How to seed related data during migration in Laravel?

Question

I have a table clients and a table contracts. In my Client model I have

public function contract()
    {
        return $this->hasOne(
            'App\Models\Contract',
            'client_id',
            'id'
        );
    }

I don't want to have any client without a contract in my database. When I seed my clients, using the factory with faker data, I want to create contracts that are mapped to client using the foreign key user_id on the contract.

Answer 1

This is what worked for me:

App\Models\Client::factory(10)->create()->each(function ($client) {
    $client->contract()->save(Contract::factory()->make());
});