Okay, I'm working through the Laravel 4 docs to setup a one-to-many relationship between two models. Obviously, one side should use hasMany(). But for the other side, should I use hasOne or belongsTo? Does it matter? What's difference? Why do both exist?Okay, I'm working through the Laravel 4 docs to
阅读背景：
阐明如何在Laravel的Eloquent ORM中建立一对多的关系
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