Really rough fulltext driver implementation

migrations/2015_02_24_000000_create_posts_table.php

@@ -2,6 +2,7 @@
 
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Migrations\Migration;
+use DB;
 
 class CreatePostsTable extends Migration
 {
@@ -14,7 +15,6 @@ class CreatePostsTable extends Migration
     public function up()
     {
         Schema::create('posts', function (Blueprint $table) {
-        
             $table->increments('id');
             $table->integer('discussion_id')->unsigned();
             $table->integer('number')->unsigned()->nullable();
@@ -29,10 +29,11 @@ class CreatePostsTable extends Migration
             $table->integer('edit_user_id')->unsigned()->nullable();
             $table->dateTime('hide_time')->nullable();
             $table->integer('hide_user_id')->unsigned()->nullable();
+
+            $table->unique(['discussion_id', 'number']);
         });
 
-        // add fulltext index to content (and title?)
-        // add unique index on [discussion_id, number] !!!
+        DB::statement('ALTER TABLE posts ADD FULLTEXT content (content)');
     }
 
     /**

src/Core/CoreServiceProvider.php

@@ -89,6 +89,11 @@ class CoreServiceProvider extends ServiceProvider
             'Flarum\Core\Repositories\EloquentActivityRepository'
         );
 
+        $this->app->bind(
+            'Flarum\Core\Search\Discussions\Fulltext\DriverInterface',
+            'Flarum\Core\Search\Discussions\Fulltext\MySqlFulltextDriver'
+        );
+
         $avatarFilesystem = function (Container $app) {
             return $app->make('Illuminate\Contracts\Filesystem\Factory')->disk('flarum-avatars')->getDriver();
         };

src/Core/Repositories/EloquentPostRepository.php

@@ -3,9 +3,17 @@
 use Illuminate\Database\Eloquent\Builder;
 use Flarum\Core\Models\Post;
 use Flarum\Core\Models\User;
+use Flarum\Core\Search\Discussions\Fulltext\DriverInterface;
 
 class EloquentPostRepository implements PostRepositoryInterface
 {
+    protected $fulltext;
+
+    public function __construct(DriverInterface $fulltext)
+    {
+        $this->fulltext = $fulltext;
+    }
+
     /**
      * Find a post by ID, optionally making sure it is visible to a certain
      * user, or throw an exception.
@@ -72,10 +80,13 @@ class EloquentPostRepository implements PostRepositoryInterface
      */
     public function findByContent($string, User $user = null)
     {
-        $query = Post::select('id', 'discussion_id')
-            ->where('content', 'like', '%'.$string.'%');
-            // ->whereRaw('MATCH (`content`) AGAINST (? IN BOOLEAN MODE)', [$string])
-            // ->orderByRaw('MATCH (`content`) AGAINST (?) DESC', [$string])
+        $ids = $this->fulltext->match($string);
+
+        $query = Post::select('id', 'discussion_id')->whereIn('id', $ids);
+
+        foreach ($ids as $id) {
+            $query->orderByRaw('id != ?', [$id]);
+        }
 
         return $this->scopeVisibleForUser($query, $user)->get();
     }

src/Core/Search/Discussions/Fulltext/DriverInterface.php

@@ -0,0 +1,6 @@
+<?php namespace Flarum\Core\Search\Discussions\Fulltext;
+
+interface DriverInterface
+{
+    public function match($string);
+}

src/Core/Search/Discussions/Fulltext/MySqlFulltextDriver.php

@@ -0,0 +1,13 @@
+<?php namespace Flarum\Core\Search\Discussions\Fulltext;
+
+use Flarum\Core\Models\Post;
+
+class MySqlFulltextDriver implements DriverInterface
+{
+    public function match($string)
+    {
+        return Post::whereRaw('MATCH (`content`) AGAINST (? IN BOOLEAN MODE)', [$string])
+            ->orderByRaw('MATCH (`content`) AGAINST (?) DESC', [$string])
+            ->lists('id');
+    }
+}