Question

我正在尝试迁移到其他主机中的新数据库。但是，当我运行php artisan migrate时，这给我一个错误。 Laravel在我的应用程序中正在寻找一个特定的表（在这种情况下，权限表已建立，这是我的雄辩性关系）。显然，一个新的数据库是完全空的。如何在新主机中运行到新数据库的迁移？我在这里想念什么？

In Connection.php line 664:

  SQLSTATE[42S02]: Base table or view not found: 1146 Table 'cf.permissions' doesn't exist (SQL: select * from `permissions`)


In PDOConnection.php line 63:

  SQLSTATE[42S02]: Base table or view not found: 1146 Table 'cf.permissions' doesn't exist


In PDOConnection.php line 61:

  SQLSTATE[42S02]: Base table or view not found: 1146 Table 'cf.permissions' doesn't exist

权限迁移文件；

<?php

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

class CreatePermissionRoles extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('permissions', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('label');
            $table->timestamps();
        });

        Schema::create('roles', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('label');
            $table->timestamps();
        });

        Schema::create('permission_role', function (Blueprint $table) {
            $table->integer('permission_id')->unsigned();
            $table->integer('role_id')->unsigned();

            $table->foreign('permission_id')
                    ->references('id')
                    ->on('permissions')
                   /* ->onDelete('cascade') */
;

            $table->foreign('role_id')
                    ->references('id')
                    ->on('roles')
                    /* ->onDelete('cascade') */
;

            $table->primary(['permission_id', 'role_id']);
        });

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

            $table->foreign('role_id')
                    ->references('id')
                    ->on('roles')
                    /* ->onDelete('cascade') */
;

            $table->foreign('user_id')
                    ->references('id')
                    ->on('users')
                    /* ->onDelete('cascade') */
;

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

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('permissions');
        Schema::dropIfExists('role_user');
        Schema::dropIfExists('permission_role');
        Schema::dropIfExists('roles');
    }
}

AppServiceProvider文件；

public function boot()
{
    $this->registerPolicies();

    foreach ($this->getPermissions() as $permission) {
        Gate::define($permission->name, function ($user) use ($permission) {
            return $user->hasRole($permission->roles);
        });
    }
}

protected function getPermissions()
{
    return Permission::with('roles')->get();
}

Answer 1

在您的getPermissions()方法中，检查模式permissions和roles是否存在，并使用Schema's hasTable()方法相应地返回值。这种迁移命令不会妨碍服务提供商的方法。

请注意，一旦设置了2个表（成功迁移之后），将始终执行服务提供商的此操作。

<?php


protected function getPermissions(){
    if(Schema::hasTable('permissions') && Schema::hasTable('roles')){
        return Permission::with('roles')->get();
    }

    return collect([]);
}

Laravel迁移到新的服务器/数据库

1 个答案: