pixelfed/app/Http/Controllers/HashtagFollowController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Auth;
use App\{
	Hashtag,
	HashtagFollow,
	Status
};

class HashtagFollowController extends Controller
{
    public function __construct()
    {
    	$this->middleware('auth');
    }

    public function store(Request $request)
    {
    	$this->validate($request, [
    		'name' => 'required|alpha_num|min:1|max:124|exists:hashtags,name'
    	]);

    	$user = Auth::user();
    	$profile = $user->profile;
    	$tag = $request->input('name');

    	$hashtag = Hashtag::whereName($tag)->firstOrFail();

        $hashtagFollow = HashtagFollow::firstOrCreate([
            'user_id' => $user->id,
            'profile_id' => $user->profile_id ?? $user->profile->id,
            'hashtag_id' => $hashtag->id
        ]);

        if($hashtagFollow->wasRecentlyCreated) {
            $state = 'created';
            // todo: send to HashtagFollowService
        } else {
            $state = 'deleted';
            $hashtagFollow->delete();
        }

        return [
            'state' => $state
        ];
    }
}