拉拉维尔保存一对多关系


Laravel save one to many relationship

我在Laravel中建立了以下关系:

OrderStatus Model
  - hasMany('Order')
 Order Model
  - 'belongsTo('OrderStatus');

数据库设置了一个orders表和一个order_statuses表。orders表有一个用于order_status_id的字段。

保存订单时,我通过获取适当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函数可以执行此操作,而不是手动设置order_status_id。我已经在Laravel文档中阅读了"附加相关模型"和"关联模型",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),并尝试设置它的父模型。有这个功能吗?

当然你可以这样做:

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

status()是属于关系。您可能需要调整该名称)

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

您可以使用自定义解决方案。

我正在解释一个例子,刚刚编码并且与您的问题非常相似,希望它会有所帮助。我有一个问题模型和答案选项模型,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);
    }   
}

答案选项模型

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');
    }   
}

在这里你可以看到一个问题有很多答案选项,你可以看到我用过属于,有很多关系在模型中。

现在,在问题保存

和更新期间,在问题控制器中,您还可以保存答案选项。

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id已经存在于数据库中,那么它将更新,如果id为空,它将添加一个新记录,如果id在那里但不在新数组中,则该记录将被删除。

/**
 * 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,就像注释中所述一样。