Retrieve data by foreign key - mysql

Question

I have two tables in my database Users and Complains.
Users table :
id | name | password
Complains table
id | user_id | title | body
The user_id is a foreign key. How do I retrieve title and body from the complains table based on the user_id?
This is what I have so far but I cannot retrieve data specific to the user_id
My User Model :
<?php
namespace App;
use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
class User extends Authenticatable
{
use Notifiable;
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'name', 'surname', 'regnumber', 'course', 'department', 'email', 'password',
];
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'password', 'remember_token',
];
}
My Profile Controller :
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\User;
use App\Complain;
use App\Feedback;
use App\Item;
use Illuminate\Support\Facades\Redirect;
use Session;
use Auth;
class ProfileController extends Controller
{
public function profile($user_id){
$user = User::whereId($user_id)->first();
$complains = Complain::paginate(2);
return view('user.profile', compact('user', 'complains'));
}
}
My view:
#foreach($complains as $complain)
<div>
<h3 class="operator-complain-title">Title: </h3>
<p>{{ $complain->title }}</p>
<h3 class="operator-complain-title">Complain:</h3>
<p>{{ $complain->body }}</p>
</div>
<hr>
#endforeach
Anyone with any ideas please share.

Answer 1

You'll want to setup a one-to-many relationship as outlined here: https://laravel.com/docs/5.4/eloquent-relationships#one-to-many
Once you have the correct methods in place, Eloquent will find relations when you do something like $user->complains.
class User extends Model
{
/**
* Get the complains for the User.
*/
public function complains()
{
return $this->hasMany('App\Complain');
}
}
class Complain extends Model
{
/**
* Get the User for the Complain.
*/
public function user()
{
return $this->belongsTo('App\User');
}
}

Answer 2

This is my users table migration :
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateUsersTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('users', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('email')->unique();
$table->string('password');
$table->rememberToken();
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('users');
}
}
This is my complains table migration :
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateComplainsTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('complains', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->text('body');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('complains');
}
}
This is the migration I used to add foreign key to complains table:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class AddForeignKeyToComplains extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::table('complains', function (Blueprint $table) {
$table->integer('user_id')->after('id')->nullable();
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::table('complains', function (Blueprint $table) {
$table->dropColumn('user_id');
});
}
}