我如何过滤具有一对多关系的数据透视表 - Laravel 7

Question

Tables

For example, i have 4 tables:

Tables Diagram

Models

// PlacedBet
public function odds()
{
    return $this->belongsToMany(Odd::class, 'placed_bets_has_odds');
}

// Odd
public function placedBets()
{
    return $this->belongsToMany(PlacedBet::class, 'placed_bets_has_odds');
}

// Result
public function placedBetsOdds()
{
    return $this->hasMany(PlacedBetOdd::class);
}

// PlacedBetOdd
public function result()
{
    return $this->belongsTo(Result::class);
}

Issue

I want all PlacedBets where placed_bets_has_odds.result_id equal null. But i don't know how can i do that with Eloquent in my PlacedBetRepository file.

Thank you for your help

Answer 1

You can use whereDoesntHave to get null relationships.

PlaceBets::whereDoesntHave('results)->get();

But as @Naveed Ali has implied in the comment, you would need to place a results relationship in the PlaceBets model;

public function results()
{
  return $this->belongsToMany(Result::class, 'placed_bets_has_odds');
}