[英]Call to a member function save() on null in Laravel test
我正在 Codecourse 上學習 Laravel 課程。 到目前為止,我有一個類別 model:
class Category extends Model
{
protected $fillable = [
'name',
'slug',
'order'
];
public function scopeParents(Builder $builder){
$builder->whereNull('parent_id');
}
public function scopeOrder(Builder $builder, $direction = 'asc'){
$builder->orderBy('order', $direction);
}
public function children(){
$this->hasMany(Category::class, 'parent_id', 'id');
}
}
一個工廠:
$factory->define(Category::class, function (Faker $faker) {
return [
'name' => $name = $faker->unique()->name,
'slug' => Str::slug($name)
];
});
和一個測試
public function test_it_has_many_children()
{
$category = factory(Category::class)->create();
$category->children()->save(
factory(Category::class)->create()
);
$this->assertInstanceOf(Category::class, $category->children->first());
}
但是,當我運行測試時,我得到:
Call to a member function save() on null
at tests/Unit/Models/Categories/CategoryTest.php:14
10| public function test_it_many_children()
11| {
12| $category = factory(Category::class)->create();
13|
> 14| $category->children()->save(
15| factory(Category::class)->create()
16| );
17|
18| $this->assertInstanceOf(Category::class, $category->children->first());
是什么賦予了? 該課程已有幾年的歷史,因此我認為 Laravel 版本之間存在一些差異,但這似乎更基本一些。
您在關系方法中缺少返回:
public function children()
{
return $this->hasMany(Category::class, 'parent_id', 'id');
}
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