Create Model & attach Many to many

Hi everyone. I have 3 tables: tags, posts, post_tag. I am creating post and attaching tag like this:

$post = new Post();

if($post->create($request->all())) 
{
    foreach ($request->input('tags') as $tag)
              $post->tags()->attach($tag->id);
}

But Laravel saying like this:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'post_id' cannot be null

Can you tell me simplest way to fix it?

tykus

9 years ago

Best Answer

Level 104

$post is not saved to the database, so has no ID

$post = Post::create($request->all()); 

$post->tags()->attach($request->tags);

Please or to participate in this conversation.