如何让页面显示 Nova 中的所有关系

Question

如何让一个资源视图在查看所有资源页面中显示所有关系的数据（并且希望仍然可以排序和搜索）？

例如，我有 2 个表：

供应商 - id、供应商名称 产品 - id、product_name、年份

我想要一个视图来显示表格：

供应商 ID |供应商名称 |产品编号 |产品名称 |年份

目前，我有一个供应商页面和一个产品页面。我想将结果合二为一。

Answer 1

针对你的表结构和你的需求，我推荐这个解决方案：

// database\migrations\2019_10_04_153155_create_vendors_table.php
        Schema::create('vendors', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name',100);
            $table->timestamps();
        });
// database\migrations\2019_10_04_153325_create_products_table.php
        Schema::create('products', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name',100);
            $table->integer('year');
            $table->timestamps();
        });
// database\migrations\2019_10_04_154713_create_product_vendor_table.php
        Schema::create('product_vendor', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->bigInteger('product_id');
            $table->bigInteger('vendor_id');
            $table->timestamps();
        });
// app\Product.php
class Product extends Model
{
    public function vendors()
    {
        return $this->belongsToMany(Vendor::class,'product_vendor');
    }
}
// app\Vendor.php
class Vendor extends Model
{
    public function products()
    {
        return $this->belongsToMany(Product::class,'product_vendor');
    }
}
// app\ProductVendor.php
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use \App\Product;
use \App\Vendor;
class ProductVendor extends Model
{
    protected $table = 'product_vendor';
    public function GetColumnProductNameAttribute()
    {
        if($this->product_id){
            return Product::find($this->product_id)->name;
        }else{
            return '';
        }
    }
    public function GetColumnVendorNameAttribute()
    {
        if($this->vendor_id){
            return Vendor::find($this->vendor_id)->name;
        }else{
            return '';
        }
    }
    public function GetColumnProductYearAttribute()
    {
        if($this->product_id){
            return Product::find($this->product_id)->year;
        }else{
            return '';
        }
    }
}
// app\Nova\Product.php
    public static $title = 'name';
// app\Nova\Vendor.php
    public static $title = 'name';
// app\Nova\ProductVendor.php
<?php
namespace App\Nova;
use Laravel\Nova\Fields\ID;
use Laravel\Nova\Fields\Text;
use Laravel\Nova\Fields\Number;
use Illuminate\Http\Request;
use Laravel\Nova\Http\Requests\NovaRequest;
class ProductVendor extends Resource
{
    public static $model = 'App\ProductVendor';
    public static $title = 'id';
    public static function indexQuery(NovaRequest $request, $query)
    {
        return $query->join('vendors', 'product_vendor.vendor_id', '=', 'vendors.id')
        ->join('products', 'product_vendor.product_id', '=', 'products.id')
        ->select('vendors.name as column_vendor_name','products.name as column_product_name','products.year as column_product_year','product_vendor.*','products.*','vendors.*');
    }
    public static $search = [
        'id','products.name','vendors.name'
    ];
    public function fields(Request $request)
    {
        return [
            ID::make()->sortable(),
            ID::make('Vendor Id','vendor_id')
                ->sortable(),
            Text::make('Vendor Name','column_vendor_name')
                ->sortable()
                ->hideWhenCreating(),
            ID::make('Product Id','product_id')
                ->sortable(),
            Text::make('Product Name','column_product_name')
                ->sortable()
                ->hideWhenCreating(),
            Text::make('Product Year','column_product_year')
                ->sortable()

        ];
    }
    public function cards(Request $request)
    {
        return [];
    }
    public function filters(Request $request)
    {
        return [];
    }
    public function lenses(Request $request)
    {
        return [];
    }
    public function actions(Request $request)
    {
        return [];
    }
}

主要思想是显示数据透视表 product_vendor 与 2 个表连接：产品和供应商。然后通过一些基本的命令设置，您将能够搜索产品名称、供应商名称（或更多）和可排序（全部）。祝你好运，如果你需要，问我！

更新：

为了修复可排序和搜索 id 的错误，需要在 ProductVendor Nova 中进行一些更改：

// indexQuery:
    public static function indexQuery(NovaRequest $request, $query)
    {
        return $query->join('vendors', 'product_vendor.vendor_id', '=', 'vendors.id')
        ->join('products', 'product_vendor.product_id', '=', 'products.id')
        ->select('product_vendor.id as temp_id','products.id as temp_product_id','vendors.id as temp_vendor_id','vendors.name as column_vendor_name','products.name as column_product_name','products.year as column_product_year','product_vendor.*','products.*','vendors.*');
    }
// $search
    public static $search = [
        'product_vendor.id','products.name','vendors.name'
    ];
// fields function
    public function fields(Request $request)
    {
        return [
            ID::make('ID','temp_id')->sortable(),
            ID::make('Vendor Id','vendor_id')
                ->sortable(),
            Text::make('Vendor Name','column_vendor_name')
                ->sortable()
                ->hideWhenCreating(),
            ID::make('Product Id','product_id')
                ->sortable(),
            Text::make('Product Name','column_product_name')
                ->sortable()
                ->hideWhenCreating(),
            Text::make('Product Year','column_product_year')
                ->sortable()

        ];
    }