laravel - HasManyThrough with one-to-many relationship

Question

I am working on small scale CMS for a project with tables like so:

- pages
    - id
    …
- translations
    - page_id
    …
- menus
    - id
    …
- menu_page
    - menu_id
    - page_id
    …

In the Menu model I have this relationship:

function pages(){
    return $this->hasMany('Page');
}

Is it possible to create a relation directly between Menu and Translations that translates to something like this SQL query:

select translations.* 
from translations
inner join menu_page on menu_page.page_id = translations.page_id
where menu_page.menu_id = ?;

Thanks!

Answer 1

You can't do it with builtin methods, hasManyThrough won't work with many-to-many relation menus-pages.

However you can try a workaround like this:

public function getTranslationsAttribute()
{
    if ( ! array_key_exists('translations', $this->relations)) $this->loadTranslations();

    return $this->getRelation('translations');
}

protected function loadTranslations()
{
    $translations = Translation::join('menu_page', 'translations.page_id', '=', 'menu_page.page_id')
        ->where('menu_page.menu_id', $this->getKey())
        ->distinct()
        ->get(['translations.*','menu_id']);

    $hasMany = new IlluminateDatabaseEloquentRelationsHasMany(Translation::query(), $this, 'menu_id', 'id');

    $hasMany->matchMany(array($this), $translations, 'translations');

    return $this;
}

Now you can do this:

$menu = Menu::find($id);
$menu->translations; // Eloquent Collection of Translation models

So basically just like you would use any relation. The only trouble is that you can't eager load it.