Add Sub Category - Laravel 5.2 - php

Question

I need to insert sub categories into my main categories. I have already done all the work for Showing, Adding, Editing, and Deleting parent Categories. But now im stuck with how to actually add a sub category to one of my parents category.
Here is how the table looks like for the category's and sub categories.
As you can see I already Have a sub category under iPhone's, which I added manually through the database. To add a sub category to a main category, I just click on the + sub-Category link which takes me to the form to add sub category.
Here i my route to show and add a sub category:
Route::group(["middleware" => 'admin'], function(){
/** More category routes here -->, just hidden for shortness **/
/** Show the Admin Add Sub-Categories Page **/
Route::get('admin/categories/addsub/{id}', [
'uses' => '\App\Http\Controllers\CategoriesController#addSubCategories',
'as' => 'admin.category.addsub',
'middleware' => ['auth'],
]);
/** Post the Sub-Category Route **/
Route::post('admin/categories/postsub/{id}', [
'uses' => '\App\Http\Controllers\CategoriesController#addPostSubCategories',
'as' => 'admin.category.postsub',
'middleware' => ['auth'],
]);
});
Here is my CategoriesController.php:
It is shortened just to show sub-categories functions. This is where I'm having trouble adding a sub category to a parent category
class CategoriesController extends Controller
/**
* Return the view for add new sub category
*
* #return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
*/
public function addSubCategories($id) {
$category = Category::findOrFail($id);
return view('admin.category.addsub', compact('category'));
}
/**
* #param $id
* #param CategoryRequest $request
* #return \Illuminate\Http\RedirectResponse
*/
public function addPostSubCategories($id, CategoryRequest $request) {
// Find the Parent Category ID
$category = Category::findOrFail($id);
// Insert into categories where the Parent_id = to the category ID
$categories = Category::where('parent_id', '=', $category);
// Assign $category to the Category Model, and request all validation rules
$categories = new Category($request->all());
// Then save the newly created category in DB
$categories->save();
// Flash a success message
flash()->success('Success', 'Sub Category added successfully!');
// Redirect back to Show all categories page.
return redirect()->route('admin.category.show');
}
}
My Category.php Model:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Category extends Model
{
protected $table = 'categories';
protected $fillable = ['name'];
protected $guarded = ['id'];
public function parent() {
return $this->belongsTo('App\Category', 'parent_id');
}
public function children() {
return $this->hasMany('App\Category', 'parent_id');
}
}
My add sub category form:
<form role="form" method="POST" action="{{ route('admin.category.postsub', $category->id) }}">
{{ csrf_field() }}
<li class="collection-item blue">
<h5 class="white-text text-center">
Sub-Category to {{ $category->name }}
</h5>
</li>
<li class="collection-item">
<div class="form-group{{ $errors->has('name') ? ' has-error' : '' }}">
<input type="text" class="form-control" name="name" value="{{ old('name') }}" placeholder="Add Sub-Category">
#if($errors->has('name'))
<span class="help-block">{{ $errors->first('name') }}</span>
#endif
</div>
</li>
<li class="collection-item blue">
<div class="form-group text-center">
<button type="submit" class="btn btn-link grey lighten-5">Create Sub-Category</button>
</div>
</li>
</form>
And my Database structure:
I particulary need help in my addPostSubCategories() function in my CategoriesController, because right now if I add a new SUB category, it just adds a new Parent Category, not a sub category

Answer 1

Visit here to see a detailed explanation: https://laravel.com/docs/5.2/eloquent-relationships#inserting-related-models
Here's what you want:
/**
* #param $id
* #param CategoryRequest $request
* #return \Illuminate\Http\RedirectResponse
*/
public function addPostSubCategories($id, CategoryRequest $request) {
// Find the Parent Category
$category = Category::findOrFail($id);
// Create the new Subcategory
$subcategory = new Category($request->all());
// Save the new subcategory into the relationship
$category->children()->save($subcategory);
// Flash a success message
flash()->success('Success', 'Sub Category added successfully!');
// Redirect back to Show all categories page.
return redirect()->route('admin.category.show');
}