SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table `groups` add constraint `groups_user_id_foreign` foreign key (`user_id`) references `users` (`id`) on delete cascade)

[dimer22zhc]

SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table groups add constraint groups_user_id_foreign foreign key (user_id) references users (id) on delete cascade).

I'm getting this issue while trying to migrating _create_groups_tables. Any help plz

[trchristensen]

Replace your create_groups_tables migration file with this
edit: sorry, not sure how to make it neater. Basically, since you're using Laravel 5.8 you need to replace all instances of integer with unsignedBigInteger.

Off topic and maybe the wrong place to post this but I don't see anything or any methods on listing Group data. Only group members, posts, etc. If you figure out how to do this I would appreciate the help. I am still very much a beginner. Thanks.

`<?php

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

class CreateGroupsTables extends Migration
{
protected $useBigIncrements;

public function __construct()
{
    $this->useBigIncrements = app()::VERSION >= 5.8;
    
}

/**
 * Run the migrations.
 *
 * @return void
 */
public function up()
{
    if ($this->useBigIncrements) {
        Schema::create('groups', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');
            $table->string('description')->nullable();
            $table->string('short_description')->nullable();
            $table->string('image')->nullable();
            $table->string('url')->nullable();
            $table->unsignedBigInteger('user_id')->unsignedBigInteger();
            $table->boolean('private')->unsigned()->default(false);
            $table->unsignedBigInteger('conversation_id')->unsignedBigInteger()->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->bigIncrements('id');
            $table->unsignedBigInteger('user_id')->unsignedBigInteger();
            $table->unsignedBigInteger('group_id')->unsignedBigInteger();
            $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->bigIncrements('id');
            $table->string('title');
            $table->text('body');
            $table->string('type');
            $table->unsignedBigInteger('user_id')->unsignedBigInteger();
            $table->text('extra_info')->nullable();
            $table->timestamps();

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

        Schema::create('comments', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('body');
            $table->unsignedBigInteger('user_id')->unsignedBigInteger();
            $table->unsignedBigInteger('post_id')->unsignedBigInteger();
            $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->unsignedBigInteger('group_id')->unsignedBigInteger();
            $table->unsignedBigInteger('post_id')->unsignedBigInteger();
            $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->unsignedBigInteger('user_id')->index();
            $table->unsignedBigInteger('likeable_id')->unsignedBigInteger();
            $table->string('likeable_type');
            $table->primary(['user_id', 'likeable_id', 'likeable_type']);
            $table->timestamps();
        });

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

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

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

            $table->foreign('user_id')
                ->references('id')
                ->on('users')
                ->onDelete('cascade');
        });
    } else {
        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->unsignedBigInteger('user_id')->unsigned();
            $table->boolean('private')->unsigned()->default(false);
            $table->unsignedBigInteger('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->unsignedBigInteger('user_id')->unsigned();
            $table->unsignedBigInteger('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->unsignedBigInteger('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->unsignedBigInteger('user_id')->unsigned();
            $table->unsignedBigInteger('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->unsignedBigInteger('group_id')->unsigned();
            $table->unsignedBigInteger('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->unsignedBigInteger('user_id')->index();
            $table->unsignedBigInteger('likeable_id')->unsigned();
            $table->string('likeable_type');
            $table->primary(['user_id', 'likeable_id', 'likeable_type']);
            $table->timestamps();
        });

        Schema::create('reports', function (Blueprint $table) {
            $table->unsignedBigInteger('user_id')->index();
            $table->unsignedBigInteger('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->unsignedBigInteger('user_id')->unsigned()->index();
            $table->unsignedBigInteger('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');
}

}
`