Foreign key not being created - php

Question

I'm trying to create a foreign key in the teachers table. after migration, all the columns were there, but the foreign key was not created
First, I have created two tables, which are the users table and the courses table.
if(! Schema::hasTable('users')) {
Schema::create('users', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('email');
$table->string('password');
$table->string('remember_token')->nullable();
$table->timestamps();
});
}
if(! Schema::hasTable('courses')) {
Schema::create('courses', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->string('slug')->nullable();
$table->text('description')->nullable();
$table->decimal('price', 15, 2)->nullable();
$table->string('course_image')->nullable();
$table->date('start_date')->nullable();
$table->tinyInteger('published')->nullable()->default(0);
$table->timestamps();
$table->softDeletes();
$table->index(['deleted_at']);
});
}
Then i created another table called 'teachers' with foreign keys
if(! Schema::hasTable('teacher')) {
Schema::create('teacher', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->integer('course_id')->unsigned();
$table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
$table->string('teachers_image')->nullable();
$table->text('education')->nullable();
$table->text('contact')->nullable();
$table->timestamps();
$table->softDeletes();
});
}
after the migration i can see the tables was there but the foreign key was not created

Answer 1

try this
if(! Schema::hasTable('teacher')) {
Schema::create('teacher', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->unsignedInteger('course_id');
$table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
$table->string('teachers_image')->nullable();
$table->text('education')->nullable();
$table->text('contact')->nullable();
$table->timestamps();
$table->softDeletes();
});
}