How are your routes structured? If you use a resource route the comment would be a nested route like this:

Route::resource('article.comment', ...)

That way all the comment methods would get an additional parameter article_id (since the routes would look like this: /article/15/comment with 15 being the article id).

If you don't have a resource controller you could either add an article_id to your URL (and then change the action attribute of the form) or add a hidden input article_id to the form.

My routes look like this:

Route::resource('articles', 'articleController');
Route::resource('comments', 'commentController');

I have a few questions:

1. Is it a good practice to use a hidden form to add something to $request. It could be rewritten, right?
2. Since I use my routes, aritcle's URL looks like '/articles/2'. Is it possible to use url facade to get previous URL and get an article id from the string? But there is still a problem with that. I can use human readable URL and there will be no id...
3. About 'article.comment' in routes. In this situation to show all the articles, my URL should be like this: '/article/{article}/comment' where {article} is an id. But I want to show all the articles. Why do I need to put an id into URL?

Oh, now I get it! But still have a problem :)

I can't find 'aricle_id' variable( I changed url in form to 'article/15/comment'). Should it be in $request?

I figured out :)

Need to do this in store method:

public function store(Request $request, $articleId)
    {
        ...
    }

Thank you for help!