feat: add api

app/apps/api/serializers/transactions.py

@@ -0,0 +1,60 @@
+from rest_framework import serializers
+from rest_framework.permissions import IsAuthenticated
+
+from apps.accounts.models import Account
+from apps.api.serializers.accounts import AccountSerializer
+from apps.transactions.models import (
+    Transaction,
+    TransactionCategory,
+    TransactionTag,
+    InstallmentPlan,
+)
+
+
+# Create serializers for other related models as needed
+class TransactionCategorySerializer(serializers.ModelSerializer):
+    permission_classes = [IsAuthenticated]
+
+    class Meta:
+        model = TransactionCategory
+        fields = "__all__"
+
+
+class TransactionTagSerializer(serializers.ModelSerializer):
+    permission_classes = [IsAuthenticated]
+
+    class Meta:
+        model = TransactionTag
+        fields = "__all__"
+
+
+class InstallmentPlanSerializer(serializers.ModelSerializer):
+    permission_classes = [IsAuthenticated]
+
+    class Meta:
+        model = InstallmentPlan
+        fields = "__all__"
+
+
+class TransactionSerializer(serializers.ModelSerializer):
+    category_name = serializers.CharField(source="category.name", read_only=True)
+    tags = TransactionTagSerializer(many=True, read_only=True)
+    exchanged_amount = serializers.SerializerMethodField()
+
+    # For read operations (GET)
+    account = AccountSerializer(read_only=True)
+
+    # For write operations (POST, PUT, PATCH)
+    account_id = serializers.PrimaryKeyRelatedField(
+        queryset=Account.objects.all(), source="account", write_only=True
+    )
+
+    permission_classes = [IsAuthenticated]
+
+    class Meta:
+        model = Transaction
+        fields = "__all__"
+
+    @staticmethod
+    def get_exchanged_amount(obj):
+        return obj.exchanged_amount()