150 “Foreign key constraint is incorrectly formed”

I have a problem with migrating my table.

I have a users table that has a string id and the table was created before with SQL without a migration.

Later on, I created a table called surveys that has a foreign key to user_id with the following code .

hema::create('surveys', function (Blueprint $table) {
$table->increments('id');
$table->string('user_id',40);
$table->foreign('user_id')->references('id')->on('users') ->onUpdate('cascade')->onDelete('cascade');
$table->string('gender');
$table->string('age');
$table->string('education');
$table->string('proficiency');
$table->string('behaviour');
$table->timestamps();
});

I am always getting the below error whenever I try to migrate it and I have no clue why is this happening. The id in table users is varchar 40 and so is the user_id.


SQLSTATE[HY000]: General error: 1005 Can't create table `d0372341`.`surveys` (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table `surveys` add constraint `surveys_user_id_foreign` foreign key (`user_id`) references `users` (`id`) on delete cascade on update cascade)

at D:xampp installhtdocsgame-dbvendorlaravelframeworksrcIlluminateDatabaseConnection.php:692
688▕ // If an exception occurs when attempting to run a query, we'll format the error
689▕ // message to include the bindings with SQL, which will make this exception a
690▕ // lot more helpful to the developer instead of just the database's errors.
691▕ catch (Exception $e) {
➜ 692▕ throw new QueryException(
693▕ $query, $this->prepareBindings($bindings), $e
694▕ );
695▕ }
696▕ }

So if you can please help me with this I would really appreciate it.

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