php - 如何获取正在电影院播放的所有电影？

Question

我有以下 Eloquent 实体:

• 电影
• 电影 session
• 电影院
• 电影院

表结构:

Schema::create('movies', function (Blueprint $table) {
    $table->increments('id');
});

Schema::create('movie_theaters', function (Blueprint $table) {
    $table->increments('id');
    $table->string('name')->index();
    $table->string('slug')->index()->unique();
    $table->string('description')->index()->nullable();
    $table->longText('content')->nullable();

    $table->unsignedInteger('picture_id')->nullable();
    $table->foreign('picture_id')
         ->references('id')
         ->on('media');

    $table->boolean('activated')->default(true);

    $table->timestamps();
});

Schema::create('movie_theater_rooms', function (Blueprint $table) {
    $table->increments('id');
    $table->string('name')->index();
    $table->string('description')->index()->nullable();
    $table->longText('content')->nullable();

    $table->boolean('activated')->default(true);

    $table->unsignedInteger('movie_theater_id');
    $table->foreign('movie_theater_id')
        ->references('id')
        ->on('movie_theaters')
        ->onDelete('cascade');

    $table->unsignedInteger('picture_id')->nullable();
    $table->foreign('picture_id')
        ->references('id')
        ->on('media');

    $table->timestamps();
});

Schema::create('movie_sessions', function (Blueprint $table) {
    $table->increments('id');

    $table->dateTime('starts_in');
    $table->dateTime('ends_in');

    $table->unsignedInteger('movie_theater_room_id');
    $table->foreign('movie_theater_room_id')
        ->references('id')
        ->on('movie_theater_rooms')
        ->onDelete('cascade');

    $table->unsignedInteger('movie_id');
    $table->foreign('movie_id')
        ->references('id')
        ->on('movies')
        ->onDelete('cascade');

    $table->boolean('activated')->default(true);

    $table->timestamps();
});

其中一个 MovieTheater 有许多 MovieTheaterRoom，每个 MovieTheaterRoom 有许多 MovieSession 并且每个 MovieSession 属于电影。

我正在尝试的是通过 $movieTheaterId 获取今天在 MovieTheater 上播放的所有 Movie，但是由于这是一个长期的关系，我无法检索这样的集合。

这是我试过的:

public function scopeGetMoviesShowingTodayOnMovieTheater($movieTheaterId)
{
    return Movie::whereHas('sessions', function ($query) use ($movieTheaterId) {
        // $query->whereDate('starts_in', Carbon::today());

        $query->whereHas('movieTheaterRoom', function ($query) use ($movieTheaterId) {
            $query->where('movie_theater_id', $movieTheaterId);
        });
    });
}

当调用 App\Models\Movie::getMoviesShowingTodayOnMovieTheater(1)->get() 时，这是我得到的:

PHP Recoverable fatal error: Object of class Illuminate/Database/Eloquent/Builder could not be converted to string in .../vendor/illuminate/support/Str.php on line 338

我也试过像这样使用这个包staudenmeir/eloquent-has-many-deep:

class MovieTheater extends Model {
    use HasRelationships;

    public function movies()
    {
        return $this->hasManyDeep(Movie::class, [MovieSession::class, MovieTheaterRoom::class]);
    }
}

并且在调用 App\Models\MovieTheater::find(1)->movies()->get() 时

这是输出:

Illuminate/Database/QueryException with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'movie_sessions.movie_theater_id' in 'field list' (SQL: select movies.*, movie_sessions.movie_theater_id from movies inner join movie_theater_rooms on movie_theater_rooms.id = movies.movie_theater_room_id inner join movie_sessions on movie_sessions.id = movie_theater_rooms.movie_session_id where movie_sessions.movie_theater_id = 1)'

我哪里错了？

Answer 1

异常

Object of class Illuminate/Database/Eloquent/Builder could not be converted to string in .../vendor/illuminate/support/Str.php on line 338

被抛出是因为您没有在范围定义中提供 $query 参数。您的代码将尝试将电影院 ID 转换为 Builder 实例，但失败了。

尝试将您的代码重构为:

/**
 * Scope a query to only select movies that are showing in a certain theater.
 *
 * @param  \Illuminate\Database\Eloquent\Builder  $query
 * @param  int  $movieTheaterId
 * @return \Illuminate\Database\Eloquent\Builder
 */
public function scopeGetMoviesShowingTodayOnMovieTheater($query, $movieTheaterId)
{
    return $query
        ->whereHas('sessions.movieTheaterRoom', function ($query) use 
        ($movieTheaterId) {
            $query->whereMovieTheaterId($movieTheaterId);
        });
}

我还在 whereHas 语句中添加了点符号来查询嵌套关系。