Eloquent 不从关系中添加外键

Question

我找不到问题的答案，希望我能正确描述。我希望能够提供所有必要的信息。

底线：为什么在通过父模型创建新数据库条目时没有注入关系父 ID。

我有一个 Occasions 模型，其中包含一组图片。在 addPicture ($name, $filepath) 方法中抛出异常。正如代码注释所指出的

Occasion.php

// namespace + use directives omitted
class Occasion extends Model
{
    use Sluggable;
    protected $fillable = [ 'name', 'root-folder', 'path' ];

    public function sluggable ()
    {
        return [
            'slug' => [
                'source' => [ 'root-folder', 'name', ],
            ],
        ];
    }

    public function pictures ()
    {
        return $this->hasMany(picture::class);
    }
    public function addPicture ($name, $filepath)
    {
        $thumbname = $this->getThumbFilename($filepath);
        dump($this,$this->pictures()); // dump to check my data
        $pic = Picture::create(compact('name', 'thumbname'));
        // this line is never reached
        $pic->createThumb($filepath);
    }
    ...
}

Picture.php:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Spatie\Glide\GlideImage;

class Picture extends Model
{
    protected $fillable = [ 'name', 'thumbname' ];

    public function createThumb ($filepath)
    {
        $this->ppath = storage_path('app') . "/" . $filepath;
        $this->tpath = storage_path('app/public/thumbs') . "/" . $this->getfilename($filepath);
        GlideImage::create($this->ppath)->modify([ 'w' => 100, 'h' => 100, 'fit' => 'max' ])->save($this->tpath);
        $this->save();
    }

    public function occasion ()
    {
        return $this->belongsTo(Occasion::class);
    }

/*    public function slideshow ()
    {
        return $this->belongsToMany(Slideshow::class);
    }*/

    private function getfilename ($path)
    {
        $tmp = array_slice(explode('/', $path), -3);

        return str_replace(" ", "-", implode("-", $tmp));
    }
}

dump($this->pictures()); 的结果显示了关系和使用的列：

HasMany {#206 ▼
  #foreignKey: "pictures.occasion_id"
  #localKey: "id"
  #query: Builder {#205 ▶}
  #parent: Occasion {#215 ▶}
  #related: Picture {#210 ▶}
}

但是我收到一条错误消息，告诉我我的 occasion_id（在图片中 table）缺少默认值。查看构建的查询 occasion_id 确实丢失了。我不明白的是为什么在我通过场合对象创建新图片实例时没有注入所述 ID。

QueryException

SQLSTATE[HY000]: General error: 1364 Field 'occasion_id' doesn't have a default value (SQL: insert into `pictures` (`name`, `thumbname`, `updated_at`, `created_at`) values (IMG_0015.JPG, 2006-PVanlage-06-IMG_0015.JPG, 2017-09-12 19:34:07, 2017-09-12 19:34:07))

我希望提供所有必要的信息。

Answer 1

首先，您需要将 "occasion_id" 添加到 App\Picture 模型中的可填充数组。其次，需要先创建occasion对象，然后传入ID addPicture创建图片对象，见下文

public Picture extends Model{
  public $fillable = ['name', 'filepath', 'occasion_id'];

  public function occasion(){
      $this->belongsTo(App\Occassion::class);
    }
}

public function addPicture ($name, $filepath, $occasion_id)
{
    $thumbname = $this->getThumbFilename($filepath);
    dump($this,$this->pictures()); // dump to check my data
    $pic = Picture::create(compact('name', 'thumbname', 'occasion_id'));
    // this line is never reached
    $pic->createThumb($filepath);
}

有一种更聪明的方法可以做到这一点，但这应该可行。

Eloquent 不从关系中添加外键

Eloquent does not add foreign key from relation

eloquent

laravel-5

laravel-eloquent

laravel-5.4