Laravel - 如何将外键用于具有标识外键的表？

Question

So I have three tables: users , candidates and logs . Now candidates does not have its own id, it has an identifying foreign key user_id . Looking much like this:

-users-
id
name
etc.

-candidates-
user_id
type
etc.

Now I want to have a table logs that has a one-to-many relation with candidates , being that a candidate can have zero or more logs . So I want to have a foreign key to candidates , something like candidate_id . However, putting it like this and Laravel won't automagically understand the relation. What should I name the foreign key from logs to candidates to make Laravel understand the relationship?

Answer 1

I think the simplest thing would be to give candidates its own incremental id and then have two relationship tables, candidate_user and candidate_log. It would be set up according to Laravel docs

Answer 2

Your candidates table must have a primary key.

There's no need to have an incremental ID, but you shouldn't leave the table without a primary key.

Once you define a primary key, you can use it as your reference.

Laravel will try to guess your foreign_key name:

https://laravel.com/docs/5.2/eloquent-relationships#one-to-many

Remember, Eloquent will automatically determine the proper foreign key column on the Comment model. By convention, Eloquent will take the "snake case" name of the owning model and suffix it with _id. So, for this example, Eloquent will assume the foreign key on the Comment model is post_id.

If your primary key is not the "id" column, you should use the protected $primaryKey and the public $incrementing properties to describe your primary key in your Eloquent Model.