I'm currently working on a school project and ran in to this problem with my database, I want to create a relationship with videos and categories here are my two tables. The video table:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateVideosTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('videos', function (Blueprint $table) {
$table->increments('id');
$table->string('name')->default('');
$table->string('url')->default('');
$table->integer('category_id')->unsigned()->nullable();
$table->foreign('category_id')->references('id')->on('categories');
$table->string('img_url')->default('');
$table->integer('views')->nullable();
$table->integer('rating')->nullable();
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('videos');
}
}
And the categories table:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateCategoriesTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('categories', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('categories');
}
}
When i run php artisan migrate:refresh in the console i get this error:
[Illuminate\Database\QueryException] SQLSTATE[HY000]: General error: 1215
Cannot add foreign key constraint (SQL: alter table `videos` add constraint
`videos_category_id_foreign` foreign key (`category_id`) references
`categories` (`id`))
[PDOException] SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
i dont see why because when i change this:
$table->foreign('category_id')->references('id')->on('categories');
to this:
$table->foreign('category_id')->references('id')->on('users');
It works and then i have no error's whatsoever, i hope someone can help me out with this!