add relation tests

tests/App/Migrations/0001_01_01_000000_create_test_tables.php

@@ -2,6 +2,7 @@
 
 use Abbasudo\Purity\Tests\App\Models\Author;
 use Abbasudo\Purity\Tests\App\Models\Post;
+use Abbasudo\Purity\Tests\App\Models\Product;
 use Abbasudo\Purity\Tests\App\Models\Tag;
 use Abbasudo\Purity\Tests\App\Models\User;
 use Illuminate\Database\Migrations\Migration;
@@ -31,6 +32,7 @@ public function up(): void
             $table->id();
             $table->foreignIdFor(User::class)->nullable();
             $table->string('title')->nullable();
+            $table->nullableMorphs('postable');
             $table->timestamps();
         });
 
@@ -60,6 +62,7 @@ public function up(): void
             $table->foreignIdFor(Author::class)->nullable();
             $table->string('name');
             $table->string('description');
+            $table->foreignIdFor(Product::class)->nullable();
             $table->timestamps();
         });
 

tests/App/Models/Book.php

@@ -6,6 +6,7 @@
 use Abbasudo\Purity\Traits\Sortable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
 
 class Book extends Model
 {
@@ -26,4 +27,9 @@ public function author(): BelongsTo
     {
         return $this->belongsTo(Author::class);
     }
+
+    public function posts(): MorphMany
+    {
+        return $this->morphMany(Post::class, 'postable');
+    }
 }

tests/App/Models/Post.php

@@ -9,6 +9,7 @@
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
 
 class Post extends Model
 {
@@ -18,6 +19,7 @@ class Post extends Model
 
     protected $fillable = [
         'title',
+        'user_id'
     ];
 
     public function comments(): HasMany
@@ -34,4 +36,9 @@ public function tags(): BelongsToMany
     {
         return $this->belongsToMany(Tag::class);
     }
+
+    public function postable(): MorphTo
+    {
+        return $this->morphTo();
+    }
 }

tests/App/Models/Product.php

@@ -7,6 +7,8 @@
 use Abbasudo\Purity\Traits\Sortable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
 
 class Product extends Model
 {
@@ -26,4 +28,14 @@ protected static function newFactory()
         'description',
         'is_available',
     ];
+
+    public function posts(): MorphMany
+    {
+        return $this->morphMany(Post::class, 'postable');
+    }
+
+    public function book(): HasOne
+    {
+        return $this->hasOne(Book::class);
+    }
 }

tests/Feature/FilterableTest.php

@@ -409,7 +409,7 @@ public function it_can_filter_with_and_operator(): void
         ]);
 
         $response = $this->getJson(
-            '/posts?filters[$and][0][name][$eq]=laravel purity is the best&filters[$and][1][description][$eq]=laravel purity is the best'
+            '/products?filters[$and][0][name][$eq]=laravel purity&filters[$and][1][description][$eq]=laravel purity is the best'
         )
             ->assertOk()
             ->assertJsonCount(1);

tests/Feature/RelationFilterTest.php

@@ -0,0 +1,98 @@
+<?php
+
+use Abbasudo\Purity\Tests\App\Models\Book;
+use Abbasudo\Purity\Tests\App\Models\Post;
+use Abbasudo\Purity\Tests\App\Models\Product;
+use Abbasudo\Purity\Tests\App\Models\User;
+use Abbasudo\Purity\Tests\TestCase;
+use Illuminate\Support\Facades\Route;
+
+class RelationFilterTest extends TestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        Route::get('/posts', function () {
+            return Post::filter()->get();
+        });
+
+        Route::get('/products', function () {
+            return Product::filter()->get();
+        });
+
+        Post::create([
+            'title' => 'laravel purity is the best',
+        ]);
+    }
+
+    /** @test */
+    public function it_can_filter_by_has_many_relation(): void
+    {
+        $post = Post::first();
+
+        $post->comments()->create([
+            'content' => 'first comment',
+        ]);
+
+        $post->comments()->create([
+            'content' => 'second comment',
+        ]);
+
+        $response = $this->getJson('/posts?filters[comments][content][$eq]=first comment');
+
+        $response->assertOk();
+        $response->assertJsonCount(1);
+    }
+
+    /** @test */
+    public function it_can_filter_by_belongs_to_relation(): void
+    {
+        $user = User::create([
+            'name' => 'Test',
+        ]);
+
+        $post = Post::create([
+            'title'   => 'laravel purity is the best',
+            'user_id' => $user->id,
+        ]);
+
+        $response = $this->getJson('/posts?filters[user][name][$eq]=Test');
+
+        $response->assertOk();
+        $response->assertJsonCount(1);
+    }
+
+    /** @test */
+    public function it_can_filter_by_belongs_to_many_relation(): void
+    {
+        $post = Post::first();
+
+        $post->tags()->create([
+            'name' => 'Laravel',
+        ]);
+
+        $response = $this->getJson('/posts?filters[tags][name][$eq]=Laravel');
+
+        $response->assertOk();
+        $response->assertJsonCount(1);
+    }
+
+    /** @test */
+    public function it_can_filter_by_has_one_relation(): void
+    {
+        $product = Product::factory([
+            'name' => 'Laravel Purity',
+        ])->create();
+
+        $product->book()->create([
+            'name'        => 'book',
+            'description' => 'book for product'
+        ]);
+
+        $response = $this->getJson('/products?filters[book][name][$eq]=book');
+
+        $response->assertOk();
+        $response->assertJsonCount(1);
+    }
+}