Laravel Seeder throws SQLSTATE[42000]: Syntax error or access violation - php

Question

I am having the following db tables
// Table 1: Foos
id, foo_name, foo_type, created_at, updated_at
// Table 2: Bars
id, bar_name, bar_type, parent_id, foo_id [ForeignKey], created_at, updated_at
// Table 3: Quxes
id, qux_name, bar_id [ForeignKey], created_at, updated_at
And I am having the following seeders setup
class FooSeeder extends Seeder
{
public function run()
{
\App\Models\Qux::truncate();
\App\Models\Bar::truncate();
\App\Models\Foo::truncate();
\App\Models\Foo::create([
'foo_name' => 'Foo',
'foo_type' => 'Foo type',
]);
}
}
class BarSeeder extends Seeder
{
public function run()
{
\App\Models\Qux::truncate();
\App\Models\Bar::truncate();
\App\Models\Bar::create([
'bar_name' => 'Bar',
'bar_type' => 'Bar type',
'foo_id' => 1,
'parent_id' => 1,
]);
\App\Models\Bar::create([
'bar_name' => 'Bar Bar',
'bar_type' => 'Bar Bar type',
'foo_id' => 1,
'parent_id' => 0,
]);
}
}
class QuxSeeder extends Seeder
{
public function run()
{
\App\Models\Qux::truncate();
\App\Models\Bar::truncate();
\App\Models\Qux::create([
'qux_name' => 'Qux',
'bar_id' => 1,
]);
\App\Models\Qux::create([
'qux_name' => 'Qux Qux',
'bar_id' => 1,
]);
}
}
When I try to run php artisan db:seed I get the following error
SQLSTATE[42000]: Syntax error or access violation: 1701 Cannot truncate a table referenced in a foreign key constraint (`mylaravelschema`.`quxes`, CONSTRAINT `qux_bar_id_foreign` FOREIGN KEY (`bar_id`) REFERENCES `mylaravelschema`.`bars` (`id`)) (SQL: truncate table `bars`)
I have been trying to play with the order of truncating the tables on these three seeders and still haven't manage to sort this, any help appreciated.

Answer 1

use it like this
class FooSeeder extends Seeder
{
public function run()
{
\App\Models\Foo::truncate();
\App\Models\Bar::truncate();
\App\Models\Qux::truncate();
\App\Models\Foo::create([
'foo_name' => 'Foo',
'foo_type' => 'Foo type',
]);
}
}
class BarSeeder extends Seeder
{
public function run()
{
\App\Models\Bar::create([
'bar_name' => 'Bar',
'bar_type' => 'Bar type',
'foo_id' => 1,
'parent_id' => 1,
]);
\App\Models\Bar::create([
'bar_name' => 'Bar Bar',
'bar_type' => 'Bar Bar type',
'foo_id' => 1,
'parent_id' => 0,
]);
}
}
class QuxSeeder extends Seeder
{
public function run()
{
\App\Models\Qux::create([
'qux_name' => 'Qux',
'bar_id' => 1,
]);
\App\Models\Qux::create([
'qux_name' => 'Qux Qux',
'bar_id' => 1,
]);
}
}
please use this hierarchy level because you've the foreign keys and when you're going to truncate it cannot find the reference one
Hope it helps