laravel relationship (one to one , one-to-many )

One to one relationship

One to one relationship provides the one-to-one relationship between the columns of different tables. For example, every user is associated with a single post or maybe multiple posts, but in this relationship, we will retrieve the single post of a user. To define a relationship, we need first to define the post() method in User model. In the post() method, we need to implement the hasOne() method that returns the result.

public function post(){  

return $this->hasOne('App\Post');  

}  

Inverse Relation

Inverse relation means the inverse of the one-to-one relationship. In the above, we have retrieved the post belonging to a particular user. Now, we retrieve the user information based on the post.

public function user()  {  

return $this->belongsTo('App\User');  

} 

One-to-many relationship

Laravel also provides a one-to-many relationship.

public function posts()  {  

return $this->hasMany('App\Post','user_id');  

}