如何检查用户在laravel中是否喜欢某些帖子

Question

I have posts, users and favorites table. For example, I make some post favorited for a user with an id of 3 like this :

User::find(3)->favorites()->attach($post->id);

and if users send request twice it will insert this favorite with this post_id, user_id twice. I want to check if a post is not liked by this user, then save record in the database. or if a post is favorited then unfavorite it. how can I do this with eloquent relationship ?? I have User, Post models.

Answer 1

You could use toggle():

User::find(3)->favorites()->toggle($post->id);

This would like it if it not liked, and unlike it if it is.

If you just want the function not to duplicate likes in the table, just use syncWithoutDetaching:

User::find(3)->favorites()->syncWithoutDetaching([$post->id]);

Putting this on your User model:

class User extends Model {

  public function like($postId){
    $this->favorites()->syncWithoutDetaching([$post->id]);
  }

  public function unlike($postId){
    $this->favorites()->detach([$post->id]);
  }
}