删除 table 中的记录

Question

使用Laravel 5.2.45

总的来说，我对 Laravel 和 PHP 还比较陌生，所以我正在制作一个 phone 书籍项目，我在其中存储有关人员的联系信息。

我在名为 'phonebook' 的数据库中有一个名为 'contacts' 的 table。

我有一个视图，可以在 table 中记录新条目。

这是观点：

phonebook.blade.php

....... css and stuff here .......
<body>

            <h1> Contact Form </h1><br/>

                        {{-- FORM --}}

            <form method = "POST" action = "contacts">

                {{ csrf_field() }}

                <div class = "form-group
                    @if($errors->has('name')) 
                        has-error
                    @endif"> 
                    <label for = "name"> Name </label><br/>
                    <input type = "text" id = "name" class = "form-control" name = "name" placeholder = "Name your Name" value = "{!! old('name') !!}">
                    @if($errors->has('name')) 
                        <p class = "help-block">{{ $errors->first('name') }}</p> 
                    @endif
                </div><br/>

                <div class = "form-group 
                    @if($errors->has('lastname')) 
                        has-error
                    @endif"> 
                    <label for = "lastname"> Lastname </label><br/>
                    <input type = "text" id = "lastname" class = "form-control" name = "lastname" placeholder = "Name your Lastname" value = "{!! old('lastname') !!}">
                    @if($errors->has('lastname')) 
                        <p class = "help-block">{{ $errors->first('lastname') }}</p> 
                    @endif                        
                </div><br/>

                <div class = "form-group 
                    @if($errors->has('email')) 
                        has-error
                    @endif">
                    <label for = "email"> E-mail </label><br/>
                    <input type = "text" id = "email" class = "form-control" name = "email" placeholder = "somesomething@email.com" >
                    @if($errors->has('email')) 
                        <p class = "help-block">{{ $errors->first('email') }}</p> 
                    @endif
                </div><br/>

                <div class = "form-group 
                    @if($errors->has('phone'))
                        has-error
                    @endif">
                    <label for = "phone"> Phone Number </label><br/>
                    <input type = "text" id = "phone" class = "form-control" name = "phone" placeholder = "I'll call you">
                    @if($errors->has('phone')) 
                        <p class="help-block">{{ $errors->first('phone') }}</p> 
                    @endif
                </div><br/>

                <div class = "form-group"> 
                    <label for = "address"> Address </label><br/>
                    <input type = "text" id = "address" class = "form-control" name = "address" placeholder = "I'll even visit you" value = "{!! old('address') !!}">                        
                </div><br/>

                <div>
                    <button type = "submit" class = "submit"> Submit Information </button>
                    <a href="contacts"><button type = "button"> View Contacts </button></a>
                </div>
            </form>      
        </body>
    </html>

当我记录新条目时，我被重定向到可以看到 table 的视图。结构简单，这是视图：

contacts.blade.php

....... css and stuff here .......
<body>

        <h1> Contacts </h1>

        <br/>

        <div>
            <a href = "phonebook"><button class = "ret" type = "button"> Add New Entry </button></a>
        </div>

        <br/><br/>

        <table class = "contacts">

            <thead>
                <tr>
                    <th> ID       </th>
                    <th> Name     </th>
                    <th> Lastname </th>
                    <th> E-Mail   </th>
                    <th> Phone    </th>
                    <th> Address  </th>
                    <th> Edit     </th>
                    <th> Delete   </th>
                </tr>
            </thead>

            <tbody>
                @foreach($contact as $contact)                                                      
                    <tr class = "tableBody">
                        <td class = "id">       {{ $contact->id }}                                          </td>
                        <td class = "name">     {{ $contact->name }}                                        </td>
                        <td class = "lastname"> {{ $contact->lastname }}                                    </td>
                        <td class = "email">    {{ $contact->email }}                                       </td>
                        <td class = "phone">    {{ $contact->phone }}                                       </td>
                        <td class = "address">  {{ $contact->address }}                                     </td>
                        <td class = "edit">     <a href = "edit"> Edit </a>                                 </td>
                        <td class = "delete">   <a href = "delete"> Delete </a>                             </td>
                    </tr>                       
                @endforeach
            </tbody>
        </table>

        <br/>

        <div>
            <a href = "phonebook"><button class = "ret" type = "button"> Add New Entry </button></a>
        </div>
    </body>
</html>

