laravel join three tables - laravel

Question

I have three tables that are as follows:
invent_accessory
id,code,detail,is_length
invent_price_accessory
id,invent_accessory_id_fk,price,color
invent_price_accessory_length
id,invent_accessory_id_fk,price,color
how do i combine these three tables so that i can get id,code,detal,is_length,price,color
i have done following but it doesnt not return any data:
public function getAccessoryInventPrice(){
$accessory=DB::table('invent_accessory')
->select('invent_accessory.id as accessory_id')
->join('invent_price_accessory','invent_price_accessory.invent_accessory_id_fk','=','invent_accessory.id')
->join('invent_price_accessory_length','invent_price_accessory_length.invent_accessory_id_fk','=','invent_accessory.id')
->get();
return $accessory;
}
I am guessing that I have to do Union between invent_price_accessory and invent_price_accessory_length first then join with invent_accessory? How do i do this? pls help.

Answer 1

My guess was right!! i was able to solve this by:
public function getAccessoryInventPrice(){
$data1=\DB::table('invent_price_accessory')->select('accessory_code_id','color_id','rate');
$data2=\DB::table('invent_price_acc_length')->select('accessory_code_id','color_id','rate')
->union($data1);
$query= \DB::table(\DB::raw("({$data2->toSql()}) as invent_price"))
->join('invent_accessory','invent_price.accessory_code_id','=','invent_accessory.id')
->join('invent_color','invent_price.color_id','=','invent_color.id')
->select('invent_accessory.id','code','sl_detail','is_length','rate','invent_color.name')
->orderBy('invent_accessory.id','asc')
->get();
return $query;
}