Laravel One-to-One relationship not working - php

Question

I have 2 database tables => mobile_phones , mobile_users
Schema for mobile_phones
phone_id (primary key , auto_increment)
phone_name (varchar(150))
phone_model (int (11))
Schema for mobile_users
user_id (primary key , auto_increment)
username (varchar(150))
mobile_phone_id (foreign key referencing mobile_phones(phone_id))
Model class for mobile_phones
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class MobilePhone extends Model
{
protected $primaryKey = "phone_id";
public $timestamps = false;
protected $table = "mobile_phones";
protected $fillable = array("phone_name","phone_model");
public function mobileUser()
{
return $this->hasOne("MobileUser","mobile_phone_id");
}
}
Model class for mobile_users
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class MobileUser extends Model
{
protected $primaryKey = "user_id";
public $timestamps = false;
protected $table = "mobile_users";
protected $fillable = array("username","mobile_phone_id");
public function mobilePhone()
{
return $this->belongsTo("MobilePhone","phone_id");
}
}
I am trying to establish One-to-One relationship between MobileUser and MobilePhone models but it isn't happening. Below is my code in Controller's action -
public function query()
{
$getUsername = MobilePhone::find(1)->username;
echo $getUsername;
}
The above code gives me NULL when I do a var_dump()
I did check similar questions on SO and they used with() (but this isn't necessary). I am referring Laravel 5.2 docs and they state that we can access relate record in another relation using Eloquent's dynamic properties. Link to that docs is here
Please Help !!

Answer 1

You need to call the function of your model so do the following
public function query()
{
$getUsername = MobilePhone::find(1)->mobileusers;
echo $getUsername->username;
}

Answer 2

When doing this:
public function query()
{
$getUsername = MobilePhone::find(1)->username;
echo $getUsername;
}
You try to access a username property out of a MobilePhone number, which is incorrect.
Try this:
public function query()
{
$getUsername = MobilePhone::find(1)->mobileUser->username;
echo $getUsername;
}
Also I encourage you to use the with statement as it will preload all dependencies needed (means 1 single query) instead of eager loading it (many queries)

Answer 3

Something like this :
public function query()
{
$getUsername = MobilePhone::find(1)->mobileUser;
echo $getUsername->username;
}