Task 6 - average of the field

README.md

@@ -67,3 +67,11 @@ Test method `test_teams_with_users()`.
 
 ---
 
+## Task 6. HasMany - Average from Field Value
+
+In the route `/countries`, the table should show the countries with average team size. Fix the Controller to load the relationship number, as it is expected in the Blade.
+
+Test method `test_countries_with_team_size()`.
+
+---
+

app/Http/Controllers/CountryController.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Country;
+
+class CountryController extends Controller
+{
+    public function index()
+    {
+        // TASK: load the relationship average of team size
+        $countries = Country::all();
+
+        return view('countries.index', compact('countries'));
+    }
+}

app/Models/Country.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Country extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['name'];
+
+    public function teams()
+    {
+        return $this->hasMany(Team::class);
+    }
+}

app/Models/Team.php

@@ -9,7 +9,7 @@ class Team extends Model
 {
     use HasFactory;
 
-    protected $fillable = ['name'];
+    protected $fillable = ['name', 'size'];
 
     public function users()
     {

database/migrations/2021_11_22_061400_create_countries_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateCountriesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('countries', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('countries');
+    }
+}

database/migrations/2021_11_22_061411_add_country_id_to_teams_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddCountryIdToTeamsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('teams', function (Blueprint $table) {
+            $table->foreignId('country_id')->nullable()->constrained();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('teams', function (Blueprint $table) {
+            //
+        });
+    }
+}

database/migrations/2021_11_22_061647_add_size_to_teams_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddSizeToTeamsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('teams', function (Blueprint $table) {
+            $table->integer('size')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('teams', function (Blueprint $table) {
+            //
+        });
+    }
+}

resources/views/countries/index.blade.php

@@ -0,0 +1,5 @@
+<ul>
+    @foreach ($countries as $country)
+        <li>{{ $country->name }} (avg team size {{ $country->teams_avg_size }})</li>
+    @endforeach
+</ul>

routes/web.php

@@ -26,3 +26,5 @@ Route::get('users/{user}', [\App\Http\Controllers\UserController::class, 'show']
 Route::get('roles', [\App\Http\Controllers\RoleController::class, 'index']);
 
 Route::get('teams', [\App\Http\Controllers\TeamController::class, 'index']);
+
+Route::get('countries', [\App\Http\Controllers\CountryController::class, 'index']);

tests/Feature/RelationshipsTest.php

@@ -3,6 +3,7 @@
 namespace Tests\Feature;
 
 use App\Models\Comment;
+use App\Models\Country;
 use App\Models\Role;
 use App\Models\Task;
 use App\Models\Team;
@@ -84,4 +85,23 @@ class RelationshipsTest extends TestCase
         $response->assertSee($createdAt);
         $response->assertSee($position);
     }
+
+    // TASK: average number from the relationship
+    public function test_countries_with_team_size()
+    {
+        $country = Country::create(['name' => 'United Kingdom']);
+        Team::create([
+            'name' => 'Team 1',
+            'country_id' => $country->id,
+            'size' => 3
+        ]);
+        Team::create([
+            'name' => 'Team 2',
+            'country_id' => $country->id,
+            'size' => 5
+        ]);
+
+        $response = $this->get('/countries');
+        $response->assertSee('avg team size 4');
+    }
 }