我正在尝试更新我的"Trip Name" (user_trips表中的name字段)。
我跟随"Laravel从零开始:更新记录和急于加载"视频，但它不更新，但我确实得到重定向回来，并得到会话msg"你的旅行已被重命名"。我能看到的唯一区别是我使用的是一个页面(而不是/edit页面)。
问题是，在Laravels模型。php类的$exists变量是false，所以它在update()方法返回false。
为什么$exists是假的?
routes.php
<?php
Route::get('/', 'TripBuilderController@index');
Route::post('add_flight', 'FlightController@store');
Route::patch('trip/{trip}', 'TripBuilderController@update');
TripBuilderController
<?php
namespace App'Http'Controllers;
use App'Airport;
use App'UserTrips;
use Illuminate'Http'Request;
/**
* Class TripBuilderController
*
* @package App'Http'Controllers
*/
class TripBuilderController extends Controller
{
/**
* @return 'Illuminate'Contracts'View'Factory|'Illuminate'View'View
*/
public function index()
{
$airports=Airport::all();
$user_trips=UserTrips::whereUserId(1)->with('userflights.flightfrom', 'userflights.flightto')->get();
return view('welcome', compact('airports', 'user_trips'));
}
/**
* @param Request $request
* @param UserTrips $user_trips_obj
*/
public function update(Request $request, UserTrips $user_trips_obj)
{
# Returns {"_token":"RANDOM TOKEN","_method":"PATCH","name":"New Trip Name"}
//return $request->all();
$user_trips_obj->update($request->all());
# Returns []
//return $user_trips_obj;
# Results below.
//dd($user_trips_obj);
return back()->with('msg', 'Your trip has been renamed');
}
}
<?php
namespace App;
use Illuminate'Database'Eloquent'Model;
/**
* Class UserTrips
*
*/
class UserTrips extends Model
{
/**
* Indicates if the model should be timestamped.
*
* @var bool
*/
public $timestamps=FALSE;
/**
* The attributes that are mass assignable.
*
* @var array
*/
protected $fillable=[
'name',
'user_id'
];
/**
* @param UserFlights $user_flights_obj
* @return Model
*/
public function addFlight(UserFlights $user_flights_obj)
{
return $this->userflights()->save($user_flights_obj);
}
/**
* @return 'Illuminate'Database'Eloquent'Relations'HasMany
*/
public function userflights()
{
return $this->hasMany(UserFlights::class);
}
/**
* @return mixed
*/
public function addTrip()
{
# Retrieve the trip by the attributes, or instantiate a new instance...
$trip_obj=$this->firstOrNew(['user_id'=>1]);
if(!$trip_obj->id)
{
$trip_obj->name='My Trip';
$trip_obj->save();
}
return $trip_obj;
}
}
welcome.blade.php
@extends('layouts.master')
@section('title', 'Trip Builder')
@section('content')
<div id="airport_form">
<form method="POST" action="/add_flight">
{{ csrf_field() }}
<div class="form-group">
<select class="form-control" name="flight_from">
@foreach($airports as $airport)
<option value="{{ $airport->id }}">{{ $airport->name }}</option>
@endforeach
</select>
</div>
<div class="form-group">
<select class="form-control" name="flight_to">
@foreach($airports as $airport)
<option value="{{ $airport->id }}">{{ $airport->name }}</option>
@endforeach
</select>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary">Add Flight</button>
</div>
</form>
</div>
<div id="trip_info">
<div id="trip_form">
<form method="POST" action="/trip/{{ $user_trips[0]->id }}">
{{ csrf_field() }}
{{ method_field('PATCH') }}
<label for="trip_name">Trip Name:</label> <input type="text" name="name" id="trip_name" class="form-control" value="{{ $user_trips[0]->name }}"><button type="submit" class="btn btn-primary">Rename Trip</button>
</form>
</div>
<div id="flight_info">
<table class="table table-striped table-bordered table-hover">
<tr>
<th>
From
</th>
<th>
To
</th>
<th>
Options
</th>
</tr>
@foreach($user_trips[0]->userflights as $user_flight)
<tr>
<td>
{{ $user_flight->flightfrom->name }}
</td>
<td>
{{ $user_flight->flightto->name }}
</td>
<td>
<a href="#">Remove</a>
</td>
</tr>
@endforeach
</table>
</div>
</div>
@stop
dd ($ user_trips_obj);结果
UserTrips {#156 ▼
+timestamps: false
#fillable: array:2 [▼
0 => "name"
1 => "user_id"
]
#connection: null
#table: null
#primaryKey: "id"
#keyType: "int"
#perPage: 15
+incrementing: true
#attributes: []
#original: []
#relations: []
#hidden: []
#visible: []
#appends: []
#guarded: array:1 [▼
0 => "*"
]
#dates: []
#dateFormat: null
#casts: []
#touches: []
#observables: []
#with: []
#morphClass: null
+exists: false
+wasRecentlyCreated: false
}
我看到的一个问题是，Laravel的路由模型绑定将无法正常工作，因为你已经在routes.php中命名了模型trip。但是，在TripBuilderController类中，您将其命名为$user_trips_obj。它应该重命名为trip，否则你需要在routes.php中明确地重新定义它。
那么，这个
public function update(Request $request, UserTrips $user_trips_obj)
public function update(Request $request, UserTrips $trip)
因为在routes.php
中将trip参数定义为trip Route::patch('trip/{trip}', 'TripBuilderController@update');
参见Route Model Binding- Laravel Documentation
不要在请求中添加_token或_method。
$user_trips_obj->update($request->except(['_token', '_method']);
我的想法是，你失败的massassignmtnexception由于这些字段没有被列入白名单。
沿着这些行，确保您已经将name作为模型中的可填充属性
protected $fillable = ['name'];