Laravel 5 how to get many random rows using collections - php

Question

Based on how get random row laravel-5 I adjusted my query, but still not receiving the expected result.
I have 20 articles in the database and want to get randomly only 3 of them and show them on the page.
My class is just like the following:
public function article()
{
$article = DashArticle::where('category', '=', 0)->get()->random(3);
$articleTitle0 = $article[0]->titel;
$articleAutor0 = $article[0]->autor;
$articleAbstract0 = $article[0]->abstract;
$articleSource0 = $article[0]->source;
$articleTitle1 = $article[1]->titel;
$articleAutor1 = $article[1]->autor;
$articleAbstract1 = $article[1]->abstract;
$articleSource1 = $article[1]->source;
$articleTitle2 = $article[2]->titel;
$articleAutor2 = $article[2]->autor;
$articleAbstract2 = $article[2]->abstract;
$articleSource2 = $article[2]->source;
return compact(
'articleTitle0', 'articleAutor0', 'articleAbstract0', 'articleSource0',
'articleTitle1', 'articleAutor1', 'articleAbstract1', 'articleSource1',
'articleTitle2', 'articleAutor2', 'articleAbstract2', 'articleSource2'
);
}
And here part of the view:
<div id="a-slide" class="carousel slide auto panel-body">
<ol class="carousel-indicators out">
<li class="active" data-slide-to="0" data-target="#a-slide"></li>
<li class="" data-slide-to="1" data-target="#a-slide"></li>
<li class="" data-slide-to="2" data-target="#a-slide"></li>
</ol>
<div class="carousel-inner">
<div class="item active" style="padding: 0 16px;">
<p style="font-size: 16px; font-weight: bold;">{!! $articleTitle0 !!}</p>
<p class="text-muted">{!! $articleAutor0 !!}</p>
<p><strong>Abstract:</strong><br />{!! $articleAbstract0 !!}</p>
<p>
<a href="$articleSource !!}" target="_blank">
{!! $articleSource0 !!}
</a>
</p>
</div>
<div class="item" style="padding: 0 16px;">
<p style="font-size: 16px; font-weight: bold;">{!! $articleTitle1 !!}</p>
<p class="text-muted">{!! $articleAutor1 !!}</p>
<p><strong>Abstract:</strong><br />{!! $articleAbstract1 !!}</p>
<p>
<a href="{!! $articleSource1 !!}" target="_blank">
{!! $articleSource1 !!}
</a>
</p>
</div>
The problem is when I let the random = 3
($article = DashArticle::where('category', '=', 0)->get()->random(3);
I get following error: "Undefined offset: 1"
and when I user random = 20 (the total number of rows in the table) it works but I don't become any random articles but always the first 3 lines of the table.
I would appreciate any help! Thanks!

Answer 1

The problem is that random method preserves keys from original collection. To avoid this you should get a pure values:
$article = DashArticle::where('category', '=', 0)->get()->random(3)->values();

Answer 2

You can get random rows by like this :
public function article()
{
$article = DashArticle::orderBy(DB::raw('RAND()'))->take(3)->get();
//pass data to view
if(view()->exists('article.list')){
return view('article.list',compact('article'));
}
}

Answer 3

Try this
$article = DashArticle::where('category', '=', 0)->get()->shuffle()->all();