Hi everyone,
I'm creating a blog with Laravel and I'm making the tag system. I'm using PHPunit for TDD, because I really like it. I was wondering: How could I test a BelongsToMany relationship in a unit test?
Here's the part of the test I'm currently having:
/** @test */
public function a_tag_has_posts()
{
$this->withoutExceptionHandling();
$tag = factory('App\Tag')->create();
$post = factory('App\Post')->create();
}
How could I test that a post has multiple tags and a tags has multiple posts.
Thank you! Jeroen
If you need more information, please ask me
assuming you have a tags method on the Post::class
$post = factory(Post::class)->create();
$tag = factory(Tag::class)->create();
$this->assertCount(0,$post->fresh()->tags);
$post->tags()->attach($tag);
$this->assertTrue($post->tags()->first()->is($tag));
$this->assertCount(1,$post->fresh()->tags);
Hi @thibaultvanc,
Thanks for your answer. I've created this test, but I'm still having a problem: BadMethodCallException: Method Illuminate\Database\Eloquent\Collection::attach does not exist.
/** @test */
public function a_tag_has_posts()
{
$this->withoutExceptionHandling();
$tag = factory('App\Tag')->create();
$post = factory('App\Post')->create();
$this->assertCount(0, $tag->posts);
$tag->posts->attach($post);
$this->assertCount(1, $tag->fresh()->posts);
$this->assertTrue($tag->posts()->first()->is($post));
}
I don't have an attach-method on my Tag model, but I do have this relationship:
public function posts()
{
return $this->belongsToMany(Post::class, 'posts_tags');
}
So, do I have to make an attach function or should it be working?
Thank you! Jeroen
try $tag->posts()->attach($post);
@jeroenvanrensen when you write $tag->posts it just access to a magic property which produced by posts() method in tag model. it is just a property. if you want to attach something to it, you should use relation method. not property. so, it's correct to use $tag->posts()->doSomeThing....
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