when click submit error is occur - laravel-5

Question

when click on submit data,data successfully save and show in database but got error in index page, i think don't get it user-id
Trying to get property 'id' of non-object (View:
C:\xampp\htdocs\ytl\resources\views\profile\index.blade.php)
This is index.blade.php file
<form method="post", id="form", action="{{action('Profile\UserProfileController#index')}}" accept-charset="UTF-8">
{{ csrf_field() }}
<div class="row">
<div class="col-md-6 mb-3 form-group">
Exchange:<select name="exchange_id" id="exchange" class="form-control " onchange="myfunc()">
<option value="">Select</option>
#foreach($exchanges as $key=>$val )
<option value="{{ $val->id }}">{{ $val->exchange }}</option>
#endforeach
</select>
{{--{!! Form::label('exchange_id', 'Exchanges: ') !!}--}}
{{--{!! Form::select('exchange_id', ['' => 'Choose Options'] + $exchanges, null, ['class' => 'form-control', 'id' => 'exchange', 'name' => 'exchange_id'])!!}--}}
</div>
<div class="col-md-6 mb-3 form-group">
Market<select name="market_id" id="market" class="form-control bindselect" >
<option value="">Select</option>
{{--#foreach($markets as $key=>$val )--}}
{{--<option value="{{ $val->id }}">{{ $val->market }}</option>--}}
{{--#endforeach--}}
</select>
</div>
<div class="col-md-6 mb-3 form-group">
Country:<select name="country_id" id="country" class="form-control " >
<option value="">Select</option>
#foreach($countries as $key=>$val )
<option value="{{ $val->id }}">{{ $val->country }}</option>
#endforeach
</select>
</div>
<div class="col-md-6 mb-3 form-group">
Company:<select name="brokerage_company_id" id="brokerage_company_id" class="form-control " >
<option value="">Select</option>
#foreach($brokerage_company as $key=>$val )
<option value="{{ $val->id }}">{{ $val->brokerage_company }}</option>
#endforeach
</select>
</div>
<div class="col-md-6 mb-3 form-group">
{{--{!! Form::label('Intraday_Charge', 'Intraday Charge:') !!}--}}
{{--{!! Form::text('Intraday_Charge', null, ['required' => 'required', 'class'=>'form-control number_only'])!!}--}}
Intraday_charge: <input type="text" name="charge_intraday" class="form-control"><br>
</div>
<div class="col-md-6 mb-3 form-group">
Delivery_charge: <input type="text" name="charge_delivery" class="form-control"><br>
</div>
<div class="col-md-6 mb-3 form-group">
Delivery_charge: <input type="text" name="charge_per_lot" class="form-control"><br>
</div>
<div class="col-md-6 mb-3 form-group">
Delivery_charge: <input type="text" name="charge_per_order" class="form-control"><br>
</div>
<div class="mb-3 form-group">
{{--{!! Form::submit('Add trade', ['class'=>'btn btn-success btn-lg']) !!}--}}
<input type="submit" value="Submit">
</div>
</div>
</form>
This is controller in which 2 method. 1st index and 2nd store method
public function index(Request $request){
$exchanges = Exchange::select('exchange','id')->get();
$markets = Market::select('market','id')->get();
$countries = Country::select('country','id')->get();
$brokerage_company = BrokerageCompany::select('brokerage_company','id')->get();
return view('profile.index', compact( 'exchanges','markets','countries','brokerage_company'));
}
public function store(Request $request){
$Input = $request->all();
$user = Auth::user();
$user->userprofile()->create($Input);
$user_id = Auth::user()->id;
$exchanges = Exchange::pluck('exchange','id')->all();
$markets = Market::pluck('market','id')->all();
$countries = Country::pluck('country','id')->all();
$brokerage = BrokerageCompany::pluck('brokerage_company','id')->all();
$user_profile = UserProfile::pluck('charge_intraday','charge_delivery','charge_per_lot','charge_per_order');
return view('profile.index', compact( 'exchanges','markets','countries','brokerage','user_profile'));
}

Answer 1

Since Laravel 5.2 pluck() method of Eloquent builder returns a collection of values from given column. When you call all() on this collection, you simply get an array of values from that first column. For example, when you call
$exchanges = Exchange::pluck('exchange','id')->all();
$exchanges will be an array that contains all values of exchange column in your Exchanges table. Hence the error, as you're trying to access id attribute of this scalar value.
I guess you're trying to limit number of columns fetched from the database. Call select() method instead of pluck():
$exchanges = Exchange::select('exchange','id')->get();