Differences between belongsto and hasone

hasOne Positive correlation ,belongsTo Reverse correlation .
In short, it's , No big difference , It's just a deviation in logic （ Logical rationality ）.
belongsTo： It can be understood as belonging to
hasOne： It can be understood as having

First , We create two tables .
user surface Field id name password Field
user_address surface id user_id city Field
It's not hard to see. ,user_address Is based on user Extended tables . We can say ,user Have user_address The foreign key ,user_address Foreign key for user.

User Association in the model user_address When using tables hasOne
UserAddress Association in the model user When using tables belongsTo

You can understand ：
I （User） Have （hasOne） A it （user_address）, I （user_address） Belong to （belongsTo） it （User）.