Question

我正在尝试使用laravel中两个数据库中的数据。编辑：我已将产品控制器添加到此帖的底部

这是我测试它们是否被链接的方式：

<p>TEST :{{ $products->ticket->created_at}}</p>

错误消息：

未定义变量：产品（查看：/Applications/MAMP/htdocs/lsapp/resources/views/products/create.blade.php）

Product.php（App）

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
    //Table NAME
    protected $table = 'products';

    //PRIMARY KEY
    public $primaryKey = 'id';

    //Timestamps
    public $timestamps =true;

    public function user(){
        return $this->belongsTo('App\User');
    }

    public function products()
    {
        return $this->hasMany(App\product::class);
    }
}

Ticket.php（app）

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class product extends Model
{
    public function Product(){
        return $this->belongsTo(App\Product::class);
    }
}

产品总监：

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\product;
use App\Ticket;

class productController extends Controller
{
        /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('auth',['except' => ['index','show']]);
    }

    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $products = product::orderBy('created_at','desc')->paginate(10);
        //$products = product::where('type','major')->get();
        return view('products.index')->with('products',$products);
    } 

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

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $this->validate($request,[
            'title' => 'required',
        ]);
            //create product
        $product = new product;
        $product->title = $request->input('title');
        $product->venue = $request->input('venue');
        $product->city = $request->input('city');
        $product->country = $request->input('country');
        $product->description = $request->input('description');
        $product->date = $request->input('date');
        $product->user_id = auth()->user()->id;
        $product->save();

        return redirect('/products')->with('success','product Created');
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        $product = product::find($id);
        return view('products.show')->with('product',$product);
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        $product = product::find($id);

        if(auth()->user()->id !==$product->user_id){
            return redirect('/products')->with('error','unauthorised page');
        }

        return view('products.edit')->with('product',$product);
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        $this->validate($request, [
            'title' => 'required'
        ]);

        $product = product::find($id);
        $product->title = $request->input('title');
        $product->venue = $request->input('venue');
        $product->city = $request->input('city');
        $product->country = $request->input('country');
        $product->description = $request->input('description');
        $product->date = $request->input('date');
        $product->user_id = auth()->user()->id;
        $product->save();

        return redirect('/products')->with('success','product updated');
    }


    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        $product = product::find($id);
        if(auth()->user()->id !==$product->user_id){
            return redirect('/products')->with('error','unauthorised page');
        }

        $product->delete();
        return redirect('/products')->with('success','product deleted');

    }
}

Answer 1

您的代码存在一些问题。

<p>TEST :{{ $products->ticket->created_at}}</p>永远不会奏效。假设您正在索引页面中进行测试，则需要遍历每个产品以查看它与故障单的关系。您的所有产品都有一张票吗？如果是这样，那么您可以在配置变量中定义单个票证。在数据库中定义多对一关系是没有意义的。

在Product模型中，您尚未定义与Ticket模型的关系。您只在Ticket模型中为Product模型定义了关系。这意味着您可以从product访问ticket，但不能相反。您需要明确定义从Product到Ticket的一对一关系才能使用它。

您已在产品型号中定义了此功能。

public function products() {

    return $this->hasMany(App\product::class);
}

为什么呢？产品本身有很多产品吗？我想你可以从学习雄辩的关系中受益。 Laracasts是从头开始学习Laravel的好资源。另请参阅Laravel official Eloquent documentation

未在laravel中使用hasMany链接的数据库

1 个答案: