How to improve testing and code review

Pretty certain I am missing something obvious in my code as I am still learning testing with Laravel:

The controller store method:

   public function store(Request $request)
    {
        $products = $request->products; // Products model pivot table

        $request->merge(['is_active' => $request->is_active == 'true']); // Checkbox, ensuring we have true or false

        $validated = $request->validate([
            'name' => 'required',
            'level_id' => 'required',
            'description' => 'required',
            'is_active' => 'nullable',
            'address' => 'nullable',
            'address2' => 'nullable',
            'country' => 'nullable',
            'state' => 'nullable',
            'city' => 'nullable',
            'postcode' => 'nullable',
            'website' => 'nullable',
            'telephone' => 'nullable',
            "contacts.*.name"  => "nullable|string",
            "contacts.*.email"  => "nullable|email",
            "contacts.*.user_id" => "nullable|integer",
            "contacts.*.contact_type_id" => "integer",
        ]);

		// Is there a better way to do these 2 steps?
        $contacts = $validated['contacts']; // Put contacts into separate array
        unset($validated['contacts']); // Remove contacts from validated data

        $org = Organizations::create($validated); // Create new entry in Organizations

		// Is there a better way to do these 2 steps?
        $org->contacts()->delete(); // Delete any contacts that exist for this org
        $org->contacts()->createMany($contacts); // Create new contacts for this org. 

        $org->products()->sync($products); // Sync (pivot table) products

        return redirect(route('organizations.index'));
    }

The above all works as expected. However, testing that contacts have been created is not currently working, as the organizations_id being added when calling createMany($contacts) is not available to the test:

   /** @test */
    public function can_create_org_with_contacts()
    {
        $this->signInAdmin();
        $this->withoutExceptionHandling();

        OrganizationLevels::factory()->create();
        ContactTypes::factory()->count(2)->create();
        $org = Organizations::factory()->make();
        $contacts = Contacts::factory()->count(4)->make()->toArray();
        $org->contacts = $contacts;

        $this->post(route('organizations.store'), $org->toArray())
            ->assertRedirect(route('organizations.index'));

        $this->assertDatabaseHas('contacts', $contacts[1]);
    }

The result is

Failed asserting that a row in the table [contacts] matches the attributes {
    "name": "Janet Lesch",
    "email": "[email protected]",
    "organizations_id": null,
    "contact_type_id": 2,
    "user_id": 1
}.

Found similar results: [
    {
        "id": "2",
        "organizations_id": "1",
        "contact_type_id": "2",
        "user_id": "1",
        "name": "Janet Lesch",
        "email": "[email protected]",
        "created_at": "2021-03-09 17:13:34",
        "updated_at": "2021-03-09 17:13:34"
    }
].

Questions:

• Is there a cleaner, better way to accomplish what I have shown above?
• Is there a way to test with success, the added contacts?