$table->foreignId('account_id')->index()->constrained()->cascadeOnDelete();

update your `integer('user_id')` to `bigInteger('user_id')`

public function up() { 

        Schema::create('evaluation', function (Blueprint $table) { 

            $table->increments('id'); 

            $table->bigInteger('user_id')->unsigned()->index(); 

            $table->timestamps();

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

        });

    }

Schema::table('posts', function (Blueprint $table) {

    $table->unsignedBigInteger('user_id');

​

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

});

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

use Illuminate\Database\Schema\Blueprint;

use Illuminate\Support\Facades\Schema;

​

Schema::table('posts', function (Blueprint $table) {

    $table->unsignedBigInteger('user_id');

​

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

});

$table->foreign('column_name')->references('id')->on('table_name')->onDelete('cascade');

$table->foreignId('post_id')

                ->constrained()

                ->onUpdate('cascade')

                ->onDelete('cascade');

Schema::table('posts', function (Blueprint $table) {

    $table->foreignId('user_id')->constrained();

});

use Illuminate\Database\Migrations\Migration;

use Illuminate\Database\Schema\Blueprint;

use Illuminate\Support\Facades\Schema;

​

class AddForeignKeyToTable extends Migration

{

    /**

     * Run the migrations.

     *

     * @return void

     */

    public function up()

    {

        Schema::table('your_table_name', function (Blueprint $table) {

            $table->foreign('foreign_key_column')->references('referenced_column')->on('referenced_table')->onDelete('cascade');

        });

    }

​

    /**

     * Reverse the migrations.

     *

     * @return void

     */

    public function down()

    {

        Schema::table('your_table_name', function (Blueprint $table) {

            $table->dropForeign(['foreign_key_column']);

        });

    }

}

Firstly you have to make your user_id field an index:

​

$table->index('user_id');

After that you can create a foreign key with an action on cascade:

​

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

If you want to do that with a new migration, you have to remove the index and foreign key firstly and do everything from scratch.

​

On down() function you have to do this and then on up() do what I've wrote above:

​

$table->dropForeign('lists_user_id_foreign');

$table->dropIndex('lists_user_id_index');

$table->dropColumn('user_id');