Scope to filter unliked content (#15)

* Adding filter for unliked models.

readme.md

@@ -107,6 +107,8 @@ $user->follows($friend); // alias
 
 ### Filtering followed/unfollowed models
 You can filter your queries using scopes provided by this package to filter followed models, if you plan, for example, to create a news feed, or if your user wants to find new people, you can filter the unfollowed models.
+Make sure your model uses the `Rennokki\Befriended\Scopes\CanFilterFollowingModels` trait for filtering following models and/or `Rennokki\Befriended\Scopes\CanFilterUnfollowedModels` for filtering unfollowed models.
+
 ```php
 $bob = User::where('username', 'john')->first();
 $alice = User::where('username', 'alice')->first();
@@ -171,6 +173,8 @@ $user->blocks($page); // alias to isBlocking
 
 ### Filtering blocked models
 Blocking scopes provided takes away from the query the models that are blocked. Useful to stop showing content when someone blocks people.
+Make sure your model uses the `Rennokki\Befriended\Scopes\CanFilterBlockedModels` trait.
+
 ```php
 $bob = User::where('username', 'john')->first();
 $alice = User::where('username', 'alice')->first();
@@ -229,3 +233,18 @@ $user->likers(Page::class); // Pages that like this user.
 $user->isLiking($page);
 $user->likes($page); // alias to isLiking
 ```
+
+### Filtering liked content
+Filtering liked content can make showing content easier. For example, showing in the news feed posts that weren't liked by an user can be helpful.
+The model you're querying from must use the `Rennokki\Befriended\Scopes\CanFilterUnlikedModels` trait.
+
+Let's suppose there are 10 pages in the database.
+```php
+$bob = User::where('username', 'john')->first();
+$page = Page::find(1);
+
+Page::filterUnlikedFor($bob)->get(); // You will get 10 results.
+
+$bob->like($page);
+Page::filterUnlikedFor($bob)->get(); // You will get only 9 results.
+```

src/Scopes/CanFilterUnlikedModels.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Rennokki\Befriended\Scopes;
+
+trait CanFilterUnlikedModels
+{
+    public function scopeFilterUnlikedFor($query, $model)
+    {
+        $likedIds = collect($model->liking($this->getMorphClass())->get()->toArray())->pluck($model->getKeyName())->all();
+
+        return $query->whereNotIn($this->getKeyName(), $likedIds);
+    }
+}

tests/CanFilterLikingTest.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Rennokki\Befriended\Test;
+
+use Rennokki\Befriended\Test\Models\Page;
+
+class CanFilterLikingTest extends TestCase
+{
+    protected $user;
+    protected $user2;
+    protected $user3;
+    protected $page;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->user = factory(\Rennokki\Befriended\Test\Models\User::class)->create();
+        $this->user2 = factory(\Rennokki\Befriended\Test\Models\User::class)->create();
+
+        factory(\Rennokki\Befriended\Test\Models\Page::class, 10)->create();
+    }
+
+    public function testCanFilterNonLikes()
+    {
+        $this->assertEquals(Page::filterUnlikedFor($this->user)->count(), 10);
+        $this->assertEquals(Page::filterUnlikedFor($this->user2)->count(), 10);
+
+        $this->user->like(Page::find(1));
+        $this->user->like(Page::find(2));
+
+        $this->assertEquals(Page::filterUnlikedFor($this->user)->count(), 8);
+        $this->assertEquals(Page::filterUnlikedFor($this->user2)->count(), 10);
+    }
+}

tests/Models/Page.php

@@ -13,13 +13,14 @@
 use Rennokki\Befriended\Traits\CanBeBlocked;
 use Rennokki\Befriended\Traits\CanBeFollowed;
 use Rennokki\Befriended\Scopes\CanFilterBlockedModels;
+use Rennokki\Befriended\Scopes\CanFilterUnlikedModels;
 use Rennokki\Befriended\Scopes\CanFilterFollowingModels;
 use Rennokki\Befriended\Scopes\CanFilterUnfollowedModels;
 
 class Page extends Model implements Following, Blocking, Liking
 {
     use CanFollow, CanBeFollowed, CanBlock, CanBeBlocked, CanLike, CanBeLiked, CanFilterFollowingModels, CanFilterBlockedModels,
-        CanFilterUnfollowedModels;
+        CanFilterUnfollowedModels, CanFilterUnlikedModels;
 
     protected $fillable = [
         'name',

tests/Models/User.php

@@ -12,14 +12,15 @@
 use Rennokki\Befriended\Traits\CanBeBlocked;
 use Rennokki\Befriended\Traits\CanBeFollowed;
 use Rennokki\Befriended\Scopes\CanFilterBlockedModels;
+use Rennokki\Befriended\Scopes\CanFilterUnlikedModels;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Rennokki\Befriended\Scopes\CanFilterFollowingModels;
 use Rennokki\Befriended\Scopes\CanFilterUnfollowedModels;
 
 class User extends Authenticatable implements Following, Blocking, Liking
 {
     use CanFollow, CanBeFollowed, CanBlock, CanBeBlocked, CanLike, CanBeLiked, CanFilterFollowingModels, CanFilterBlockedModels,
-        CanFilterUnfollowedModels;
+        CanFilterUnfollowedModels, CanFilterUnlikedModels;
 
     protected $fillable = [
         'name', 'email', 'password',