在Laravel 5.3中創建相關模型實例時出錯

Question

我剛剛開始使用基於Laravel的項目，並且在創建與另一個模型實例相關的模型實例時遇到問題。總之，我有一個「公司」模型類，它引用「公司」MySQL表，還有一個引用「位置」表的「位置」模型類。兩個表格都是相關的（公司有許多地點，每個地點都屬於公司）。到現在爲止還挺好。

我有一個「中間件」機制檢查是否存在至少一家公司，如果沒有公司，我假設這是第一次運行系統，所以我顯示「創建公司」控制器/操作用戶創建第一家公司。在提交時，這也會創建一個使用相同公司信息的單個位置記錄，因此最終數據庫中的位置記錄應該將「company_id」作爲剛剛創建的公司記錄的ID，但這不會發生 。

讓我顯示關於這個問題的現有文件和類：

遷移文件來創建企業表：

<?php 

use Illuminate\Database\Migrations\Migration; 
use Illuminate\Database\Schema\Blueprint; 
use Illuminate\Support\Facades\Schema; 

class CreateCompaniesTable extends Migration { 
    /** 
    * Run the migrations. 
    * 
    * @return void 
    */ 
    public function up() { 
     Schema::create('companies', function (Blueprint $table) { 
      $table->increments('id'); 
      $table->string('nit'); 
      $table->string('name'); 
      $table->string('contact_name')->nullable(); 
      $table->string('address')->nullable(); 
      $table->string('phone')->nullable(); 
      $table->string('email')->nullable(); 
      $table->string('website')->nullable(); 
      $table->timestamps(); 
      $table->softDeletes(); 
      $table->integer('created_by')->unsigned()->nullable(); 
      $table->integer('updated_by')->unsigned()->nullable(); 
      $table->integer('deleted_by')->unsigned()->nullable(); 

      $table->foreign('created_by')->references('id')->on('users') 
       ->onDelete('cascade'); 
      $table->foreign('updated_by')->references('id')->on('users') 
       ->onDelete('cascade'); 
      $table->foreign('deleted_by')->references('id')->on('users') 
       ->onDelete('cascade'); 

      $table->index('nit'); 
      $table->index('name'); 
      $table->index('created_at'); 
      $table->index('deleted_at'); 
     }); 
    } 

    /** 
    * Reverse the migrations. 
    * 
    * @return void 
    */ 
    public function down() { 
     Schema::dropIfExists('companies'); 
    } 
} 

遷移文件創建的位置表：

<?php 

use Illuminate\Database\Migrations\Migration; 
use Illuminate\Database\Schema\Blueprint; 
use Illuminate\Support\Facades\Schema; 

class CreateLocationsTable extends Migration { 
    /** 
    * Run the migrations. 
    * 
    * @return void 
    */ 
    public function up() { 
     Schema::create('locations', function (Blueprint $table) { 
      $table->increments('id'); 
      $table->integer('company_id')->unsigned()->nullable(); 
      $table->string('nit'); 
      $table->string('name'); 
      $table->string('contact_name')->nullable(); 
      $table->string('address')->nullable(); 
      $table->string('phone')->nullable(); 
      $table->string('email')->nullable(); 
      $table->string('website')->nullable(); 
      $table->timestamps(); 
      $table->softDeletes(); 
      $table->integer('created_by')->unsigned()->nullable(); 
      $table->integer('updated_by')->unsigned()->nullable(); 
      $table->integer('deleted_by')->unsigned()->nullable(); 

      $table->foreign('created_by')->references('id')->on('users') 
       ->onDelete('cascade'); 
      $table->foreign('updated_by')->references('id')->on('users') 
       ->onDelete('cascade'); 
      $table->foreign('deleted_by')->references('id')->on('users') 
       ->onDelete('cascade'); 

      $table->foreign('company_id')->references('id')->on('companies') 
       ->onDelete('cascade'); 

      $table->index('nit'); 
      $table->index('name'); 
      $table->index('created_at'); 
      $table->index('deleted_at'); 
     }); 
    } 

    /** 
    * Reverse the migrations. 
    * 
    * @return void 
    */ 
    public function down() { 
     Schema::dropIfExists('locations'); 
    } 
} 

公司模型類

<?php 

namespace App; 

use Illuminate\Database\Eloquent\Model; 
use Illuminate\Database\Eloquent\SoftDeletes; 

