Question

我正在使用软件包https://github.com/musonza/groups在laravel应用中添加组系统，但是当我要迁移时，出现错误消息：

Migration table created successfully.
Migrating: 2019_05_26_125854_create_groups_tables

   Illuminate\Database\QueryException  : SQLSTATE[HY000]: General error: 1005 Can't create table `groupsystem`.`#sql-2678_26` (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table `groups` add constraint `groups_user_id_foreign` foreign key (`user_id`) references `users` (`id`) on delete cascade)

这是我的2个迁移表代码：

<?php

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

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }

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

这也是我从安装软件包中获得的迁移表：我在这篇文章顶部的链接中提到的这是我第一次尝试使用该软件包我试图在我的laravel应用程序上创建一个组系统任何其他建议都将受到欢迎

<?php

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

class CreateGroupsTables extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('groups', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('description')->nullable();
            $table->string('short_description')->nullable();
            $table->string('image')->nullable();
            $table->string('url')->nullable();
            $table->integer('user_id')->unsigned();
            $table->boolean('private')->unsigned()->default(false);
            $table->integer('conversation_id')->unsigned()->nullable();
            $table->text('extra_info')->nullable();
            $table->text('settings')->nullable();
            $table->timestamps();

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

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

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

            $table->foreign('group_id')
                ->references('id')
                ->on('groups')
                ->onDelete('cascade');
        });

        Schema::create('posts', function (Blueprint $table) {
            $table->increments('id');
            $table->string('title');
            $table->text('body');
            $table->string('type');
            $table->integer('user_id')->unsigned();
            $table->text('extra_info')->nullable();
            $table->timestamps();

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

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

            $table->foreign('user_id')
                ->references('id')
                ->on('users');

            $table->foreign('post_id')
                ->references('id')
                ->on('posts');
        });

        Schema::create('group_post', function (Blueprint $table) {
            $table->integer('group_id')->unsigned();
            $table->integer('post_id')->unsigned();
            $table->timestamps();

            $table->foreign('group_id')
                ->references('id')
                ->on('groups')
                ->onDelete('cascade');

            $table->foreign('post_id')
                ->references('id')
                ->on('posts')
                ->onDelete('cascade');
        });

        Schema::create('likes', function (Blueprint $table) {
            $table->integer('user_id')->index();
            $table->integer('likeable_id')->unsigned();
            $table->string('likeable_type');
            $table->primary(['user_id', 'likeable_id', 'likeable_type']);
            $table->timestamps();
        });

        Schema::create('reports', function (Blueprint $table) {
            $table->integer('user_id')->index();
            $table->integer('reportable_id')->unsigned();
            $table->string('reportable_type');
            $table->primary(['user_id', 'reportable_id', 'reportable_type']);
            $table->timestamps();
        });

        Schema::create('group_request', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id')->unsigned()->index();
            $table->integer('group_id')->unsigned()->index();
            $table->timestamps();

            $table->foreign('group_id')
                ->references('id')
                ->on('groups')
                ->onDelete('cascade');

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

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('groups');
        Schema::drop('group_user');
        Schema::drop('posts');
        Schema::drop('comments');
        Schema::drop('group_post');
        Schema::drop('likes');
        Schema::drop('reports');
        Schema::drop('group_request');
    }
}

Answer 1

我确实找到了解决方案，这是因为新的Laravel 5.8.3附带了unsignedBigInteger（id）而不是增量（id）

Answer 2

如果您使用过laravel 5.8，则

$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users');

如果您使用过laravel <5.8，那么

$table->unsignedInteger('user_id');
$table->foreign('user_id')->references('id')->on('users');

迁移的外键问题

2 个答案: