meta:
         model = Invoice