Laravel With和wherePivot

Question

I'm trying to extract all companies and contacts with pivot.main_contact = 1.

Tables:

Company: id, name
Company_contacts: id, company_id, contact_id, main_contact
Contacts: id, name

Model:

class Company extends Model
{
        public function mainContact()
    {
        return $this->belongsToMany('App\Contact', 'company_contacts')
                        ->wherePivot('main_contact', '=', 1);
    }
}

Controller:

$query = Company::with('mainContact')->get();   

This returns companies + ALL contacts for the companies and NOT ONLY the ones with main_contact = 1.

Answer 1

Try to add withPivot() :

return $this->belongsToMany('App\Contact', 'company_contacts')
    ->withPivot('main_contact')
    ->wherePivot('main_contact', '=', 1);

Answer 2

Company::with('mainContact')->get(); returns all compaines and all contacts. You should be doing $company->mainContacts()->get(); instead.

$companies=Company::all();
foreach($companies as $company)
{
   print_r($company->mainContact()->get());
}
die;

Answer 3

First, for reasons I'm unsure of, you need to add withPivot('main_contact'); to your relation. This will return main_contact in your collection under pivot

class Company extends Model
{
        public function mainContact()
    {
        return $this->belongsToMany('App\Contact', 'company_contacts')
                        ->withPivot('main_contact');
    }
}

The second thing you need to do is use withPivot() while constraint eager loading like so:

$companies = Company::with(['mainContact'=> function($query){
    $query->wherePivot('main_contact', 1);
}])->get();

I've checked it, it works.

Just to go a bit above and beyond. Sometimes you'll want to query a pivot table without knowing the value. You can do so by:

$companies = Company::with(['mainContact'=> function($query) use ($contact){
    $query->wherePivot('main_contact', $contact);
}])->get();