Many to Many form binding - laravel

Question

How to binding a input with many to many relationship data?
My relationship is: a Model has many Damages, and a Damage has many Models. in pivot table exists a price field.
I need populate a input with price data.
{{ Form::input('number', "prices[{$model->id}][{$damage->id}]") }}
My Model:
class Model extends \BaseModel {
public function damages()
{
return $this->belongsToMany('Damage', 'prices_damages', 'model_id', 'damage_id')
->withPivot('price')
->withTimestamps();
}
}
Pivot table
Schema::create('prices_damages', function(Blueprint $table)
{
$table->increments('id');
$table->integer('model_id')->unsigned();
$table->integer('damage_id')->unsigned();
$table->float('price')->nullable();
$table->timestamps();
});
Controller
/**
* Display a index dashboard page.
*
* #return \Illuminate\Http\Response
*/
public function getDamages()
{
$models = \Model::orderBy('order')->get();
$damages = \Damage::orderBy('order')->get();
return $this->render('Avarias', 'prices.damages', compact('models', 'damages'));
}
View:
<table class="table-striped table-header-rotated">
<thead>
<tr>
<th></th>
#foreach ($damages as $damage)
<th class="vertical"><div><span>{{ $damage->name }}</span></div></th>
#endforeach
</tr>
</thead>
<tbody>
#foreach ($models as $model)
<tr>
<td>{{ $model->fullname }}</td>
#foreach ($damages as $damage)
<td>
{{ Form::input('number', "prices[{$model->id}][{$damage->id}]", null, ['min' => 0, 'step' => 0.01]) }}
</td>
#endforeach
</tr>
#endforeach
</tbody>
</table>

Answer 1

You can't bind a collection (in the sense of laravel form model binding), so you can do this:
#foreach ($model->damages as $damage)
{{ Form::input('number', "damages[{$damage->id}][price]", $damage->pivot->price) }}
#endforeach