Can anyone please help me solve this question?

[Anirudh Jain]

Here is the question that I posted earlier yesterday and it is still unsolved

https://stackoverflow.com/questions/52054246/how-to-add-a-foreign-key-from-multiple-options-available-in-model-for-that-key-i

It is very urgent for me to solve this question and this is the last part where I am stuck while building a product. Please help me solve the question.