Setting relationships for an already existing db in Django?

Question

Django

There is a ready-made Sqlite database, you need to connect it to a Django project, I found how to create models using it , but I just can’t figure out how to register links between models. When I wrote in php I used yii, there the links were written in this form:

public function getCategory(){
    return $this->hasOne(Category::className(), ['id' => 'category_id']);
}

In Django, the relationship is set up like this:

company_that_makes_it = models.ForeignKey(
    Manufacturer,
    on_delete=models.CASCADE,
)

Is there any way to specify the fields that need to be linked?

Answer 1

Is there a way to add fields

Why do you want to do this, what problem do you want to solve?
1. For ForeignKey it is assumed that company_that_makes_it will correspond to the real field company_that_makes_it _id , you can also explicitly specify the field in the database through db_column.
2. ForeignKey will establish a relationship with the primary key Manufacturer, i.e. the field that you mark there like that (well, of course it should be in the database as well)