feat(api): make category and tags create or get

app/apps/api/serializers/transactions.py

@@ -1,7 +1,10 @@
+from django.utils.translation import gettext_lazy as _
+
 from rest_framework import serializers
 from rest_framework.permissions import IsAuthenticated
 
 from apps.accounts.models import Account
+from apps.api.fields.transactions import TransactionTagField, TransactionCategoryField
 from apps.api.serializers.accounts import AccountSerializer
 from apps.transactions.models import (
     Transaction,
@@ -37,8 +40,9 @@ class InstallmentPlanSerializer(serializers.ModelSerializer):
 
 
 class TransactionSerializer(serializers.ModelSerializer):
-    category_name = serializers.CharField(source="category.name", read_only=True)
-    tags = TransactionTagSerializer(many=True, read_only=True)
+    category = TransactionCategoryField(required=False)
+    tags = TransactionTagField(required=False)
+
     exchanged_amount = serializers.SerializerMethodField()
 
     # For read operations (GET)
@@ -49,11 +53,45 @@ class TransactionSerializer(serializers.ModelSerializer):
         queryset=Account.objects.all(), source="account", write_only=True
     )
 
+    reference_date = serializers.DateField(required=False)
+
     permission_classes = [IsAuthenticated]
 
     class Meta:
         model = Transaction
         fields = "__all__"
+        read_only_fields = [
+            "id",
+            "installment_plan",
+            "recurring_transaction",
+            "installment_id",
+        ]
+
+    def validate(self, data):
+        if "date" in data and "reference_date" not in data:
+            data["reference_date"] = data["date"].replace(day=1)
+        elif "reference_date" in data:
+            data["reference_date"] = data["reference_date"].replace(day=1)
+        else:
+            raise serializers.ValidationError(
+                _("Either 'date' or 'reference_date' must be provided.")
+            )
+        return data
+
+    def create(self, validated_data):
+        tags = validated_data.pop("tags", [])
+        transaction = Transaction.objects.create(**validated_data)
+        transaction.tags.set(tags)
+        return transaction
+
+    def update(self, instance, validated_data):
+        tags = validated_data.pop("tags", None)
+        for attr, value in validated_data.items():
+            setattr(instance, attr, value)
+        instance.save()
+        if tags is not None:
+            instance.tags.set(tags)
+        return instance
 
     @staticmethod
     def get_exchanged_amount(obj):