我创建了一个函数，用于更新有关EMI的贷款金额。在此函数中，贷款金额在EMI的创建和删除期间成功更新，但在EMI的更新时不成功。
EMI模型
<?php namespace App;
use Illuminate'Database'Eloquent'Model;
class Emi extends Model {
//
protected $table = 'emi';
protected $fillable = ['loan_id', 'amount', 'description', 'date'];
public function loan()
{
return $this->belongsTo('App'Loan');
}
public static function boot()
{
parent::boot();
static::deleted(function($emi){
$loan='App'Loan::find($emi->loan_id);
$loan->paid -= $emi->amount;
$loan->balance += $emi->amount;
$loan->save();
});
static::saved(function($emi){
$loan='App'Loan::find($emi->loan_id);
$loan->paid += $emi->amount;
$loan->balance -= $emi->amount;
$loan->save();
});
static::updating(function($emi){
$loan='App'Loan::find($emi->loan_id);
$loan->paid -= $emi->amount;
$loan->balance += $emi->amount;
return $loan->save();
});
}
}
Emi控制器
<?php
namespace App'Http'Controllers'Auth;
use Illuminate'Http'Request as Request;
use App'Http'Requests;
use App'Http'Controllers'Controller;
use Validator;
use Response;
use App'Account;
use App'Loan;
use App'Emi;
class EmiController extends Controller
{
/**
* New data validation
* @param array $data
* @return 'Illuminate'Validation'Validator
*/
protected function validator(array $data)
{
return Validator::make($data,[
'loan_id' =>'required|numeric',
'amount' =>'required|numeric|max:999999999999999999',
'description' =>'required|alpha_text|max:250',
'date' =>'required|date',
]);
}
/**
* Display a listing of the Emi resource.
* If loan id is not given, then returns all Emi resource.
* @param Request $request
* @return 'Illuminate'Database'Eloquent'Collection|static[]
*/
public function index(Request $request)
{
$loan_id = $request->get('loan_id');
//All Emi recipets for loan
if($loan_id !==NULL)
return Loan::find($loan_id)->emi;
else
return Emi::with('loan')->get();
}
/**
* Show the form for creating a new resource.
*
* @return Response
*/
public function create()
{
//
}
/**
* Store a newly created resource in storage.
* @param Request $request
* @return Response
*/
public function store(Request $request)
{
$validator = $this->validator($request->all());
if($validator->fails()){
return Response::json( $validator->errors()
,400);
}
$emi = new Emi($request->all());
//TODO Loan balance update
if($emi->save()){
return $emi;
}
return Response::json( ['error' => 'Server is down']
,500);
}
/**
* Display the specified resource.
*
* @param int $id
* @return Response
*/
public function show($id)
{
//
return Emi::find($id);
}
/**
* Show the form for editing the specified resource.
*
* @param int $id
* @return Response
*/
public function edit($id)
{
//
}
/**
* Update the specified resource in storage.
* @param $id
* @param Request $request
* @return 'Illuminate'Http'JsonResponse
*/
public function update($id,Request $request)
{
$validator = $this->validator($request->all());
if($validator->fails()){
return Response::json($validator->errors()
,400);
}
//TODO Update loan balance
$emi = Emi::find($id);
//$emi->fill($request->all());
if($emi->update($request->all())){
return $emi;
}
return Response::json( ['error' => 'Server is down']
,500);
}
/**
* Remove the specified resource from storage.
*
* @param int $id
* @return Response
*/
public function destroy($id)
{
//TODO delete emi balance change in loan
if(Emi::destroy($id))
return Response::json(array('msg'=>'Emi deleted'));
else
return Response::json(array('error'=>'Records not found'),400);
}
}
我在使用Model的事件系统时遇到了一些问题。有时它就是不工作，而且它的缺点是你不能把所有依赖的DB操作放在一个事务中。
虽然有点黑客，我认为插入/更新/删除相关模型最可靠的方法(如果你想确保DB关系完整性)是通过扩展save()和delete()方法，像这样:
class Model extends Eloquent {
$hasCustomInsert = false;
$hasCustomUpdate = false;
$hasCustomDelete = false;
public function __construct(array $attributes = [])
{
parent::__construct($attributes);
foreach(get_class_methods($this) as $method) {
if (in_array($method,['preInsert','postInsert'])) $this->hasCustomInsert = true;
if (in_array($method,['preEdit','postEdit'])) $this->hasCustomUpdate = true;
if (in_array($method,['preDelete','postDelete'])) $this->hasCustomDelete = true;
}
}
public function save(array $options = [])
{
//Custom Insert
if (!$this->exists && $this->hasCustomInsert) {
return DB::transaction(function() use($options) {
$this->preInsert();
$saved = parent::save($options);
$this->postInsert();
return $saved;
});
}
//Custom Update
if ($this->exists && $this->hasCustomUpdate) {
return DB::transaction(function() use($options) {
$this->preEdit();
$saved = parent::save($options);
$this->postEdit();
return $saved;
});
}
return parent::save($options);
}
public function delete()
{
//Custom Delete
if ($this->exists && $this->hasCustomDelete) {
return DB::transaction(function() {
$this->preDelete();
$deleted = parent::delete();
$this->postDelete();
return $deleted;
});
}
return parent::delete();
}
}
在扩展Eloquent的自定义基Model类上使用这个。所有的模型都应该从基类扩展，而不是直接扩展Eloquent。
然后，您可以在您的子模型的preInsert()， postInsert()， preEdit()， postEdit()， preDelete()和postDelete()方法中添加您想要的任何内容。如果子模型没有实现这些方法，save()和delete()会像往常一样调用Eloquent的方法。