Laravel 5.4-当模型有两个外来对象时如何获得正确的关系

Question

I have 4 tables,

user_challenges

• id
• challenge_id
• user_id

user_scores

• id
• user_id
• challenge_id

user

• id
• name

challenge

• id
• title

How, in UserChallenge Model, I can get the user_scores value?

What is the correct relationship to can use in eagerloading.

I need something like this:

public function scores ()
{
return UserScore::where('user_id', $this->user_id)->where('challenge_id', $this->challenge_id);
}

Answer 1

I think you're missing the ->get() call from the end of your query.

Try:

public function scores ()
{
    return UserScore::where('user_id', $this->user_id)->where('challenge_id', $this->challenge_id)->get();
}

Answer 2

There is no relationship (afaik) for your setup. You seek a relationship between 2 pivot tables, which is pretty uncommon.

You have 2 possibilities here in my opinion:
1) Merge them into 1 table
2) user_scores should not have user_id and challenge_id, but one key user_challenges_id and should just be in a belongsTo relationship to user_challenges.

Answer 3

There are 2 ways you can get the user_scores when using the UserChallenge Model. You can use a Query builder, like in your example. You just need to add ->get(); to that or it wont work.

Secondly, you can use the relations you defined. Example: $userChallenge = UserChallenge::find(1); return $userChallenge->user->user_scores $userChallenge = UserChallenge::find(1); return $userChallenge->user->user_scores

If you have defined the relations properly every model can link to the next in a deeper level