关于在django中返回单个对象的建议

I am working on an online food ordering service and i have worked on most of the functionality. At the moment on request, i want the app to be able to return the menu of a given restaurant as requested by user. Am thinking the logic has something to do with the Primary Key but i don't know how to go about this. Thank you in advance and have a blessed christmas..I am working on an online food ordering service