keep getting error when trying to add foreign key constraints - laravel

Question

I have the book migration file:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateBooksTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('books', function (Blueprint $table) {
$table->increments('id');
$table->timestamps();
$table->string('title');
$table->string('Author');
$table->text('Book_description');
$table->integer('user_id');
$table->foreign('user_id')->refrences('id')->on('users');
$table->boolean('donated')->default(false);
$table->string('country',150);
$table->string('city',30);
$table->string('path');
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('books');
}
}
but when I run the following command:
php artisan migrate:refresh
I get the following error:
Illuminate\Database\QueryException : SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 (SQL: alter table books add constraint books_user_id_foreign foreign key (user_id) references users ())
I have searched Google but could not find what is wrong and also I have read Laravel 5.6 docs but I could not figure out what is wrong.

Answer 1

There's a typo: It has to be ->references('id') instead of ->refrences('id').

Answer 2

Try with this
public function up()
{
Schema::create('books', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id');
});
Schema::table('books', function($table) {
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
});
}