from rest_framework import serializers
from .models import Coaster


class CoasterSerializer(serializers.ModelSerializer):
    creator_username = serializers.ReadOnlyField(source='creator.username')

    class Meta:
        model = Coaster
        fields = [
            'id', 'creator_username', 'challenge', 'name',
            'anchors', 'acceleration_strips', 'created_at', 'updated_at',
        ]
        read_only_fields = ['id', 'creator_username', 'created_at', 'updated_at']