/** 
* App\Company 
*/ 
class Company extends Model { 
    use SoftDeletes; 

    /** 
    * The attributes that are mass assignable. 
    * 
    * @var array 
    */ 
    protected $fillable = [ 
     'nit', 'name', 'contact_name', 'address', 'phone', 'email', 'website', 
    ]; 

    /** 
    * The attributes that should be mutated to dates. 
    * 
    * @var array 
    */ 
    protected $dates = ['deleted_at']; 

    /** 
    * Get the users for the company. 
    */ 
    public function users() { 
     return $this->hasMany(User::class); 
    } 

    /** 
    * Get the locations for the company. 
    */ 
    public function locations() { 
     return $this->hasMany(Location::class); 
    } 

    /** 
    * Get the invoices for the company. 
    */ 
    public function invoices() { 
     return $this->hasMany(Invoice::class); 
    } 

    /** 
    * Get the user that created the record. 
    */ 
    public function createdBy() { 
     return $this->belongsTo(User::class, 'created_by'); 
    } 

    /** 
    * Get the last user that updated the record. 
    */ 
    public function updatedBy() { 
     return $this->belongsTo(User::class, 'updated_by'); 
    } 

    /** 
    * Get the user that removed the record. 
    */ 
    public function deletedBy() { 
     return $this->belongsTo(User::class, 'deleted_by'); 
    } 

    /** 
    * Scope a query to only include the first active company. 
    * 
    * @param \Illuminate\Database\Eloquent\Builder $query 
    * @return \Illuminate\Database\Eloquent\Builder 
    */ 
    public function active($query) { 
     return $query->orderBy('id')->limit(1); 
    } 
} 

的選址模型類：

<?php 

namespace App; 

use Illuminate\Database\Eloquent\Model; 
use Illuminate\Database\Eloquent\SoftDeletes; 

/** 
* App\Location 
*/ 
class Location extends Model { 
    use SoftDeletes; 

    /** 
    * The attributes that are mass assignable. 
    * 
    * @var array 
    */ 
    protected $fillable = [ 
     'nit', 'name', 'contact_name', 'address', 'phone', 'email', 'website', 'company_id', 
    ]; 

    /** 
    * The attributes that should be mutated to dates. 
    * 
    * @var array 
    */ 
    protected $dates = ['deleted_at']; 

    /** 
    * Get the company that owns the location. 
    */ 
    public function company() { 
     return $this->belongsTo(Company::class); 
    } 

    /** 
    * Get the products for the location. 
    */ 
    public function products() { 
     return $this->hasMany(Product::class); 
    } 

    /** 
    * Get the inventory records for the location. 
    */ 
    public function inventories() { 
     return $this->hasMany(Inventory::class); 
    } 

    /** 
    * Get the user that created the record. 
    */ 
    public function createdBy() { 
     return $this->belongsTo(User::class, 'created_by'); 
    } 

    /** 
    * Get the last user that updated the record. 
    */ 
    public function updatedBy() { 
     return $this->belongsTo(User::class, 'updated_by'); 
    } 

    /** 
    * Get the user that removed the record. 
    */ 
    public function deletedBy() { 
     return $this->belongsTo(User::class, 'deleted_by'); 
    } 
} 

所提到的中間件檢測系統的首次運行：

<?php 

namespace App\Http\Middleware; 

use App\Company; 
use Closure; 

class CheckSystemFirstRun { 
    /** 
    * Handle an incoming request. 
    * 
    * @param \Illuminate\Http\Request $request 
    * @param \Closure     $next 
    * @return mixed 
    */ 
    public function handle($request, Closure $next) { 

     /** @var \Illuminate\Http\Response $response */ 
     $response = $next($request); 

     // The verification must be done AFTER the response has been generated, otherwise the request's route is 
     // unknown. 
     if ($request->route()->getName() != 'company.create') { 

      // Check if there are no active companies. 
      if (Company::count() == 0) { 
       return redirect(route('company.create')); 
      } 
     } else { 

