Getting array_push result from function

Question

in this below code i used array_push in the main function

$postsList = [];
foreach ($categories->posts as $post) {
    array_push($postsList, $post);
}

and after this operation i used this code:

$this->child($categories,$postsList);

child is a function which into that i used $postsList and my problem is i can't return latest value of that to main function

full code:

public function index()
{
    ...
    $postsList = [];
    foreach ($categories->posts as $post) {
        array_push($postsList, $post);
    }


    array_push($postsList, $this->child($categories, $postsList));
    dd($postsList);
}

private function child($categories,$postsList)
{
    if ($categories->childrenCategories->first()) {
        foreach ($categories->childrenCategories as $childCategory) {
            foreach ($childCategory->categories as $category) {
                foreach ($category->posts as $post) {
                    array_push($postsList,$post);
                }
            }

            foreach ($childCategory->posts as $post) {
                array_push($postsList,$post);
            }
            $this->child($childCategory,$postsList);
        }
    }
}

mighty_dev · Accepted Answer · 2020-12-09 08:01:20Z

You can manage them by sending the same copy of postsList using reference & like below in the function parameter.

private function child($categories,&$postsList)
{
    if ($categories->childrenCategories->first()) {
        foreach ($categories->childrenCategories as $childCategory) {
            foreach ($childCategory->categories as $category) {
                foreach ($category->posts as $post) {
                    array_push($postsList,$post);
                }
            }

            foreach ($childCategory->posts as $post) {
                array_push($postsList,$post);
            }
            $this->child($childCategory,$postsList);
        }
    }
}

In index() method, you don't need to array_push() again from the child() call, but rather just call the child() method.

public function index()
{
    ...
    $postsList = [];
    foreach ($categories->posts as $post) {
        array_push($postsList, $post);
    }


    $this->child($categories, $postsList);
    dd($postsList);
}

Donkarnash · Accepted Answer · 2020-12-09 20:54:23Z

1

From what I understand is that you are trying to pluck out the posts from categories nested under root categories.

Try the below


//Eager load all relations on the Category records

$categories = Category::with(['posts', 'childrenCategories.posts', 'childrenCategories.categories.posts'])->get();

public function getPosts($categories)
{
      //Get all Posts from the root level categories
      $postList = collect($categories->pluck('posts')->all());

      $categories->each(function($category) use(&$postList){

        if ($category->childrenCategories->count()) {

            $category->childrenCategories->each(function ($childCategroy) use (&$postList){
                //Get all Posts from child categories of root level categories
                $postList->push($childCategroy->posts);

                //Get all Posts from the categories of child category
                $postList->push($childCategroy->categories->pluck('posts')->all());
            });
        }

      });

      return $postList->unique('id')->all();
}

Then in the main function you can just call getPosts($categories)

public function main()
{
    $postList = $this->getPosts($categories);
}

Another way this could be accomplished it to make a query to get ids of all categories with nested categories. Then make a simple query to the posts table to get all posts where category_id is within the array.

edited Dec 9, 2020 at 20:54

answered Dec 9, 2020 at 8:35

Donkarnash

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9 Comments

DolDurma Over a year ago

posts and categories are ManyToMany and passed categories has posts in relations and $categories->pluck('posts') return Column not found: 1054 Unknown column 'posts' in 'field list' (SQL: select posts` from categories where categories.deleted_at is null)` error

Donkarnash Over a year ago

If you have eager loaded posts on categories then pluck should work. $categories = Category::with('posts')->get() then $categories->pluck('posts') should not give any errors like column not found, because then we are using pluck on a collection of categories with posts reation

DolDurma Over a year ago

@Donkarnashmy Query is : $categories = Category::with(['childrenCategories' => function ($query) {$query->with('posts');}, 'posts'])

Donkarnash Over a year ago

@DolDurma Have updated answer to show eager load all relations (sample code). Let me know if it works

DolDurma Over a year ago

i checked, this code which i used $categories = Category::with(['posts', 'childrenCategories.posts', 'childrenCategories.categories.posts'])->get(); return 233 row and when i try to dump it as dd($categories->childrenCategories); i get Property [childrenCategories] does not exist on this collection instance. error. in my model i have childrenCategories not childCategories

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