我在构建 laravel restful api 时遇到问题,
我有以下 Controller
<?php
namespace App\Http\Controllers\Kittrans;
use App\Http\Controllers\Controller;
use App\Inventory;
use App\Kittrans;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
class KittransController extends Controller
{
public function index()
{
}
/**
* Show the form for creating a new resource.
*
* @return \Illuminate\Http\Response
*/
public function create()
{
//
}
/**
* Store a newly created resource in storage.
*
* @param \Illuminate\Http\Request $request
* @return \Illuminate\Http\Response
*/
public function store(Request $request)
{
$rules =[
'kmo_id' => 'required',
'item_id' => 'required|integer|min:1',
'store_id' => 'required|integer|min:1',
'count' => 'required|integer|min:1'
];
$this->validate($request,$rules);
// check if requested count of item less than or equal to count in store
$inventory = DB::table('inventories')->where(
[
['item_id','=',$request->input('item_id')],
['store_id','=',$request->input('store_id')]
]
)->get();
if($inventory->count()!=1)
{
return response()->json(['Error'=>'Model not found'],404);
}
$remaining = $inventory->get(0)->count;
if($request->input('count') > $remaining)
{
return response()->json(['Error'=>'Request item count should be less than in the selected store!'],422);
}
// get user id bu auth. but for now i will make it static to complete first version of api
testing
$request['user_id'] = 1;
$newModel = Kittrans::create($request->all());
$remaining = $remaining - $request->input('count');
Inventory::where('id',$inventory->get(0)->id)->update(array('count' => $remaining));
return response()->json($newModel,200);
}
/**
* Display the specified resource.
*
* @param int $id
* @return \Illuminate\Http\Response
*/
public function show(Kittrans $kittrans)
{
//
return response()->json($kittrans,200);
}
/**
* Show the form for editing the specified resource.
*
* @param int $id
* @return \Illuminate\Http\Response
*/
public function edit($id)
{
//
}
/**
* Update the specified resource in storage.
*
* @param \Illuminate\Http\Request $request
* @param int $id
* @return \Illuminate\Http\Response
*/
public function update(Request $request, Kittrans $kittrans)
{
$kittrans->fill($request->only([
'item_id',
'kmo_id',
'count'
]));
if($kittrans->isClean())
{
return response()->json(['Error'=>'You should make some changes in your values to update'],422);
}
$kittrans->save();
return response()->json($kittrans,200);
}
/**
* Remove the specified resource from storage.
*
* @param int $id
* @return \Illuminate\Http\Response
*/
public function destroy(Kittrans $kittrans)
{
//
$kittrans->delete();
return response()->json($kittrans,200);
}
}
和 route/api.php 如下:
Route::resource('kittrans','Kittrans\KittransController',['except'=>['index']]);
当我请求更新数据库中的对象时,问题是一个新模型将使用 $kittrans->save() 方法插入到表中!!
为什么会出现这个问题?
我从 postman 那里收到的请求是这样的:
网址:myApp.test/kittrans/5003
方法:放置、修补
内容类型:应用程序/x-www-form-urlencoded
数据:item_id,kmo_id,count
我也添加了
dd($kittrans);
在 save() 方法之前,我得到了以下内容:
Kittrans {#345
#fillable: array:4 [
0 => "count"
1 => "kmo_id"
2 => "item_id"
3 => "user_id"
]
#connection: null
#table: null
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
#perPage: 15
+exists: false
+wasRecentlyCreated: false
#attributes: array:3 [
"item_id" => "1"
"kmo_id" => "1"
"count" => "7"
]
#original: []
#changes: []
#casts: []
#dates: []
#dateFormat: null
#appends: []
#dispatchesEvents: []
#observables: []
#relations: []
#touches: []
+timestamps: true
#hidden: []
#visible: []
#guarded: array:1 [
0 => "*"
]
}
为什么保存方法要在数据库中创建一个新的模型实例? 我已经在所有其他 Controller 中实现了更新方法,一切正常,但是对于这个 Controller ,我不明白问题出在哪里?
最佳答案
用于模型绑定(bind)的 Controller 方法的参数命名不正确。
你的路由参数是kittran
不是kittrans
;资源路由将使用资源的单数名称作为路由参数。您必须为绑定(bind)匹配该名称:
public function update(Request $request, Kittrans $kittran)
如果没有匹配项,您只会注入(inject)一个新的模型实例,而不是发生模型绑定(bind)。
您可以运行 route:list
命令来查看您的路由是如何定义的:
php artisan route:list
"Laravel automatically resolves Eloquent models defined in routes or controller actions whose type-hinted variable names match a route segment name." - Laravel 6.x Docs - Routing - Route Model Bindings - Implicit Binding
"By default,
Route::resource
will create the route parameters for your resource routes based on the "singularized" version of the resource name." - Laravel 6.x Docs - Controllers - Resource Controllers - Naming Resource Route Parameters
如果你想为这个资源覆盖这个行为,并使用 kittrans
作为参数名,你也可以这样做,那么你不需要改变你的 Controller 方法的签名:
Route::resource('kittrans', 'Kittrans\KittransController', [
'except'=> ['index'],
'parameters' => ['kittrans' => 'kittrans'],
]);
关于php - laravel 中的更新方法将在数据库中创建一个新模型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59059401/