relationship(foreign key or many to many) betweeen the creating from the frontend to the backend

good morning,  everyone  i have this project that I'm working on ,the project is foodapp where food vendor can register their eatery and customers will register and then  place their order  I'm using django,drf for backend and nextjs for frontend but the problem I'm having is that,I can't create something with that has relation shipwith other tables in the django model for example the restaurant and menu item has relation which is foreignkey  but when i create the  menu item from the frontend it will return 500 or 401 but when I create with drf it works, how can i connect my backend  with tables that share realtionship(foreignkey) to the frontend so that i can post(create) from the frontend to the backend

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