我应该在 Laravel 中使用belongsTo 还是hasOne？
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Should i use belongsTo or hasOne in Laravel?
提问by wolfgang
Consider two models Aand B
考虑两个模型A和B
A-> relatedTo Bis a one to onerelationship
A-> relatedToB是一个one to one关系
What is the difference in using (A ->hasOne-- B) and (A ->belongsTo-- B)?
使用 (A -> hasOne-- B) 和 (A -> belongsTo-- B) 有什么区别？
Can I use them interchangeably?
我可以互换使用它们吗？
回答by user1669496
No, the difference depends on where your foreign key is.
不，区别取决于您的外键在哪里。
In your example, if Ahas a b_idcolumn, then AbelongsToB.
在您的示例中，如果A有一b_id列，则AbelongsToB.
If Bhas an a_idcolumn, then AhasOneor hasManyBdepending on how many Bshould have.
如果B有a_id列，则AhasOne或hasManyB取决于B应该有多少列。
回答by Abid Ali
Main difference is as below:
主要区别如下：
belongsToand belongsToMany- you're telling Laravel that this table holds the foreign key that connects it to the other table.
belongsTo并且belongsToMany- 你告诉 Laravel 这个表包含将它连接到另一个表的外键。
hasOneand hasMany- you're telling Laravel that this table does not have the foreign key.
hasOne并且hasMany- 你告诉 Laravel 这个表没有外键。
