Laravel保存了一对多的关系

时间:2015-01-07 20:55:22

标签: php laravel laravel-4 eloquent

我在Laravel中设置了以下关系:

OrderStatus Model
  - hasMany('Order')

 Order Model
  - 'belongsTo('OrderStatus');

使用orders表和order_statuses表设置数据库。 orders表格包含order_status_id字段。

当我保存订单时,我通过获取相应的订单状态模型手动设置order_status_id,如下所示:

$status = OrderStatus::where(['name'=>'sample_status'])->firstOrFail();
$order->order_status_id = $status->id;
$order->save();

我想知道是否有内置功能来执行此操作而不是手动设置order_status_id。我已经读过"附加相关模型"和"关联模型"在Laravel文档中,但我无法弄清楚这些是否适合我的用例。我认为我遇到的问题是我直接使用子模型(订单),并尝试设置它的父级。这有功能吗?

3 个答案:

答案 0 :(得分:21)

当然可以这样做:

$status = OrderStatus::where(['name'=>'sample_status'])->firstOrFail();
$order = new Order;
$order->status()->associate($status);
$order->save();

status()是belongsTo关系。您可能需要调整该名称)

答案 1 :(得分:10)

保存新相关模型的关系的正确方法如下:

$status = OrderStatus::where(['name'=>'sample_status'])->firstOrFail();
$order = new Order;
$status->order()->save($order);

文档链接:http://laravel.com/docs/4.2/eloquent#inserting-related-models

答案 2 :(得分:0)

您可以使用自定义解决方案。

我正在解释一个示例,该示例刚刚编码且与您的问题非常相似,希望对您有所帮助。 我有一个问题模型 AnswerOption模型,如下所示。

问题模型

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Question extends Model
{
    protected $table = 'questions';
    protected $fillable =  [
        'title',
        'created_at',
        'updated_at'            
    ];


    /**
     * Get the answer options for the question.
     */
    public function answerOptions()
    {
        return $this->hasMany('App\Models\AnswerOption');
    }


    /**
     * @param array $answerOptions
     */
    public function syncAnswerOptions(array $answerOptions)
    {
        $children = $this->answerOptions;
        $answerOptions = collect($answerOptions);        
        $deleted_ids = $children->filter(
            function ($child) use ($answerOptions) {
                return empty(
                    $answerOptions->where('id', $child->id)->first()
                );
            }
        )->map(function ($child) {
                $id = $child->id;
                $child->delete();                
                return $id;
            }
        );        
        $attachments = $answerOptions->filter(
            function ($answerOption) {
                 // Old entry (you can add your custom code here)
                return empty($answerOption['id']);
            }
        )->map(function ($answerOption) use ($deleted_ids) {
                // New entry (you can add your custom code here)           
                $answerOption['id'] = $deleted_ids->pop();                
                return new AnswerOption($answerOption);
        });        
        $this->answerOptions()->saveMany($attachments);
    }   
}

AnswerOption模型

namespace App\Models;
use Illuminate\Database\Eloquent\Model;

class AnswerOption extends Model
{
    protected $table = 'answer_options';

    protected $fillable =  [
        'question_id',
        'title',
        'ord',
        'created_at',
        'updated_at'            
    ];      

    /**
     * Get the question that owns the answer.
     */
    public function question()
    {
        return $this->belongsTo('App\Models\Question');
    }   
}

在这里您可以看到单个问题hasMany答案选项,可以看到我在模型中使用了BelongsTo和hasMany Relationip。

现在,在保存和更新问题期间,请在QuestionController中保存答案选项。

为此,我在问题模型中编写了 syncAnswerOptions 方法。

您只需要传递带有ID的选项数组,如果数据库中已经存在ID,则它将进行更新;如果ID为空,它将添加一条新记录;如果ID在其中,但不在您的新数组中,那么该记录将被删除。

/**
 * If you are attaching AnswerOption(s) for the first time, then pass
 * in just the array of attributes:
 * [
 *     [
 *         // answer option attributes...
 *     ],
 *     [
 *         // answer option attributes...
 *     ],
 * ]
 *//**
 * If you are attaching new AnswerOption(s) along with existing
 * options, then you need to pass the `id` attribute as well.
 * [
 *     [
 *         'id' => 24
 *     ],
 *     [
 *         // new answer option attributes...
 *     ],
 * ]
 */

在问题控制器的存储和更新方法中,在问题添加和更新调用之后立即调用此方法。

$question->syncAnswerOptions($data['answerOptions']);

$ data ['answerOptions']是答案选项数组,就像注释中所述。