give category id to subcategory in laravel seed - laravel

Question

I try to add data with seed in laravel 5.4, let's say I have 10 category and I added them by seed to my database now I also have another seed for subcategories but before I add my subcategories I want to tell which one is belongs to what category that I imported before. how would I do that?
Update:
I found my question might be confusing for some people so i try to explain a bit more,
this is my category seed.
<?php
use Illuminate\Database\Seeder;
class CategoriessTableSeeder extends Seeder {
public function run()
{
DB::table('categories')->delete();
$categories = array(
array('name' => 'Accounting/Finance', 'slug' => 'hccounting_finance'),
array('name' => 'Admin/Human Resources', 'slug' => 'admin_human_resources'),
array('name' => 'Arts/Media/Communications', 'slug' => 'arts_media_communications'),
array('name' => 'Building/Construction', 'slug' => 'building_construction'),
array('name' => 'Computer/Information Technology', 'slug' => 'computer_information_technology'),
array('name' => 'Education/Training', 'slug' => 'education_training'),
array('name' => 'Engineering', 'slug' => 'engineering'),
array('name' => 'Healthcare', 'slug' => 'healthcare'),
array('name' => 'Hotel/Restaurant', 'slug' => 'hotel_restaurant'),
array('name' => 'Manufacturing', 'slug' => 'manufacturing'),
array('name' => 'Sales/Marketing', 'slug' => 'sales_marketing'),
array('name' => 'Sciences', 'slug' => 'sciences'),
array('name' => 'Services', 'slug' => 'services'),
array('name' => 'Others', 'slug' => 'others'),
);
DB::table('categories')->insert($categories);
}
}
I have another similar with this for subcategories here it is:
<?php
use Illuminate\Database\Seeder;
class SubategoriessTableSeeder extends Seeder {
public function run()
{
DB::table('subcategories')->delete();
$subcategories = array(
array('name' => 'Audit & Taxation Jobs', 'slug' => 'audit_taxation_jobs', 'category_id' => ''),
);
DB::table('subcategories')->insert($subcategories);
}
}
in this sample 'category_id' => '' has to get the id/name of 'Accounting/Finance category in category seed .
now my question is how?
UPDATE 2:
Error's
[Illuminate\Database\QueryException] SQLSTATE[23000]: Integrity
constraint violation: 1451 Cannot delete or update a parent row: a
foreign key constraint fails (jobid.ads, CONSTRAINT ads_subcateg
ory_id_foreign FOREIGN KEY (subcategory_id) REFERENCES
subcategories (id)) (SQL: delete from subcategories)
[PDOException]
SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails
(jobid.ads, CONSTRAINT ads_subcateg
ory_id_foreign FOREIGN KEY (subcategory_id) REFERENCES subcategories (id))
Code used:
<?php
use Illuminate\Database\Seeder;
use Carbon\Carbon;
class SubcategoriesTableSeeder extends Seeder {
public function run()
{
DB::table('subcategories')->delete();
$categoryFinance = Category::select("id")->whereSlug("hccounting_finance")->firstOrFail();
$subcategories = array(
array('name' => 'Audit & Taxation Jobs', 'category_id' => $categoryFinance, 'slug' => 'audit_taxation_jobs', 'created_at' => Carbon::now()->format('Y-m-d H:i:s'), 'updated_at' => Carbon::now()->format('Y-m-d H:i:s')),
array('name' => 'Banking/Financial Jobs', 'category_id' => $categoryFinance, 'slug' => 'banking-financial_jobs', 'created_at' => Carbon::now()->format('Y-m-d H:i:s'), 'updated_at' => Carbon::now()->format('Y-m-d H:i:s')),
array('name' => 'Corporate Finance/Investment Jobs', 'category_id' => $categoryFinance, 'slug' => 'corporate_finance_investment_jobs', 'created_at' => Carbon::now()->format('Y-m-d H:i:s'), 'updated_at' => Carbon::now()->format('Y-m-d H:i:s')),
array('name' => 'General/Cost Accounting Jobs', 'category_id' => $categoryFinance, 'slug' => 'general_cost_accounting_jobs', 'created_at' => Carbon::now()->format('Y-m-d H:i:s'), 'updated_at' => Carbon::now()->format('Y-m-d H:i:s')),
);
$categoryAdmin = Category::select("id")->whereSlug("admin_human_resources")->firstOrFail();
$subcategories = array(
array('name' => 'testing', 'slug' => 'tesingsubs', 'category_id' => $categoryAdmin, 'created_at' => Carbon::now()->format('Y-m-d H:i:s'), 'updated_at' => Carbon::now()->format('Y-m-d H:i:s')),
);
DB::table('subcategories')->insert($subcategories);
}
}

Answer 1

In order to relate your categories to subcategories, you should follow the logic (depending on your relationship - N-1 N-N) in the docs (https://laravel.com/docs/5.4/eloquent-relationships). It seems that you need the attach() method.
So after creating the category entry, if you have followed the schema convention you can apply logic for all kind or relationships, even for polymorphic ones.
Edit:
After your edit it seems that you need a way to access the entries of your table again in order to relate them.
So, you can :
$categoryFinance = Category::select("id")->whereSlug("hccounting_finance")->firstOrFail();
in your SubategoriessTableSeeder run() function before creating your array.
And then give that id in your subcategory_id. The same will be for all categories you need to relate.
Edit 2
Please check again that your foreign keys are correct. In that case you cannot delete the subcategories table because Categories "need" subid. And that's where constraint violation comes from. You don't need to delete these tables.. You just need to "feed-seed" them.
So try to remove the "delete" statements.
Edit 3
I think the error is obvious now.. There is no Category with id of 2 in your database. But again, check if the keys are associated correctly (this is an SQL and not a Laravel issue).
Run migrations if any, and seeders again, with the correct order (first categories and then subcategories - first the dependency and then the dependent one in general)