有很多返回 null 值 laravel

Question

I'm having a problem with laravel's OnetoMany feature. My goal is to retrieve the different codes of a user: Code Model:

 public function users(){
    return $this->belongsTo('App\Users');
}

User model:

    public function code(){
    return $this->hasMany('App\Code');
}

And my controller:

        $users= Users::find($id);
    dd($users->codes);

But this function is returning "null". I can retrieve my user's data but not the associated codes. Thank for your help !

Answer 1

Couple of issues in your code:

• $users = Users::find($id) returns a single record with the corresponding $id so naming it $users is a little misleading.
• In your question your model class is defined as User but when calling it with find() you defined it as Users , don't know which one is right but all models names should be single , so User not Users .
• in your User model the name of the function is code() but you call it as $users->codes that's wrong it should be $users->code .

Answer 2

you should rename the code relation in user model to be plural:

public function codes()
{
    return $this->hasMany('App\Code');
}

and then:

  $user= Users::with('codes')->find($id);
    dd($user->codes);

please note that find retrieve only one user so name the variable '$user' not '$users'