Episode 54

app/Http/Controllers/RepliesController.php

@@ -4,6 +4,7 @@
 
 use App\Reply;
 use App\Thread;
+use Illuminate\Support\Facades\Gate;
 
 class RepliesController extends Controller
 {
@@ -35,6 +36,12 @@ public function index($channelId, Thread $thread)
      */
     public function store($channelId, Thread $thread)
     {
+        if (Gate::denies('create', new Reply)) {
+            return response(
+                'You are posting too frequently. Please take a break. :)', 429
+            );
+        }
+
         try {
             $this->validate(request(), ['body' => 'required|spamfree']);
 

app/Policies/ReplyPolicy.php

@@ -21,4 +21,19 @@ public function update(User $user, Reply $reply)
     {
         return $reply->user_id == $user->id;
     }
+
+    /**
+     * Determine if the authenticated user has permission to create a new reply.
+     *
+     * @param  User $user
+     * @return bool
+     */
+    public function create(User $user)
+    {
+        if (! $lastReply = $user->fresh()->lastReply) {
+            return true;
+        }
+
+        return ! $lastReply->wasJustPublished();
+    }
 }

app/Reply.php

@@ -2,6 +2,7 @@
 
 namespace App;
 
+use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
 
 class Reply extends Model
@@ -65,6 +66,16 @@ public function thread()
         return $this->belongsTo(Thread::class);
     }
 
+    /**
+     * Determine if the reply was just published a moment ago.
+     *
+     * @return bool
+     */
+    public function wasJustPublished()
+    {
+        return $this->created_at->gt(Carbon::now()->subMinute());
+    }
+
     /**
      * Determine the path to the reply.
      *

app/User.php

@@ -48,9 +48,19 @@ public function threads()
         return $this->hasMany(Thread::class)->latest();
     }
 
+    /**
+     * Fetch the last published reply for the user.
+     *
+     * @return \Illuminate\Database\Eloquent\Relations\HasOne
+     */
+    public function lastReply()
+    {
+        return $this->hasOne(Reply::class)->latest();
+    }
+
     /**
      * Get all activity for the user.
-     * 
+     *
      * @return \Illuminate\Database\Eloquent\Relations\HasMany
      */
     public function activity()

tests/Feature/ParticipateInThreadsTest.php

@@ -109,8 +109,22 @@ function replies_that_contain_spam_may_not_be_created()
             'body' => 'Yahoo Customer Support'
         ]);
 
-        $this->expectException(\Exception::class);
+        $this->post($thread->path() . '/replies', $reply->toArray())
+            ->assertStatus(422);
+    }
 
-        $this->post($thread->path() . '/replies', $reply->toArray());
+    /** @test */
+    function users_may_only_reply_a_maximum_of_once_per_minute()
+    {
+        $this->signIn();
+
+        $thread = create('App\Thread');
+        $reply = make('App\Reply');
+
+        $this->post($thread->path() . '/replies', $reply->toArray())
+            ->assertStatus(200);
+
+        $this->post($thread->path() . '/replies', $reply->toArray())
+            ->assertStatus(429);
     }
 }

tests/Unit/ReplyTest.php

@@ -2,6 +2,7 @@
 
 namespace Tests\Unit;
 
+use Carbon\Carbon;
 use Illuminate\Foundation\Testing\DatabaseMigrations;
 use Tests\TestCase;
 
@@ -16,4 +17,16 @@ function it_has_an_owner()
 
         $this->assertInstanceOf('App\User', $reply->owner);
     }
+
+    /** @test */
+    function it_knows_if_it_was_just_published()
+    {
+        $reply = create('App\Reply');
+
+        $this->assertTrue($reply->wasJustPublished());
+
+        $reply->created_at = Carbon::now()->subMonth();
+
+        $this->assertFalse($reply->wasJustPublished());
+    }
 }

tests/Unit/UserTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+use Illuminate\Foundation\Testing\DatabaseMigrations;
+
+class UserTest extends TestCase
+{
+    use DatabaseMigrations;
+
+    /** @test */
+    public function a_user_can_fetch_their_most_recent_reply()
+    {
+        $user = create('App\User');
+
+        $reply = create('App\Reply', ['user_id' => $user->id]);
+
+        $this->assertEquals($reply->id, $user->lastReply->id);
+    }
+}