Laravel - adding relationships to a factory-created model - php

Question

I am testing an eager loading relationship which contains many to many relations. Right now I have the queries and attachments within the test. I'm wondering if there is a way to move them into the factory, rather than including it as part of your test. This would limit the size of the test and then these relations could be created and used every time a film factory is created.
test
public function grabFilmTest()
{
$film = factory(Film::class)->create();
$categories = Category::where('main-cat', 'Science')->where('sub-cat', 'Fiction')->first();
$languages = Languages::where('name', 'english')->first();
$film->categories()->attach($categories->id);
$film->languages()->attach($languages->id);
$response = $this->json('GET', '/film/' . $film->id)
->assertStatus(200);
$response
->assertExactJson([
'id' => $film->id,
'name' => $film->name,
'description' => $film->description,
'categories' => $film->categories->toArray(),
'languages' => $film->languages->toArray()
}
filmFactory
$factory->define(\App\Models\Film::class, function (Faker $faker){
return [
'id' => $faker->uuid,
'name' => $faker->text,
'description' => $faker->paragraph,
];
});
If anyone could help with how i could do this or an example it would be great :D

Answer 1

You could use factory states and factory callbacks.
$factory->define(\App\Models\Film::class, function (Faker $faker){
return [
'id' => $faker->uuid,
'name' => $faker->text,
'description' => $faker->paragraph,
];
});
$factory->define(\App\Models\Category::class, function (Faker $faker){
return [
// Category fields
];
});
$factory->define(\App\Models\Language::class, function (Faker $faker){
return [
// Language fields
];
});
$factory->afterCreatingState(\App\Models\Film::class, 'with-category', function (\App\Models\Film $film) {
$category = factory(\App\Models\Category::class)->create();
$film->categories()->attach($category->id);
});
$factory->afterCreatingState(\App\Models\Film::class, 'with-language', function (\App\Models\Film $film) {
$language = factory(\App\Models\Language::class)->create();
$film->categories()->attach($language->id);
});
Then you can use in tests like this:
public function grabFilmTest()
{
$film = factory(Film::class)->create();
$filmWithCategory = factory(Film::class)->state('with-category')->create();
$filmWithLanguage = factory(Film::class)->state('with-language')->create();
$filmWithCategoryAnLanguage = factory(Film::class)->states(['with-category', 'with-language'])->create();
// ...
}
PS: I don't recommend using existing data. From experience, I can tell you that can become really painful.

Answer 2

You can use factory callbacks to do it in the factory file:
<?php
use \App\Models\Film;
use \App\Models\Category;
use \App\Models\Languages;
$factory->define(Film::class, function(Faker $faker){
return [
'id' => $faker->uuid,
'name' => $faker->text,
'description' => $faker->paragraph,
];
});
$factory->afterCreating(Film::class, function(Film $film, Faker $faker) {
$category = Category::where('main-cat', 'Science')->where('sub-cat', 'Fiction')->first();
$language = Languages::where('name', 'english')->first();
$film->categories()->attach($category);
$film->languages()->attach($language);
});