AJAX post values becomes boolean after reaching the CI controller

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Ajax

CodeIgniter

I been searching in google for days but still got no answer to solve this. I have this ajax function which update a record in mysql database. When I use ajax to insert a new record, everything is smooth but when I update this record thru ajax it gives me 403 Forbidden response. When I use var_dump to check the values pass from ajax all values became boolean. Below is my code, hope you can help me.

AJAX

$.ajax({
    url:'updateDeal',
    async:false,
    type:'post',
    data:{
        dealId:dealId,
        dealName:dealName,
        dealLocation:dealLocation,
        dealCategory:dealCategory,
        dealDescription:description,
        dealValidDate:dealValidDate,
        dealRegularPrice:dealRegularPrice,
        dealPromoPrice:dealPromoPrice,
        dealHighlights:tourHighlight,
        dealInclusion:inclusions,
        dealItenerary:itinerary,
        dealAdditionalServices:additional,
        isPromo:isPromo,
        isPublish:isPublish
    },
    beforeSend: function(){
        $('.image-loader').show();
    },
    success:function(results){
        var obj = $.parseJSON(results);
        if(!obj.hasError){
            $('.image-loader').hide();
            window.location = 'success?id=2';
        }
    }
});

Controller

public function updateDeal(){

        $data = array(
            "Id"                    => $this->input->post('dealId'),
            "dealName"              => $this->input->post('dealName'),
            "dealLocation"          => $this->input->post('dealLocation'),
            "dealCategory"          => $this->input->post('dealCategory'),
            "dealDescription"       => $this->input->post('dealDescription'),
            "dealValidDate"         => $this->input->post('dealValidDate'),
            "dealRegularPrice"      => $this->input->post('dealRegularPrice'),
            "dealPromoPrice"        => $this->input->post('dealPromoPrice'),
            "dealHighlights"        => $this->input->post('dealHighlights'),
            "dealInclusion"         => $this->input->post('dealInclusion'),
            "dealItenerary"         => $this->input->post('dealItenerary'),
            "dealAdditionalServices" => $this->input->post('dealAdditionalServices'),
            "isPromo"               => $this->input->post('isPromo'),
            "isPublished"           => $this->input->post('isPublish')
        );
        var_dump($data);

    }

RESULT

array(14) {
  ["Id"]=>
  bool(false)
  ["dealName"]=>
  bool(false)
  ["dealLocation"]=>
  bool(false)
  ["dealCategory"]=>
  bool(false)
  ["dealDescription"]=>
  bool(false)
  ["dealValidDate"]=>
  bool(false)
  ["dealRegularPrice"]=>
  bool(false)
  ["dealPromoPrice"]=>
  bool(false)
  ["dealHighlights"]=>
  bool(false)
  ["dealInclusion"]=>
  bool(false)
  ["dealItenerary"]=>
  bool(false)
  ["dealAdditionalServices"]=>
  bool(false)
  ["isPromo"]=>
  bool(false)
  ["isPublished"]=>
  bool(false)
}