Laravel Eloquent 存储多对多关系

Question

我有 3 张桌子

-- networks
    Schema::create('networks', function(Blueprint $table)
        {
            $table->engine = 'InnoDB';

            $table->increments('id');
            $table->string('network');
            $table->string('description',255);
            $table->string('attributes',255);
            $table->timestamps();

        });

和

-- campaigns

 Schema::create('campaigns', function($table) {
                $table->engine = 'InnoDB';
                $table->increments('id');
                $table->string('campaign_title');
                $table->integer('owner')->unsigned();
                $table->string('details');
                $table->timestamps();
            });

            Schema::table('campaigns', function($table) {
                $table->foreign('owner')->references('id')->on('users')->onDelete('cascade');
            });

和 --campaign_networks_relationhsips

Schema::table('campaign_networks_relationhsips', function($table)
    {
        $table->foreign('campaign_id')->references('id')->on('campaigns')->onDelete('cascade');
        $table->foreign('network_id')->references('id')->on('networks')->onDelete('cascade');
    });

在创建新的广告系列时，在表单中，我将可用的网络显示为复选框。

用户为广告系列命名，并向其投放所需的网络并保存。

问题：

有一个 Eloquent 方法可以将这种关系直接拉到绑定表（campaign_networks_relationhsips），或者我必须进行 2 个查询，比如保存活动，并且在获取活动的 id 后，我在网络上使用循环来保存这个关系我的绑定表。

例子

创建的广告系列：返回 id:1 选择的网络 3,4

然后循环并保存

1-3
1-4 

in campaign_networks_relationhsips

比我尝试以下方法

<?php namespace Td\Reports\Controllers\Backend;

use Td\Reports\Campaigns\CampaignsInterface;
use Input,
    Redirect,
    View,
    App,
    Str;
use Illuminate\Support\MessageBag;
class CampaignsController extends ObjectBaseAdminController {

    /**
     * The place to find the views / URL keys for this controller
     * @var string
     */
    protected $view_key = 'admin.campaigns';

    protected $networks;

    /**
     * Construct
     */
    public function __construct(CampaignsInterface $campaigns) {
        $this->model = $campaigns;
        $networks = App::make('Td\Reports\Networks\NetworksInterface');
        $this->networks = $networks->getAll();
        parent::__construct();
    }

   public function postNew() {


        $record = $this->model->getNew(Input::all());
        //$record->campaign_title= Input::get('campaign_title');

        $valid = $this->validateWithInput === true ? $record->isValid(Input::all()) : $record->isValid();

        if (!$valid)
            return Redirect::to('admin/' . $this->new_url)->with('errors', $record->getErrors())->withInput();

        // Run the hydration method that populates anything else that is required / runs any other
        // model interactions and save it.
        $record->save();

        $record->networks()->sync([3,4]);

        return Redirect::to($this->object_url)->with('success', new MessageBag(array('Item Created')));
    }


}

比我有广告系列的存储库

<?php

namespace Td\Reports\Campaigns;

use Td\Reports\Core\EloquentBaseRepository;
use Td\Reports\Abstracts\Traits\NetworkableRepository;
use Datatables,Sentry;

class CampaignsRepository extends EloquentBaseRepository implements CampaignsInterface {


    /**
     * Construct
     * @param Campaigns $campaigns
     */
    public function __construct(Campaigns $campaigns) {
        $this->model = $campaigns;


    public function getAll() {

        if (Sentry::getUser()->hasAnyAccess(['system'])) {
            return $this->model->get();
        } else {
            return $this->model->where('owner', Sentry::getUser()->id)->get();
        }
    }

    public function networks()
    {
        return $this->belongsToMany('Network', 'campaign_networks_relationhsips');
    }

}

Answer 1

必读：http://laravel.com/docs/eloquent#relationships

根据您所写的内容，我假设您要保存模型及其枢轴关系，因此如下：

// basic example flow in a controller, repo or wherever you like
$campaign = new Campaign;
$campaign->name = Input::get('name');
// assign more campaign attributes
$campaign->save();

$campaign->networks()->sync([3,4]); // 3,4 are existing network rows ids

就是这样。要使上述方法起作用，您需要设置这些关系：

// Campaign model
public function networks()
{
  return $this->belongsToMany('Network', 'campaign_networks_relationhsips');
}

// Network model
public function campaings()
{
  return $this->belongsToMany('Campaign', 'campaign_networks_relationhsips');
}