Laravel how to add pagination on categorized posts - php

Question

I have an laravel-application where I want to add pagination to my "blog-posts"-section. I can make it work when I return all blog_posts, but since they are categorized, the pagination does not work anymore.
Here is my controller
public function index() {
$blog_posts = Blog::where("publishes_on", "<=", Carbon::now())
->orderBy('publishes_on', 'desc')
->where('blog_status_id', '=', '2')
->with('blog_category')
->paginate(4);
$blog_categories = BlogCategory::get();
return view('blog.index', compact('blog_categories', 'blog_posts'));
}
and the blade view
#foreach($blog_categories as $category)
#foreach($category->blog_posts as $blog)
<div>
{{ $blog->title }}
</div>
#endforeach
#endforeach
Before I added the categories, my blade view looked like this
#foreach($blog_posts as $blog)
<div style="border-top: 2px solid red; padding: 4px;">
{{ $blog->title }}
</div>
#endforeach
<div>
{{ $blog_posts->links() }}
</div>
but now, I don't know how to add the pagination?
can someone help me out

Answer 1

You can use setRelation to override blog_posts relationship and have it return a paginated collection instead:
<?php
$blog_categories = BlogCategory::get()
->map(function($blogCategory) {
return $blogCategory
->setRelation( 'blog_posts', $blogCategory->blog_posts()->paginate(10) );
});
Calling paginate() returns an instance of Illuminate\Pagination\LengthAwarePaginator
To get collection of blog posts, use this:
$category->blog_posts->getCollection()
To get pagination links view:
$category->blog_posts->links()
It's all untested, so let me know if it doesn't work

Answer 2

You can create your custom pagination: (https://laravel.com/api/5.8/Illuminate/Pagination/LengthAwarePaginator.html)
$all_posts = Blog::where("publishes_on", "<=", Carbon::now())
->orderBy('publishes_on', 'desc')
->where('blog_status_id', '=', '2')
->with('blog_category')
->get();
$blog_categories = BlogCategory::get();
$count = count($all_posts);
$page = (request('page'))?:1;
$rpp = 4; //(request('perPage'))?:10;
$offset = $rpp * ($page - 1);
$paginator = new LengthAwarePaginator(
$all_posts->slice($offset,$rpp),$count,$rpp,$page,[
'path' => request()->url(),
'query' => request()->query(),
]);
$blog_posts = $paginator;
return view('blog.index', ['blog_posts' => $blog_posts,
'blog_categories' => $blog_categories]);