Laravel中的hasOne关系不起作用？

Question

I have a one to one relationship I am trying to get to work in laravel .

I have a user and an alert table I am trying to use.

Primarykey of Use r table is id and another id in there is called id_custom . In the Alerts table I have id_custom as the primary key.

Here is the relationship in the users model:

   public function alerts()
   {
       return $this->hasOne('Alerts', 'id_custom');
   }   

Here is the alerts model:

class Alerts extends Eloquent
{

    /**
     *
     *
     * The database table used by the model.
     *
     *
     *
     * @var string
     *
     */
    protected $table = 'alerts';
    protected $primaryKey = 'id_custom';

    /**
     *
     *
     * The attributes excluded from the model's JSON form.
     *
     *
     *
     * @var array
     *
     */
    protected $hidden = array();
    public $timestamps = false;
}

Than in a view I am trying to do Auth::user()->alerts->profit (where profit is a column in the Alerts table.

What am I doing wrong?

Answer 1

Your hasOne method is currently looking for user_id in your alerts table. You need to explicitly set the foreign and local key you're looking for.

return $this->hasOne('Model', 'foreign_key', 'local_key');

Source

In your instance if would be

return $this->hasOne('Alerts', 'id_custom', 'id');

You would make things much tidier for yourself if you changed the User attribute id_custom to alert_id .

Then you could change the method in your User.php model to alert and do:

public function alert()
{
    return $this->hasOne('Alerts');
}