注意，您会看到我的 table 中有一个 Delete Link，我想用它来删除给定行中的记录。

为此，我有一个删除视图，它在 destroy() 函数中的一段代码之后加载，在我使用 artisan 控制台所做的控制器中提供

这是我的 routes.php 文件，带有注释

routes.php

<?php

use Illuminate\Support\Facades\Input;
use App\Contact;
use App\Http\Controllers;


// default welcome view from Laravel
Route::get('/', function ()
{
    return view('welcome');
});

// getting the routes from the controller
Route::resource('contacts', 'ContactsController');

// getting the form from the controller, wich is in a .blade.php view
Route::get('phonebook', 'ContactsController@index');

// showing the table in a .blade.php view
Route::get('contacts', 'ContactsController@tab');

// the route to post the contact in the table, using the form in the phonebook.blade.php
Route::post('contacts', 'ContactsController@create');

// routing to the destroy function in my controller
Route::get('delete', [
    'as' => 'delete', 'uses' => 'ContactsController@destroy'
]);

// getting the edit.blade.php, not working
// permeate the inputs of name, lastname, email, phone and address
// with the same inputs we have in the row of our table
Route::get('edit', function()
{
    return view('edit');
});

可能是我的路线有问题，所以我也把它贴在这里。

总体而言，这是我的控制器

ContactsController.php 有评论

   <?php

    namespace App\Http\Controllers;

    use App\Contact;
    use DB;
    use Illuminate\Http\Request;

    use App\Http\Requests;

    use Illuminate\Support\Facades\Input;
    use Validator;


    class ContactsController extends Controller
    {
       // showing the form in the phonebook.blade.php
        // the form is structured using html and stuff
        public function index()
        {
            return view('phonebook');
        }

        // showing the table where I save my contacts
        // simple view stuff
        public function tab()
        {
            return view('contacts');
        }

        // the parameters to save my contact, with errors and stuff
        //working since day one
        public function create()
        {
            $rules = array(
                'name'      => 'alpha|min:3|max:15|required',
                'lastname'  => 'alpha|min:3|max:15',
                'email'     => 'required|unique:contacts,email|email',
                'phone'     => 'required|unique:contacts,phone|alpha_num|between:3,25',
                'address'   => 'max:255',
            );

            $messages = array(
                'alpha'     => 'The :attribute must contain only letters.',
                'max'       => 'The :attribute must have a maximum of 15 letters.',
                'min'       => 'The :attribute must have at least 3 characters.',
                'required'  => 'The :attribute is really important. We are storing your contact info after all...',
                'email'     => 'The :attribute must be a valid e-mail format address.',
                'numeric'   => 'The :attribute must contain only numbers.',
                'between'   => 'The :attribute content must have a lenght between 3 and 25 characters.',
            );

            $validator = Validator::make(Input::all(), $rules, $messages);

            if ($validator->fails())
            {
                $messages = $validator -> messages();

                return redirect('phonebook')
                    ->withInput()
                    ->withErrors($validator);
            }
            else 
            {
                $contact             = new Contact;
                $contact-> name      = Input::get('name');
                $contact-> lastname  = Input::get('lastname');
                $contact-> email     = Input::get('email');
                $contact-> phone     = Input::get('phone');
                $contact-> address   = Input::get('address');

                $contact->save();

                // $contact =  App\Contact::all();

                return view('contacts', compact('contact'));
            };
        }

我也有一个编辑功能，但是没有用，但我不关心它。

我以多种方式编辑了销毁函数。

现在我将在此处列出它们，包括它们return编辑的评论和错误。

因为每个函数都应该 return delete.blade.php，所以我不会在下面的代码中写这一行。

销毁函数1

//error: undefined variable in the findOrFail()
$contact = Contact::findOrFail($contact);
$contact->delete();

独立于我想在 findOrFail() 中传递的参数，无论是 $id、$name，还是 uniques $phone 或 $email，错误与评论中提到的相同代码。

销毁函数2

//FatalErrorException in ContactsController.php line 93:
//Class 'App\Http\Controllers\Contacts' not found
Contacts::where('id','=',$id);
$id->delete();

在这个和下一个中，我什至不知道如何摆脱这个错误。

销毁函数 3

//Same error as above
//Class not found
$contact = Contacts::where('id', '=', $id);
$contact->delete();

接下来，我添加了一个 if 语句来检查一切是否正常。

销毁函数4

//Class contacts not found
$id = contacts::where('id', $id)->first();
if ($id != null) {
    $id->delete();
return view('delete'); 
}else{
return view('delete')->with(['message'=> 'Contact not found']);
};

下一个return我不明白的错误。

销毁函数5

//Call to a member function delete() on null
//I don't know what that is supposed to mean
$id = Contact::all();
Contact::find($id) -> delete();

现在，下一段代码感觉是最好的，因为它 return 正在删除视图，但没有删除我的 table 中的条目，不是即使使用 forceDelete().

