Extends base.twig when it is with passed entity - templates

Question

I am making some small project with Symfony, but now I have a question about base.twig.html, and does it should be passed with some entity in it. I am using Symfony 4.
Lets say I have some entity MainCategory with:
id
name
info
slug
Then from my Route /, I use MainCategoryRepository to get all records for that entity, then render the base.twig with the passed records.
Then in navigation bar, I loop over all records and make links with the entity.name.
After that in another Route "/{slug}", i render another twig file which extends the base one. But here i am not using the repository, i use just the Entity - MainCategory, because the 'slug' is unique field and it will get only that record.
And here is the problem, i am just passing one record, but the navigation bar from the 'base.twig' loop over all records and here I get an error:
Variable "mainCategories" does not exist.
Here is my code:
Route "/"
/**
* #Route("/", name="app_homepage")
*/
public function homepage(MainCategoryRepository $mainCategoryRepository)
{
$mainCategories = $mainCategoryRepository->findAll();
return $this->render('base.html.twig', [
'mainCategories' => $mainCategories,
]);
}
"base.html.twig"
{% for mainCategory in mainCategories %}
<li>
<a href="{{ path('category_show', {'slug': mainCategory.slug}) }}">
{{ mainCategory.name }}</a>
</li>
{% endfor %}
Route "/{slug}"
/**
* #Route("/{slug}", name="category_show")
*/
public function categoryShow(MainCategory $mainCategory)
{
return $this->render('show.html.twig',
[
'mainCategory' => $mainCategory,
]
);
}
"show.html.twig"
{% extends 'base.html.twig' %}
{% block body %}
<p>{{ mainCategory.Info }}</p>
{% endblock %}
ERROR:
Variable "mainCategories" does not exist.
So it is good idea to pass any entity in base.twig? I can pass all records in the second twig file, but that means I have to do it in every template which extends the base.twig.

Answer 1

I found one solution, dont know is it perfect or the right solution, but it works.
I made one Service with a method in which I return all records from MainCategory Entity.
MainCategoryLoaderService
protected $mainCategoryRepository;
public function __construct(MainCategoryRepository $mainCategoryRepository)
{
$this->mainCategoryRepository = $mainCategoryRepository;
}
public function getAllMainCategories()
{
return $this->mainCategoryRepository->findAll();
}
Then in the file config/packages/twig.yaml I made one global variable:
Global Variable
globals:
globalMainCategory: '#App\Service\MainCategoryLoaderService'
After that in base.html.twig I made one variable in which I will have all main categories:
Twig Variable
{% set mainCategories = globalMainCategory.getAllMainCategories() %}
And then just loop over that variable.