cx-library-manager/server_source/single_set_manager.py

from .manager import manager
from .single_set_model import single_set_model

class single_set_manager(manager):
    def add(self, target: str) -> single_set_model:
        target_model = self._get_target_model()
        
        result = await target_model \
        .filter(target_model.content = target) \
        .first()

        if result is None:
            result = self._create(target)