feat: add api

app/apps/api/serializers/currencies.py

@@ -0,0 +1,29 @@
+from rest_framework import serializers
+from apps.currencies.models import Currency, ExchangeRate
+
+
+class CurrencySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Currency
+        fields = "__all__"
+
+
+class ExchangeRateSerializer(serializers.ModelSerializer):
+    # For read operations (GET)
+    from_currency = CurrencySerializer(read_only=True)
+
+    # For write operations (POST, PUT, PATCH)
+    from_currency_id = serializers.PrimaryKeyRelatedField(
+        queryset=Currency.objects.all(), source="from_currency", write_only=True
+    )
+
+    to_currency = CurrencySerializer(read_only=True)
+
+    # For write operations (POST, PUT, PATCH)
+    to_currency_id = serializers.PrimaryKeyRelatedField(
+        queryset=Currency.objects.all(), source="from_currency", write_only=True
+    )
+
+    class Meta:
+        model = ExchangeRate
+        fields = "__all__"