Question

我正在尝试创建包含评论的帖子页面;但是，当我将评论添加到帖子时，它不起作用，因为系统无法识别帖子ID。我错误的是它不知道post_id等于$ post_id

我收到以下错误：

SQLSTATE [HY000]：常规错误：1364字段'post_id'没有默认值（SQL：插入comments body，updated_at，{{1} }）值（这是测试评论，2017-08-15 19：51：47,2017-08-15 19:51:47））

评论表格

created_at

ROUTE

 <div class="well">
    <h4>Leave a Comment:</h4>

    <form role="form" method="post" action="{{ $post->id }}/comments">
    {{  csrf_field() }}

       <div class="form-group">
          <textarea name="body" class="form-control" rows="3"></textarea>
       </div>

       <button type="submit" class="btn btn-primary">Submit</button>
    </form>
 </div>

CONTROLLER

Route::post('/posts/{post}/comments', 'CommentController@store');

评论模型

public function store(Post $post)
{
    $post->addComment(request('body'));

    return back();
}

POST MODEL

class Comment extends Model
{
    protected $fillable = ['body'];

    public function post()
    {
        return $this->belongsTo(Post::class);
    }
}

Answer 1

post_id不属于可填充数组：

class Comment extends Model
{
    protected $fillable = ['body', 'post_id']; //<---
    ...
}

Answer 2

在mysql的表中

确保你的post_id是自动增量或可以是“null”。这个错误说post_id没有值，不能默认。

从代码的外观看，post_id是你的主键，但没有设置为自动增量

Answer 3

我明白了，你的控制器功能还不知道你说的是什么帖子。你需要使用从你的表单返回的帖子ID并找到帖子然后你可以保存这样的新评论

$ ansible-playbook test_sequenceeasy.yml
[WARNING]: log file at '{{planfile | dirname}}/AnsibleLog.txt' is not writeable and we cannot create it, aborting


PLAY [localhost] ***************************************************************

TASK [debug] *******************************************************************
ok: [localhost] => {
    "listA[0]": "a"
}

TASK [debug] *******************************************************************
ok: [localhost] => {
    "listB": []
}

TASK [debug] *******************************************************************
ok: [localhost] => {
    "listC": []
}

TASK [set_fact] ****************************************************************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'list object' has no attribute u'0'\n\nThe error appears to have been in '/apps/infra/Tools/Ansible_WLNMiddleware/test_sequenceeasy.yml': line 17, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n          var: listC\n  - set_fact:\n    ^ here\n"}

NO MORE HOSTS LEFT *************************************************************
 [WARNING]: Could not create retry file 'test_sequenceeasy.retry'.         [Errno 2] No such file or directory: ''

如Laravel Docs 5.4 Eloquent所示，它会为您填写内容。

此外，如果我没记错的话，您不需要将['post_id']添加到您的可填写字段数组中。

可以使用“列修饰符”解决SQL错误。（见下文）

$comment = new App\Comment(['message' => 'A new comment.']);

$post = App\Post::find(1);

$post->comments()->save($comment);

Laravel Docs 5.4 Migrations

Laravel模型不起作用

3 个答案: