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Dir : ~/var/www/html/app/Http/Controllers/Admin/

Edit File: NewsController.php

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Image;
use App\Models\News;
use App\Models\StaticPage;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class NewsController extends Controller
{
    function index(){

return view('admin.news.index',
            ['rows'=>  News::all() ]
        );
    }
    function add(){

return view('admin.news.add');
    }

public function save(Request $request)
    {
        $rules = [
            "title"=>"required",
            "image" => "required",
            "description" => "required",
            "content" => "required",
        ];

try {
            $this->validate($request,$rules  );
            DB::beginTransaction();
            $newsObj = new News();
            $newsObj->title = $request->title;
            $newsObj->slug = Str::slug($request->title, '-');
            $newsObj->description = $request->description;
            $newsObj->content = $request['content'];

$fileName = time().'_'.$newsObj->slug.'.'.$request->file('image')->getClientOriginalExtension();
            $filePath = $request->file('image')->move('uploads', $fileName);
            $newsObj->image = $filePath;

$newsObj->save();
            $uploadedFileHandler = $request->file_handler;
            $imageObj = new Image();
            $imageObj->clean();

$imageObj->where('key',$uploadedFileHandler)
                ->update(['content_id'=>$newsObj->id , 'key'=>'' ]);
            DB::commit();
            return redirect()->route('admin-news-index')->with('success','News has been saved');
        } catch (\Exception $exception) {

DB::rollBack();

return redirect()->back()
                ->withInput()
                ->withErrors(['error' => $exception->getMessage()]);
        }

}

public function edit(News $news)
    {
        return view('admin.news.edit', ['row'=>$news]);
    }

public function update(Request $request)
    {
        $rules = [
            "title"=>"required",

"description" => "required",
            "content" => "required",
        ];

try {
            $this->validate($request,$rules  );
            DB::beginTransaction();
            $newsObj = News::findOrFail($request->id);

$newsObj->title = $request->title;
            $newsObj->slug = Str::slug($request->title, '-');
            $newsObj->description = $request->description;
            $newsObj->content = $request['content'];

if ($request->hasFile('image')) {
                $fileName = time().'_'.$newsObj->slug.'.'.$request->file('image')->getClientOriginalExtension();

$filePath = $request->file('image')->move('uploads', $fileName);
                if(file_exists(public_path('/'). $newsObj->image)) {
                    unlink(public_path('/'). $newsObj->image);
                }
                $newsObj->image = $filePath;
            }

$uploadedFileHandler = $request->file_handler;
            $imageObj = new Image();
            $imageObj->clean();
            $newUploadedFiles = $imageObj->where('key',$uploadedFileHandler);

if($newUploadedFiles) {
                $newUploadedFiles->update(['content_id'=>$newsObj->id , 'key'=>'' ]);
            }

$newsObj->save();
            DB::commit();

return redirect()->route('admin-news-index')->with('success','News has been updated');
        } catch (\Exception $exception) {
            DB::rollBack();
            return redirect()->back()
                ->withInput()
                ->withErrors(['error' => $exception->getMessage()]);
        }
    }

public function delete(News $news)
    {

try {
            DB::beginTransaction();
            if( $news->image && file_exists(public_path('/'). $news->image)){
                unlink(public_path('/').$news->image);
            }
            foreach ( $news->gallery as $image) {
                if(file_exists(public_path('/'). $image->image)) {
                    unlink(public_path('uploads/gallery/').$image->image);
                }
                $image->delete();
            }

$news->delete();
            DB::commit();

return redirect()->route('admin-news-index')->with('success','News has been deleted');
        } catch (\Exception $exception) {
            DB::rollBack();
            return redirect()->back()
                ->withInput()
                ->withErrors(['error' => $exception->getMessage()]);
        }

}