      // Check if there are active companies. 
      if (Company::count() > 0) { 
       return redirect(route('dashboard')); 
      } 
     } 

     return $response; 
    } 
} 

的CompanyController類這允許用戶輸入第一個公司和位​​置記錄：

<?php 

namespace App\Http\Controllers; 

use App\Company; 
use App\Http\Requests\AddCompanyRequest; 
use Illuminate\Http\Request; 

class CompanyController extends Controller { 


    /** 
    * Show the form for creating a new resource. 
    * 
    * @return \Illuminate\Http\Response 
    */ 
    public function create() { 
     return view('company.create'); 
    } 

    /** 
    * Store a newly created resource in storage. 
    * 
    * @param AddCompanyRequest $request 
    * @param Company   $company 
    * @return \Illuminate\Http\Response 
    */ 
    public function store(AddCompanyRequest $request, Company $company) { 
     $company->create($request->all()); 

     // If there are no locations, create one using the same data as the received to create the company. 
     if ($company->locations->count() == 0) { 
      $company->locations()->create($request->all()); 
     } 

     return redirect()->route('company.create'); 
    } 
} 

也包含了公司創建驗證指定的請求類：

<?php 

namespace App\Http\Requests; 

use Illuminate\Foundation\Http\FormRequest; 

class AddCompanyRequest extends FormRequest { 
    /** 
    * Determine if the user is authorized to make this request. 
    * 
    * @return bool 
    */ 
    public function authorize() { 
     return true; 
    } 

    /** 
    * Get the validation rules that apply to the request. 
    * 
    * @return array 
    */ 
    public function rules() { 
     return [ 
      'nit'  => 'required|max:255', 
      'name' => 'required|max:255', 
      'email' => 'required|email|unique:companies|max:255', 
      'website' => 'url|max:255', 
     ]; 
    } 

} 

當數據庫是全新的，我運行系統，我重定向到「創建公司」行動。在提交新公司記錄時創建成功，但預期的位置記錄是在沒有與公司記錄（company_id外鍵列保持NULL）的預期關係的情況下創建的。

我下面the recommendation from Laravel 5.3所以我不知道什麼是錯我的代碼。

在發佈此問題之前，我發現locations表中的company_id字段可能需要在遷移中定義爲可空;它之前不是這樣，但是當時Laravel/PHP迴應了MySQL的完整性錯誤，因爲「company_id」字段不能爲空。我也嘗試dd（）用於在新記錄上定義company_id的參數，但返回id值的函數總是返回null。另外，我曾嘗試：

$company->locations()->create($request->all()); 

和

$location = new Location($request->all()); 
$company->locations()->save($location); 

都沒有成功。

我正在使用MySQL Ver 15.1 Distrib 10.1.10-MariaDB，用於Windows 10 x64，PHP 7.0.4上的Win32（AMD64）。

任何幫助，高度讚賞。謝謝。

---

更新01

這裏是執行的查詢的輸出時執行的操作：

---------------------- 
Query: insert into `companies` (`nit`, `name`, `contact_name`, `address`, `phone`, `email`, `website`, `updated_at`, `created_at`) values (?, ?, ?, ?, ?, ?, ?, ?, ?) 
Bindings: array (
    0 => '1113332323-9', 
    1 => 'TEST COMPANY INC', 
    2 => 'JOHN DOE', 
    3 => '1362 36TH PL', 
    4 => '8889990099', 
    5 => 'test@test.com', 
    6 => 'http://test.com', 
    7 => '2017-01-16 00:16:25', 
    8 => '2017-01-16 00:16:25', 
) 
Time: 4.5099999999999998 

---------------------- 
Query: select * from `locations` where `locations`.`company_id` is null and `locations`.`company_id` is not null and `locations`.`deleted_at` is null 
Bindings: array (
) 
Time: 0.48999999999999999 

---------------------- 
Query: insert into `locations` (`nit`, `name`, `contact_name`, `address`, `phone`, `email`, `website`, `company_id`, `updated_at`, `created_at`) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) 
Bindings: array (
    0 => '1113332323-9', 
    1 => 'TEST COMPANY INC', 
    2 => 'JOHN DOE', 
    3 => '1362 36TH PL', 
    4 => '8889990099', 
    5 => 'test@test.com', 
    6 => 'http://test.com', 
    7 => NULL, 
    8 => '2017-01-16 00:16:25', 
    9 => '2017-01-16 00:16:25', 
) 
Time: 4.5300000000000002 

Answer 1

您要添加的位置的Company你的ORM實例上不新創建的記錄。

$company->create($request->all()); 

應該

$company = $company->create($request->all());