<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model as EloquentModel;

class Model extends EloquentModel
{
  protected $suffix = null;

  // 設(shè)置表后綴
  public function setSuffix($suffix)
  {
    $this->suffix = $suffix;
    if ($suffix !== null) {
      $this->table = $this->getTable() . '_' . $suffix;
    }
  }

  // 提供一個(gè)靜態(tài)方法設(shè)置表后綴
  public static function suffix($suffix)
  {
    $instance = new static;
    $instance->setSuffix($suffix);

    return $instance->newQuery();
  }

  // 創(chuàng)建新的"chapters_{$suffix}"的模型實(shí)例并返回
  public function newInstance($attributes = [], $exists = false)
  {
    $model = parent::newInstance($attributes, $exists);
    $model->setSuffix($this->suffix);

    return $model;
  }
}

<?php

namespace App\Http\Controllers;

use App\Models\{Book, Chapter};

class ChaptersController extends Controller
{
  public function chapter (Book $book)
  {
    // 章節(jié)列表（普通查詢(xún)）
    $list = Chapter::lists($book->id);

    // 章節(jié)列表（使用模型關(guān)聯(lián)）
    $list = $book->chapters()->oldest('id')->get();
  }
}

<?php

namespace App\Models;

class Chapter extends Model
{
  public static function lists ($bookId)
  {
    $suffix = $bookId % 10;
    /*
    * 例如 $sufiix = 1; 我要要獲取的就是：chapters_1的模型實(shí)例
    * 使用Model類(lèi)中提供的靜態(tài)方法創(chuàng)建該表的模型實(shí)例
    * 返回指定書(shū)籍的章節(jié)
    */
    return self::suffix($suffix)->where('book_id', $bookId)->get();
  }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\HasMany;

class Book extends Model
{
  public function chapters ()
  {
    /*
    * books表的id和chapters表中的book_id關(guān)聯(lián)
    * 一對(duì)多關(guān)系（一本書(shū)對(duì)應(yīng)多條章節(jié)）
    */
    $instance = new Chapter();
    $instance->setSuffix($this->id % 10);

    $foreignKey = $instance->getTable . '.' . $this->getForeignKey();
    $localKey = $this->getKeyName();

    return new HasMany($instance->newQuery(), $this, $foreignKey, $localKey);
  }
}