Can Laravel hasOne be used with belongsToMany?

问题

Let's say I have two tables:

Users: id, name, country_id

Countries: id, name

Of course each user can only have one country, but each country is assigned to multiple users.

So would it be safe to have a User model that utilizes hasOne and a Country model that uses belongsToMany method?

Documentation makes it seem like you can't mix and match different types of relationships.

回答1:

What you are describing is actually a One To Many relationship, where one country has many users. Your Country model should utilize a hasMany relationship, while your user would have a belongsTo relationship.

回答2:

@Andy has already answered well.
Anyway, my advice is to always think in the following way to create a One-To-One, One-To-Many, or a Many-To-Many relationship:

• In the table with the foreign key (if any) use belongsTo
• In the other table without the foreign key use hasOne or hasMany
• In any of them have a foreign key, you have a Many To Many relationship and you must use belongsToMany in both of them (you need the pivot table, of course).

来源：https://stackoverflow.com/questions/34598287/can-laravel-hasone-be-used-with-belongstomany