Laravel 9 Has One Through Eloquent Relationship Tutorial

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Laravel eloquent relationship is a very important feature which connects one or more tables in a chain. This is the substitute of joins in laravel.

Laravel provides these following relationships –

Eloquent relationships are defined as methods on your Eloquent model classes. Inside this article we will see the concept of laravel 9 Has One through Eloquent relationship.

This article will give you the detailed concept of about implementation of Has One through relationship in laravel.

For this tutorial we will consider a people table, brokers table and homes table. This means a person will contact a broker to take a home

Person -> Broker -> Home

Learn More –

Let’s get started.

Laravel Installation

Open terminal and run this command to create a laravel project.

$ composer create-project laravel/laravel myblog

It will create a project folder with name myblog inside your local system.

To start the development server of laravel –

$ php artisan serve

URL: http://127.0.0.1:8000

Assuming laravel already installed inside your system.

Create Database & Connect

To create a database, either we can create via Manual tool of PhpMyadmin or by means of a mysql command.

CREATE DATABASE laravel_app;

To connect database with application, Open .env file from application root. Search for DB_ and update your details.

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=laravel_app
DB_USERNAME=root
DB_PASSWORD=root

Create Migrations

We need few migration files –

  • People migration to store people data
  • Broker migration to store brokers
  • Home Migration to store homes data

Open project into terminal and run these artisan commands.

$ php artisan make:migration create_people_table

$ php artisan make:migration create_brokers_table

$ php artisan make:migration create_homes_table

It will create two migration files 2022_04_03_162204_create_people_table.php, 2022_04_03_162246_create_brokers_table.php, and 2022_04_03_162253_create_homes_table.php at location /database/migrations.

Open xxx_create_people_table.php and write this complete code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('people', function (Blueprint $table) {
            $table->id();
            $table->string("name", 120);
            $table->string("email", 120)->unique();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('people');
    }
};

Open xxx_create_brokers_table.php and write this code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('brokers', function (Blueprint $table) {
            $table->id();
            $table->string("name", 120);
            $table->string("email", 120)->unique();
            $table->foreignId('person_id')->constrained('people');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('brokers');
    }
};

Open xxx_create_homes_table.php and write this complete code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('homes', function (Blueprint $table) {
            $table->id();
            $table->string("title", 155);
            $table->text("location");
            $table->foreignId('broker_id')->constrained('brokers');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('homes');
    }
};

Run Migrations

Next, we need to migrate migrations.

$ php artisan migrate

This command will create tables inside database.

Create Model

Next, we need to create three models. Back to terminal and run these artisan commands.

$ php artisan make:model Person

$ php artisan make:model Broker

$ php artisan make:model Home

These commands will create three files Person.php, Broker.php & Home.php inside /app/Models folder.

Open Person.php and write this complete code into it.

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use App\Models\Home;
use App\Models\Broker;

class Person extends Model
{
    use HasFactory;

    public function homeInformation()
    {
        return $this->hasOneThrough(Home::class, Broker::class);
    }
}

$this->hasOneThrough(Home::class, Broker::class); This line is implementing the relationship i.e Has One Through.

Rest for all models like for Broker.php and Home.php code will be same as default code.

Sample Data Insertion

Open mysql and run these queries to insert dummy data into people, brokers and homes table.

Data for People Table

--
-- Dumping data for table `people`
--

INSERT INTO `people` (`id`, `name`, `email`, `created_at`, `updated_at`) VALUES
(1, 'Sanjay Kumar', 'sanjay@gmail.com', NULL, NULL),
(2, 'Ashish Kumar', 'ashish@gmail.com', NULL, NULL);

Data for Brokers Table

--
-- Dumping data for table `brokers`
--

INSERT INTO `brokers` (`id`, `name`, `email`, `person_id`, `created_at`, `updated_at`) VALUES
(1, 'Broker 1', 'broker1@gmail.com', 1, NULL, NULL),
(2, 'Broker 2', 'broker2@gmail.com', 2, NULL, NULL);

Data for Homes Table

--
-- Dumping data for table `homes`
--

INSERT INTO `homes` (`id`, `title`, `location`, `broker_id`, `created_at`, `updated_at`) VALUES
(1, 'Home 1', 'Location 1, Street 1, Sample', 2, NULL, NULL),
(2, 'Home 2', 'Location 2, Street 2, Sample ', 1, NULL, NULL);

Controller Usage

Open any controller say DataController.php file from /app/Http/Controllers folder.

Here, we have created a method in which we used model method as a property.

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Person;

class DataController extends Controller
{
    // To get home detail of a person
    public function getHome($person_id)
    {
        return Person::find($person_id)->homeInformation;
    }
}
  • Person::find($person_id)->homeInformation; It returns the home information by person_id through broker. Broker is attached with a home detail. It is showing has one through relationship.

Create Routes

Open web.php from /routes folder and add these routes into it.

//...

use App\Http\Controllers\DataController;

Route::get('home-info/{id}', [DataController::class, 'getHome']);

//...

Application Testing

Open project to terminal and type the command to start development server

$ php artisan serve

URL

Get Home Information by person id – http://127.0.0.1:8000/home-info/1

We hope this article helped you to learn Laravel 9 Has One Through Eloquent Relationship Tutorial in a very detailed way.

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