销毁函数6

//loading the view page, but not deleting the entry
// not even using forceDelete()
Contact::where('id', '=', '$id') 
    -> where('name', '=', '$name')
    -> delete();

最后，我想，只是为了好玩，我发布了下一行代码，当我单击 table

中的删除 link 时，它会关闭我的服务器

//This line destroys my local server
//I have to up it again, using art serve command line
// $this -> destroy(Contact::get());

所以，我在使我的销毁功能起作用时遇到了问题。

这就是我需要的

我需要对我的功能进行一些更正，如果其中一个功能中的一个更正，我会非常满意。重申一下，NONE 这些函数正在运行，其中每个函数 return 都存在某种错误，正如你们都可以在代码本身提供的注释中看到的那样。

就像我之前说的，destroy 函数 6 是我认为会起作用的函数，因为它正在 returning 视图我想要，它只是不删除我在 table.

中的条目

此外，我发布了所有这些代码，因为错误可能是从后面一直传来的。

随意询问其他文件，例如模型、迁移和其他文件。

编辑

这是我的联系人模型：

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Contact extends Model
{
    // not using an id field
    // could this be the error?
    // isn't laravel making an automatic id field?
    // dunno
    public $fillable = array('name', 'lastname', 'email', 'phone', 'address');

    //added because of error at migration
    public $timestamps = false; 
}

如代码中所述，我必须为 timestamps 添加 false 语句，因为它 return 出错了。

现在，这里有些东西有点管用。

我采用了第一个销毁函数并将其应用到我的代码中。错误还是一样，undefined variable in the findOrFail().

所以，我定义了变量，我不知道这是不是惯例。这是它的样子。

$contact=Contact::first();
Contact::find($contact->id);
$contact->delete();

但是，这段代码删除了 我 table 中的第一个 条目，与我单击删除按钮的位置无关，这是有道理的，那是 first()那边

所以，既然这有点管用，我用什么语句让它删除我想要的条目？

结束编辑

很抱歉问题中的代码过多。提前谢谢大家。

Answer 1

** 编辑 **

您需要更新删除按钮所在的 blade 模板，以将联系人 ID 作为 url

的一部分传递

<tbody>
                @foreach($contact as $contact)                                                      
                    <tr class = "tableBody">
                        <td class = "id">       {{ $contact->id }}                                          </td>
                        <td class = "name">     {{ $contact->name }}                                        </td>
                        <td class = "lastname"> {{ $contact->lastname }}                                    </td>
                        <td class = "email">    {{ $contact->email }}                                       </td>
                        <td class = "phone">    {{ $contact->phone }}                                       </td>
                        <td class = "address">  {{ $contact->address }}                                     </td>
                        <td class = "edit">     <a href = "edit"> Edit </a>                                 </td>
                        <td class = "delete">   <a href = "delete/{{ $contact->id }}"> Delete </a>                             </td>
                    </tr>                       
                @endforeach
            </tbody>

然后更新您的删除路由以将 id 包含在 url

Route::get('delete/{id}', [
    'as' => 'delete', 'uses' => 'ContactsController@destroy'
]);

然后让您的 Controller destroy 方法接受 id

public function destroy($id)
{
   $contact = Contact::findOrFail($id);
   $contact->delete();
}

原版

为此使用 $contact->id。 findOrFail 需要传递 id。

销毁函数1

//error: undefined variable in the findOrFail()
$contact = Contact::findOrFail($contact->id);
$contact->delete();

销毁函数2

您似乎没有联系人 class 的导入语句。检查您的联系人 class 的命名空间并将其添加到控制器的顶部 class:

use App\Contact;

$contact = Contact::where('id','=',$id)->get();
$contact->delete();

或

Contact::destroy($id);

销毁函数3

同上。添加 import/use 语句。

//Same error as above
//Class not found
$contact = Contact::where('id', '=', $id)->get();
$contact->delete();

删除 table 中的记录

Deleting a record in a table

php

laravel-5.2