BelongsToMany with BelongsToMany relation

Question

I need to take data from a relation belongsToMany with belongsToMany, it would come to be so: A->B->C in my model would be providers->caption->eventType, so y need to take all providers from an event type.

model looks like:

Providers Model

Class Provider extends Model {
   public function captions() {
      return $this->belongsToMany(Caption::class);
   }
}

Captions Model

Class Caption extend Model {
   public function event_type() {
      return $this->belongsToMany(Event_type::class);
   }
   public function providers() {
      return $this->belongsToMany(Provider::class);
   }
}

Event Type Model

Class Event_type extends Model {
   public function captions() {
      return $this->belongsToMany(Caption::class);
   }
}

Database looks like:

providers

id

name

event_type

id

name

captions

id

name

caption_event_type

caption_id

event_type_id

caption_provider

caption_id

provider_id

Thnks.

Answer 1

According to my understanding our Model Structure should goes like this:

class Provider extends Model {
    public function captions()
    {
        return $this->belongsToMany(Caption::class);
    }
}

class EventType extends Model {
    public function captions()
    {
        return $this->belongsToMany(Caption::class);
    }
}

class Caption extends Model {
    public function providers()
    {
        return $this->belongsToMany(Provider::class);
    }

    public function eventTypes()
    {
        return $this->belongsToMany(EventType::class);
    }
}

and to get all the providers for a EventType, you get it like this:

$captions = EventType::find(1)->captions;

foreach($captions as $caption)
{
    $providers_arr[] = $caption->providers;
}

$providers_collection = collect($providers_arr)->unique();

Hope this helps!