Laravel 5:无法从视图中检索用户输入

我的帖子页面上有一个文本区域输入字段，我正在尝试使用它通过ajax提交用户评论。但是我一直得到SQL错误注释字段不能为空。我很肯定我正在用数据填充该字段。

SQLSTATE[23000]：完整性约束冲突：1048列"注释"不能为空(SQL：插入到comments ( user_id ， comment ， parent_id ， parents ， updated_at ， created_at ( 值 (1， ， ， 0， 2015-10-16 19：16：26， 2015-10-16 19：16：26((

做dd(Input::get('commenter_comment))会给null

我也在控制台中收到此错误

开机自检 http://localhost/reddit/public/posts/post_this_comment 500(内部服务器错误(

这些是我的路线

Route::resource('posts', 'PostsController');
Route::post('posts/post_this_comment', 'PostsController@post_this_comment');

post_this_comment()方法PostsController

public function post_this_comment(Request $request){
    $comment = new Comment;
    $comment->user_id = Auth::id();
    $comment->comment = Input::get('commenter_comment');
    $comment->parent_id = Input::get('commenter_parent');
    if($comment->parent_id > 0){
        $my_parent = Comment::find($comment->parent_id);
        $comment->parents = $my_parent->parents.'.'.$comment->parent_id;
    }else{
        $comment->parents = '0';
    }
    $comment->save();
    $per_page = Input::get('per_page');
    $comment_list = view('eastgate.comment.comment_list')
        ->with('comments', $this->comment_list($per_page, $request))
        ->with('total_comments', $this->total_comments())
        ->with('per_page', $per_page)
        ->render();
    $response = array(
        'status' => 'success',
        'msg' => 'Comment Saved!',
        'comment_list' => $comment_list
    );
    return Response::json($response);
}

视图

    <div class="comment-fields">
        <div class="row commenter-comment">
             <div class="form-group col-md-12">
                    <textarea id="commenter_comment" name="commenter_comment" class="form-control comment-field" title="User's comment" placeholder="Comment Text"></textarea>
              </div>
         </div>
         <div class="row commenter-name-email">
              <input type="hidden" id="commenter_parent" name="commenter_parent" class="commenter-parent" value="0">
         </div>
         <div class="row commenter-captcha">
              <div class="col-md-3 text-right">
                    <a href="javascript:void(0)" class="btn btn-info post-this-comment">Post</a>
              </div>
         </div>
      </div>
$(document).on('click', 'a.post-this-comment', function(){
    var formData = new FormData();
    var arrayelem = commenter_fields();
    var elem;
    for(var i=0, size = arrayelem.length; i<size; i++){
        elem = arrayelem[i];
        formData.append(elem, $('#'+elem).val());
    }
    formData.append('per_page', $('.comments_per_page').val());
    var request = $.ajax({ // push question data to server
        type        : 'POST', // define the type of HTTP verb we want to use (POST for our form)
        url         : 'post_this_comment', // the url where we want to POST
        data        : formData, // our data object
        dataType    : 'json',
        processData : false,
        contentType : false
    });     
    request.done(comment_done_handler); 
    request.fail(comment_fail_handler); // fail promise callback
});

$comment->comment = $request->input('commenter_comment');
$comment->parent_id = $request->input('commenter_parent');

$(document).on('click', 'a.post-this-comment', function(){ 
var formData = 'commenter_comment='+$('textarea[name=commenter_comment]').val(); 
//formData.append('commenter_comment', $('textarea[name=commenter_comment]').val()); 
console.log(formData); 

var request = $.ajax({ // push question data to server 
type : 'POST', // define the type of HTTP verb we want to use (POST for our form) 
url : 'post_this_comment', // the url where we want to POST 
data : formData // our data object 
}); 
request.done(comment_done_handler); 
request.fail(comment_fail_handler); // fail promise callback 
});

use Illuminate'Http'Request;

if($request->has('commenter_comment'))
{
    $comment->comment = $request->input('commenter_comment');
}