How to use relations(foreign key, Many-to-many) in models?

Question

Django

I read the documentation on djbook, but I could not quite understand how it works. FK is one to many and M-to-M is many to many.
For example, there is a task to implement the ability to add friends or exchange messages. How can you do this with these relationships in models?
Thanks in advance.

Answer 1

ForeignKey - https://docs.djangoproject.com/en/1.10/ref/models/...
ManyToManyField - https://docs.djangoproject.com/en/1.10/ref/models/...