Question

我将SENTINEL框架与已实现的Sentinel迁移集成到了我的LARAVEL项目中。许多事情对我来说很清楚，但是我不明白为什么Role_users表中有2个主键，因为我了解到2个表之间的连接需要主键和外键，这里不是这种情况（role_users表）。如果有人知道解释，那对我来说很重要。

我的数据库方案

Php我的管理方案

migration_cartalyst_sentinel

db.getCollection('User').aggregate(
   [
      { $project: { 
          email : 1,
          fullName: { $concat: [ "$firstname", " - ", "$lastname" ] } } }
   ]
)

EloquentUser

<?php

/**
 * Part of the Sentinel package.
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the 3-clause BSD License.
 *
 * This source file is subject to the 3-clause BSD License that is
 * bundled with this package in the LICENSE file.
 *
 * @package    Sentinel
 * @version    2.0.17
 * @author     Cartalyst LLC
 * @license    BSD License (3-clause)
 * @copyright  (c) 2011-2017, Cartalyst LLC
 * @link       http://cartalyst.com
 */

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;

class MigrationCartalystSentinel extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('activations', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id')->unsigned();
            $table->string('code');
            $table->boolean('completed')->default(0);
            $table->timestamp('completed_at')->nullable();
            $table->timestamps();

            $table->engine = 'InnoDB';
        });

        Schema::create('persistences', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id')->unsigned();
            $table->string('code');
            $table->timestamps();

            $table->engine = 'InnoDB';
            $table->unique('code');
        });

        Schema::create('reminders', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id')->unsigned();
            $table->string('code');
            $table->boolean('completed')->default(0);
            $table->timestamp('completed_at')->nullable();
            $table->timestamps();

            $table->engine = 'InnoDB';
        });

        Schema::create('roles', function (Blueprint $table) {
            $table->increments('id');
            $table->string('slug');
            $table->string('name');
            $table->text('permissions')->nullable();
            $table->timestamps();

            $table->engine = 'InnoDB';
            $table->unique('slug');
        });

        Schema::create('role_users', function (Blueprint $table) {
            $table->integer('user_id')->unsigned();
            $table->integer('role_id')->unsigned();
            $table->nullableTimestamps();

            $table->engine = 'InnoDB';
            $table->primary(['user_id', 'role_id']);
        });

        Schema::create('throttle', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id')->unsigned()->nullable();
            $table->string('type');
            $table->string('ip')->nullable();
            $table->timestamps();

            $table->engine = 'InnoDB';
            $table->index('user_id');
        });

        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('email');
            $table->string('password');
            $table->text('permissions')->nullable();
            $table->timestamp('last_login')->nullable();
            $table->string('first_name')->nullable();
            $table->string('last_name')->nullable();
            $table->timestamps();

            $table->engine = 'InnoDB';
            $table->unique('email');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('activations');
        Schema::drop('persistences');
        Schema::drop('reminders');
        Schema::drop('roles');
        Schema::drop('role_users');
        Schema::drop('throttle');
        Schema::drop('users');
    }
}

Answer 1

Role_users在这种情况下用作数据透视表；它是Users和Roles之间多对多关系的中间表。一个用户可以属于多个角色，一个角色可以属于多个用户。

Role_users上的复合主键可确保没有一个用户两次具有相同的角色，反之亦然。主键是user_id和role_id的唯一组合。

为什么表（Sentinel框架数据库）中有2个主键？

1 个答案: