Insert primary key as foreign key in another table - Laravel-6

@shami003 Change your route that your store method will have parameter product then you can do it like this

public function store(Request $request, Product $product)
{
    $bid = new Bidding();
    $bid->bidamount = request('bidamount');
    $bid->user_id = auth()->user()->id;
    $bid->auction_id = $product->auction->id;
    $bid->save();

    return redirect('products.show')->with('success', 'You bid has been placed');
}

@michaloravec Hey thanks for the response.

I am getting the error

Trying to get property 'id' of non-object

Also, redirect page shows 404 error

@shami003 Could you post your routes?

@michaloravec Here is my routes:

<?php

Auth::routes();

Route::get('/home', 'HomeController@index')->name('home');

Route::get('/', 'PagesController@index');
Route::get('/contact', 'PagesController@contact');
Route::get('/itemdetails', 'PagesController@itemdetails');
Route::get('/sellproduct', 'PagesController@createAuction');
Auth::routes();

Route::get('/home', 'HomeController@index')->name('home');

Route::get('/seller', 'PagesController@seller');

Route::resource('admin/users', 'AdminUsersController');

Route::resource('products', 'ProductsController');

Route::resource('biddings', 'BiddingsController');

@shami003 You can make it more simple like.

Add hidden input to your form like this.

{!! Form::open(['action' => 'BiddingsController@store', 'method' => 'POST']) !!}
    <div class="form-inline">
        {{Form::number('bidamount', '',['class' => 'form-control mr-1', 'placeholder' => 'Place your bid'])}}
        
        <input type="hidden" name="auction_id" value="{{ $products->auction->id }}">

        {{Form::submit('Place Bid', ['class' => 'btn btn-primary'])}}
    </div>
{!! Form::close() !!}

Then you have auction id in your controller.

public function store(Request $request)
{
    $auction = Auction::findOrFail($request->auction_id);

    $bid = new Bidding();
    $bid->bidamount = request('bidamount');
    $bid->user_id = auth()->user()->id;
    $bid->auction_id = $auction->id;
    $bid->save();

    return redirect('products.show')->with('success', 'You bid has been placed');
}

@michaloravec so cool. I am thinking about it for 2 days and didn't do that. Thank you so much.

How do I show bids only placed on that specific product?

 @if($biddings)
	@foreach ($biddings as $bidding)
                <tr>
                  <td>{{$bidding->user->name}}</td>
                  <td>{{$bidding->bidamount}}</td>
                  <td>{{$bidding->created_at}}</td>
                </tr> 
	@endforeach
@endif

Full code for show view is given above.

Also I want to redirect to same page when I place the bid

@shami003 Also if it was correct answer before what I posted could you mark it as best reply? Thanks.

// in controller something like this

$product = Product::with('auction.biddings')->first();

// in view

@if ($product->auction->biddings->isNotEmpty())
    @foreach ($product->auction->biddings as $bidding)
        <tr>
            <td>{{$bidding->user->name}}</td>
            
            <td>{{$bidding->bidamount}}</td>
            
            <td>{{$bidding->created_at}}</td>
        </tr> 
    @endforeach
@endif

For return back from your store method

return back()->with('success', 'You bid has been placed');

@michaloravec Thank you so much. You helped a lot :)