What wrong with this migration - laravel-5

Question

Hello I am practicing Laravel now and I'm doing some migration but when I try to run my migration I got this following errors.
[Illuminate\Database\QueryException]
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (
sample.#sql-1d0c_20f, CONSTRAINT products_product_type_id_foreign FOREIGN KEY (product_type_id) REFERENCE
S product_types (id) ON DELETE CASCADE) (SQL: alter table products add constraint products_product_type_id_foreig
n foreign key (product_type_id) references product_types (id) on delete cascade)
[PDOException]
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (
sample.#sql-1d0c_20f, CONSTRAINT products_product_type_id_foreign FOREIGN KEY (product_type_id) REFERENCE
S product_types (id) ON DELETE CASCADE)
this is my my product_types migration code
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('product_types', function (Blueprint $table) {
$table->increments('id');
$table->string('product_type')->unique();
$table->tinyInteger('status')->nullable(false); //1 for active 2 for inactive
$table->timestamps('created_at');
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::drop('product_types');
}
Adding FK constrain in product table
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
/**
* Drop column type in products table
*/
Schema::table('products', function (Blueprint $table) {
$table->dropColumn('type');
});
/**
* Create column product_type in products table
*/
Schema::table('products', function (Blueprint $table) {
$table->integer('product_type_id')->unsigned()->after('price');
$table->foreign('product_type_id')->references('id')->on('product_types')->onDelete('cascade');
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
/**
* Drop column product_type_id in products table
*/
Schema::table('products', function (Blueprint $table) {
$table->dropForeign('product_type_id');
$table->dropColumn('product_type_id');
});
/**
* Re-create column type in products table
*/
Schema::table('products', function (Blueprint $table) {
$table->string('type')->after('price');
});
}

Answer 1

Try changing the migrations order, being sure product_types is before product table.