In this article, we will see one to one relationship in laravel 9 example. A one-to-one relationship is a very basic type of database relationship. You have one table with a primary key that references the id of the other table.
For one to one relationships use hasOne and belongsTo
the method in the model for access to each other model. Also, you can use one to one relationship in laravel 6 and laravel 7, and laravel 8.
So, let's see the laravel 9 one to one relationship, laravel 9 eloquent relationships example.
We will create a User and Phone table. User
model might be associated with one Phone
model. To define this relationship, we will place a phone
method on the User
model. The phone
method should call the hasOne
method and return its result.
In this step, we have to create migration for users and phones table. we will also add a foreign key to the user's table.
Create Migration of Users Table
Schema::create('users', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('email')->unique();
$table->timestamps();
});
Create Migration of Phones Table with Foreign Key
Schema::create('phones', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned();
$table->string('phone_no');
$table->timestamps();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
});
In the user model, we can create a phone() function and add the relation of the phone model using hasOne method.
User Model:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
/**
* Get the phone associated with the user.
*/
public function phone()
{
return $this->hasOne(Phone::class);
}
}
Phone Model:
we can access the Phone
model from our User
model. Next, let's define a relationship on the Phone
model that will let us access the user that owns the phone. We can define the inverse of a hasOne
relationship using the belongsTo
method.
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Phone extends Model
{
/**
* Get the user that owns the phone.
*/
public function user()
{
return $this->belongsTo(User::class);
}
}
If the foreign key on the Phone
model is not user_id
, you may pass a custom key name as the second argument to the belongsTo
method.
public function user()
{
return $this->belongsTo(User::class, 'foreign_key');
}
Once the relationship is defined, you may retrieve the related record using Eloquent's dynamic properties. So, here we can use the User model with a phone function.
$phone = User::find(1)->phone;
$user = Phone::find(1)->user;
Now, we will add records to the phone table using the user model.
$user = User::find(1);
$phone = new Phone;
$phone->phone_no = '1234567890';
$user->phone()->save($phone);
$phone = Phone::find(1);
$user = User::find(1);
$phone->user()->associate($user)->save();
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