如何 select 特定列并从这些列中获取数据并将它们存储在另一个表的不同列中？ （拉拉维尔）

Question

hope you all are doing well. I have two tables in my database purchase__request and purchase_order. So what I was trying to do is get the data from the columns item_name, description, item_qty, dep_name which there status ='Approved' from the purchase__request table. And then store them in the purchase_order table with column names as follows: item_name, description, item_qty, dep_name; and still be able to fill in the other columns in this (purchase_order) table. So when I use the following code below it shows me this Error:

Attempt to assign property "[{"item_name":"Paper","description":"A4 size","item_qty":15,"dep_name":"Accounting & Finance"},{"item_name":"d","description":"a","item_qty":4,"dep_name":"Accounting & Finance"}]" on null

PO.blade.php:

 <form  action="{{url('/addPO')}}"  method="POST">
                        @csrf
                        <div class="form-group row">
                   <label class="col-lg-4 col-form-label" for="po_date">Order Date <span class="text-danger">*</span>
                   </label>
                   <div class="col-lg-6">
                       <input type="date" class="po_date" id="po_date" name="po_date" required="">
                   </div>
               </div>
               <br>
                        <div class="table-responsive">
                    <table class="table text-start align-middle table-bordered table-hover mb-0">
                        <thead>
                            <tr class="text-dark">
                                <th scope="col">PR ID</th>
                                <th scope="col">Item Name</th>
                                <th scope="col">Description</th>
                                <th scope="col">Quantity</th>
                                <th scope="col">Department</th>
                        
                        
                                
                            </tr>
                        </thead>
                        @foreach($PO as $PO)
                        <tbody>
                            <tr>
                                <td><input type="text"value="{{$PO->PR_id}}"hidden="">{{$PO->PR_id}}</td>
                                <td><input type="text"value="{{$PO->item_name}}"hidden="">{{$PO->item_name}}</td>
                                <td><input type="text"value="{{$PO->item_name}}"hidden="">{{$PO->description}}</td>
                                <td><input type="text"value="{{$PO->item_qty}}"hidden="">{{$PO->item_qty}}</td>
                                <td><input type="text"value="{{$PO->dep_name}}"hidden="">{{$PO->dep_name}}</td>
                            </tr>
                           
                        </tbody>
                        @endforeach
                    </table>

                </div>
                <br>
                <br>                    
                <div class="form-group row" >
                   <label class="col-lg-4 col-form-label" for="sum" >Sum<span class="text-danger">*</span></label>
                   <div class="col-lg-6">
                       <input type="number" class="sum" id="sum" name="sum" required="">
                   </div>
               </div>
              
               <div class="form-group row" >
                   <label class="col-lg-4 col-form-label" for="vat" >Vat<span class="text-danger">*</span></label>
                   <div class="col-lg-6">
                       <input type="number" class="vat" id="vat" name="vat" required="">
                   </div>
               </div>
               <div class="form-group row" >
                   <label class="col-lg-4 col-form-label" for="approved_by">Approved By<span class="text-danger">*</span>
                   </label>
                   <div class="col-lg-6">
                       <input type="text" class="approved_by" id="approved_by" name="approved_by" required="">
                   </div>  
               </div>
               <br><br> 
               <div class="form-group row">
                   <div class="">
                       <input type="submit" class="btn btn-success" name="submit" value="Submit" >                                  
                   </div>
               </div>
              </form>

Routes:

Route:: view('addPO', 'admin.PO');

Route::post('/addPO', [AdminController::class, 'addDataOrder']);

My function in AdminController:

     public function addDataOrder(Request $request)
{
    $PO= new purchase_order();
    $PO->po_date=$request->po_date ;
    $PO->sum =$request->sum ;
    $PO->vat =$request->vat;
    $PO->approved_by =$request->approved_by ;
    
    $PO=DB::table("purchase__requests")->select('item_name','description','item_qty','dep_name')->where('status', 'Approved')->get();
     foreach($PO as $key->$PO){ 
    DB::table("purchase_order")->insert(
    [
                    'item_name' => $PO->item_name,
                    'description'=>$PO->description,
                     'item_qty '=>$PO->item_qty, 
                    'dep_name '=>$PO->dep_name,
    ]);   
                                }

    $PO->save();
    
    return redirect()->back();
}   

Please help me I'm new to Laravel.

Answer 1

Laravel uses Models as associations with database tables. You can read more here - https://laravel.com/docs/9.x/eloquent#introduction . Bookmark the Laravel docs, they are very useful.

From what I can see so far, you will need two new models - PurchaseRequest and PurchaseOrder

As in Laravel's docs, you can create a model with the artisan command: php artisan make:model PurchaseRequest

Also, your purchase__requests table should be renamed to purchase_requests (single underline instead of two).

You really need to read at least some of the Laravel docs to be productive with Laravel. I hope you take your time to at least read the link I've sent you.

Anyway, after you create your models, you could then save the purchase order this way:

$purchaseOrder = new PurchaseOrder();
$purchaseOrder->po_date = $request->po_date;
$purchaseOrder->sum = $request->sum;
// and so on for other fields, then we save the model and this will write the data to the database
$purchaseOrder->save();

You should also do some validation for the $request variable to make sure that you don't save invalid stuff, such as the po_date being a thousand years in the past, etc. You can read more about how to do validation with Laravel here - https://laravel.com/docs/9.x/validation#main-content