title: Laravel saving dynamic input data array in to database
body: <p>I'm trying to save a dynamic form in laravel. unable to save data array in to data base. following is the form. 
  <a href="https://i.stack.imgur.com/H4tiA.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H4tiA.jpg" alt="enter image description here"></a></p>
  
  <p><strong>normal form fields in short</strong></p>
  
  <pre><code>{!! Form::select('customer_id', ['' =&gt; 'Select a customer'] + $customer_list ,null , array('class' =&gt; 'form-control', 'id' =&gt; 'customer')) !!}
  {!! Form::text('mileage_in', null, ['class' =&gt; 'form-control', 'placeholder' =&gt; 'Mileage In']) !!}
  .
  .
  .etc...
  </code></pre>
  
  <p><strong>Dynamic form fields</strong></p>
  
  <pre><code>{!! Form::select('item_id[][item_id]', $items, null, array('class' =&gt; 'form-control')) !!}
  {!! Form::text('item_description[][item_description]', null, ['class' =&gt; 'form-control', 'placeholder' =&gt; 'Not Required | Optional']) !!}
  {!! Form::text('units[][units]', null, ['class' =&gt; 'form-control', 'placeholder' =&gt; 'Add Units']) !!}
  {!! Form::text('rate[][rate]', null, ['class' =&gt; 'form-control', 'placeholder' =&gt; 'Add Rate']) !!}
  {!! Form::text('amount[][amount]', null, ['class' =&gt; 'form-control', 'placeholder' =&gt; 'Add Hrs and Rate', 'id' =&gt; 'amount']) !!}
  </code></pre>
  
  <p>all those fields are in same form.
  I'm saving these data into three different tables. </p>
  
  <p>following are the models i created.<br>
  <strong>Estimate model for estimates table</strong></p>
  
  <pre><code>class Estimate extends Model
  {
      protected $fillable = [
          'customer_id',
          'vehicle_id',
          'mileage_in',
          'net_amount',
          'parent_estimate_id',
          'department',
          'created_by'
      ];
      public function customer(){
          return $this-&gt;belongsTo('App\Customer');
      }
      public function vehicle(){
          return $this-&gt;belongsTo('App\Vehicle');
      }
      public function estimate_details(){
          return $this-&gt;hasMany('App\EstimateDetail');
      }
  }
  </code></pre>
  
  <p><strong>EstimateDetail model for estimate_details table</strong></p>
  
  <pre><code>class EstimateDetail extends Model
  {
      protected $fillable = [
          'estimate_id',
          'item_id',
          'item_description',
          'units',
          'rate',
          'labor_amount_final',
          'initial_amount',
          'task_status'
      ];
      public function item()
      {
          return $this-&gt;hasMany('App\Item');
      }
      public function estimate()
      {
          return $this-&gt;belongsTo('App\Estimate');
      }
  }
  </code></pre>
  
  <p><strong>Item model for items table</strong></p>
  
  <pre><code>class Item extends Model
  {
      protected $fillable = [
          'name',
          'type',
          'location',
          'quantity',
          'sale_price',
          'unit_of_sale',
          'pre_order_level',
          'created_by',
          'category_id',
          'service_only_cost',
          'updated_at'
      ];
      public function estimate_details()
      {
          return $this-&gt;hasMany('App\EstimateDetail');
      }
  }
  </code></pre>
  
  <p>Following code is the <strong>EstimatesController</strong></p>
  
  <pre><code>class EstimatesController extends Controller
  {
  public function store(EstimateRequest $request)
      {
          $user_id = '1';
  
          $input = $request-&gt;all();
  
          $vehicle = new Vehicle();
          $vehicle-&gt;customer_id = $input['customer_id'];
          $vehicle-&gt;reg_no = $input['reg_no'];
          $vehicle-&gt;make = $input['make'];
          $vehicle-&gt;model = $input['model'];
          $vehicle-&gt;created_by = $user_id;
  
          $estimate = new Estimate();
          $estimate-&gt;customer_id = $input['customer_id'];
          $estimate-&gt;vehicle_id = $input['vehicle_id'];
          $estimate-&gt;mileage_in = $input['mileage_in'];
          $estimate-&gt;department = $input['department'];
          $estimate-&gt;created_by = $user_id;
  
          $estimate_detail = new EstimateDetail();
          $estimate_detail-&gt;item_id = $input['item_id'];
          $estimate_detail-&gt;item_description = $input['item_description'];
          $estimate_detail-&gt;units = $input['units'];
          $estimate_detail-&gt;rate = $input['rate'];
          $estimate_detail-&gt;initial_amount = $input['amount'];
  
          $vehicle-&gt;save($request-&gt;all());
          $vehicle-&gt;estimate()-&gt;save($estimate);
          $estimate-&gt;estimate_details()-&gt;save($estimate_detail);
        }
          return redirect('/estimates');
    }
  </code></pre>
  
  <p>I can successfully save vehicle and estimate data on tables vehicles and estimates. but i'm unable to save estimate details arrays on estimate_details table. tried many different ways but failed at last. </p>