Laravel-有一个或多个其他关系的口才关系

Question

I'm learning Laravel and Laravel eloquent at the moment and now I try to solve a problem using relations in Laravel. This is what I want to archive:

The database holds many sport clubs. A sport club has a lot of teams. Each team has games. The teams table has a column named club_id . Now I want to create Eloquent relations to get all games of a club.

Here is what I got so far:

Club model

id => PRIMARY

public function games()
    {
        return $this->hasMany('App\Models\Games')->whereHas('homeTeam')->orWhereHas('guestTeam');
    }

Game model

home_id => FOREIGN KEY of team ; guest_id => FOREIGN KEY of team

public function homeTeam()
    {
        return $this->belongsTo('App\Models\Team','home_id')->where('club_id','=', $club_id);
    }

    public function guestTeam()
    {
        return $this->belongsTo('App\Models\Team','guest_id')->where('club_id','=', $club_id);
    }

Team model

id => PRIMARY ; club_id => FOREIGN

In my controller all I want to do is Club::findOrFail($id)->games()

Executing the code above returns a SQL error that the games table does not have a column named club_id .

What is the correct way to create this kind of relation?

Thanks!

EDIT

Thanks to Nikola Gavric I've found a way to get all Games - but only where club teams are the home or away team.

Here is the relation:

public function games()
    {
        return $this->hasManyThrough('App\Models\Game','App\Models\Team','club_id','home_id');
    }

How is it possible to get the games where the home_id OR the guest_id matches a team of the club? The last parameter in this function does not allow an array.

Answer 1

There is method to retrieve a "distant relationship with an intermediary" and it is called Has Many Through .

There is also a concrete example on how to use it which includes Post , Country and User , but I think it will be sufficient to give you a hint on how to create games relationship inside of a Club model. Here is a link, but when you open it, search for hasManyThrough keyword and you will see an example.

PS: With right keys naming you could achieve it with:

public function games()
{
    return $this->hasManyThrough('App\Models\Games', 'App\Models\Teams');
}

---

EDIT #01

Since you have 2 types of teams, you can create 2 different relationships where each relationship will get you one of the type you need. Like this:

public function gamesAsHome()
{
    return $this
        ->hasManyThrough('App\Models\Games', 'App\Models\Teams', 'club_id', 'home_id');
}

public function gamesAsGuests()
{
    return $this
        ->hasManyThrough('App\Models\Games', 'App\Models\Teams', 'club_id', 'guest_id');
}

---

EDIT #02

Merging Relationships : To merge these 2 relationships, you can use merge() method on the Collection instance, what it will do is, it will append all the records from second collection into the first one .

$gamesHome = $model->gamesAsHome;
$gamesGuests = $model->gamesAsGuests;
$games = $gamesHome->merge($gamesGuests);

return $games->unique()->all();

Thanks to @HCK for pointing out that you might have duplicates after the merge and that unique() is required to get the unique games after the merge .

---

EDIT #03

sortBy also offers a callable instead of a attribute name in cases where Collection contains numerical indexing . You can sort your Collection like this:

$merged->sortBy(function($game, $key) {
    return $game->created_at;
});

Answer 2

When you define that Club hasMany games you are indicating that game has a foreign key called club_id pointing to Club. belongsTo is the same but in the other way. These need to be coherent with what you have on your database, that means that you need to have defined those keys as foreign keys on your tables.

Answer 3

Try this...

Club model

public function games()
    {
        return $this->hasMany('App\Models\Games');
    }

Game model

public function homeTeam()
    {
        return $this->belongsTo('App\Models\Team','home_id');
    }

    public function guestTeam()
    {
        return $this->belongsTo('App\Models\Team','guest_id');
    }

Your Query like

Club::where('id',$id)->has('games.guestTeam')->get();