Laravel Bedingt Join Tabellen basierend auf angegebenen Klasse

Question

Ich habe drei Tabellen customers, organizations und contacts. Tabelle customers Tabelle hat Spalten customer_class (die Klasse zeigt Tabelle Verwendung Organization, Contact) und customer_id (entspricht Spalte id in entweder organizations oder contacts).

Also, was ich tat, war

$interactions = DB::table('sales_interactions') 
->join('customers', 'customers.id', '=', 'sales_interactions.customer_id') 
->join('organizations', function($join) 
{ 
    $join->on('customers.customer_id', '=', 'organizations.id') 
     ->where('customers.customer_class', '=', 'Organization');  
}) 
->join('contacts', function($join) 
{ 
    $join->on('customers.customer_id', '=', 'contacts.id') 
     ->where('customers.customer_class', '=', 'Contact');  
}) 

->select([ 
    'organizations.title as customer', 
    'contacts.name as customer', 
    'sales_interactions.id', 
    'sales_interactions.created_at', 
    'sales_interactions.title', 
    'status', 
    'deadline', 
    'value', 
]); 

Es funktionierte, als ich nur Organisationen beigetreten. Das Verknüpfen von Kontakten gibt jedoch null Ergebnisse zurück.

Answer 1

Sie benötigen eine Abfrage Vereinigung:

$contactsQuery = DB::table('sales_interactions') 
     ->join('customers', 'customers.id', '=', 'sales_interactions.customer_id') 
     ->join('contacts', function($join) 
     { 
      $join->on('customers.customer_id', '=', 'contacts.id') 
       ->where('customers.customer_class', '=', 'Contact'); 
     }) 
     ->select([ 
      'contacts.name as customer', 
      'sales_interactions.id', 
      'sales_interactions.created_at', 
      'sales_interactions.title', 
      'status', 
      'deadline', 
      'value', 
     ]); 

    $interactions = DB::table('sales_interactions') 
     ->join('customers', 'customers.id', '=', 'sales_interactions.customer_id') 
     ->join('organizations', function($join) 
     { 
      $join->on('customers.customer_id', '=', 'organizations.id') 
       ->where('customers.customer_class', '=', 'Organization'); 
     }) 
     ->select([ 
      'organizations.title as customer', 
      'sales_interactions.id', 
      'sales_interactions.created_at', 
      'sales_interactions.title', 
      'status', 
      'deadline', 
      'value', 
     ]) 
     ->union($contactsQuery) 
     ->get(); 

Answer 2

Werfen Sie einen Blick auf Polimorphic relationship in Laravel doc. Ich empfehle Laravel Orm, weil es sehr gut und einfach ist. Das, was Sie suchen, kann einfache Abfrage gemacht werden.