Question

我有两个表，我想用外键响应数据。

TableCategory

public function up()
    {
        Schema::create('categories', function (Blueprint $table) {
            $table->increments('id',10);
            $table->string('name',100)->nullable();
            $table->timestamps();
        });
    }

TableSong

  public function up()
    {
        Schema::create('songs', function (Blueprint $table) {
            $table->increments('id',10);
            $table->string('name',100)->nullalbe();
            $table->string('url',500)->nullalbe();
            $table->integer('categories_id')->unsigned();
            $table->timestamps();

            $table->foreign('categories_id')->references('id')->on('categories');

        });
    }

CategoryModel

class CategoryModel extends Model
{
    protected $table = 'categories';
    protected $fillable = [
        'id',
        'name',
    ];
    public function song()
    {
        return $this->hasMany(SongModel::class);   
    }
}

SongModel

class SongModel extends Model
{
    protected $table = 'songs';
    protected $fillable = [
        'id',
        'name',
        'url',
        'categories_id',
        'singers_id',
        'types_id',
    ];

    public function category()
    {
        return $this->belongsTo(CategoryModel::class, 'categories_id');
    }
}

CategorySongController

class CategorySongController extends Controller
{

    public function index(CategoryModel $categoryModel)
    {
        $song = $categoryModel->song;
        return response()->json(['Data' => $song]);
    }

}

错误

SQLSTATE [42S22]：找不到列：1054未知列＆＃39; songs.category_model_id＆＃39;在＆＃39; where子句＆＃39; （SQL：select * from songs songs category_model_id。songs为空 category_model_id。24h_volume_usd不为空）

我的路线

路由::资源（＆＃39; / api / v1 / categories＆＃39;，＆＃39; CategoryController＆＃39;，[＆＃39; only＆＃39; =＆gt; [＆＃39; index＆＃39;，＆＃39; show＆＃39;，]]）;路线::资源（＆＃39; /api/v1/categories.songs' ;, ＆＃39; CategorySongController＆＃39;，[＆＃39; only＆＃39; =＆GT; [＆＃39;指数＆＃39;]]）;

Answer 1

问题出在song模型中的CategoryModel关系中，您当前的方法会尝试在category_model_id表中找到songs，因为您没有提供任何外键在你们的关系中

使用返回return $this->hasMany(SongModel::class);替换$this->hasMany(SongModel::class,'categories_id');以修复错误

Answer 2

尝试将CategoryModel中方法signature': b'<signature'>的名称更改为复数'signature': signature_b64.decode('utf-8')。

Laravel 5.4 - 如何使用外键响应JSON数据？

2 个答案: