How to subract integer data using the other table with date condition? - php

Question

I want to decrement the _remain_overall_quantity from inventory table by using the feed_consumed in consumption table
In condition
if $chickenAge <= 8 The decrement will occur in CBC
if $chickenAge > 8 && $chickenAge <= 20 The decrement will occur in BSC
if $chickenAge > 20 The decrement will occur in BFP
This is my ConsumptionController.php
public function store(Request $request)
{
$this->validate($request, array(
'date_input' => 'required|date',
'feed_consumed' => 'required|numeric',
) );
//declaring values
$chickenAge = 0;
$input= Carbon::parse($request->get('date_input'));
$cycle = Cycle::where('date_of_loading','<=',$input)
->where('date_of_harvest','>=',$input)
->first();
if ($cycle) {
$start = Carbon::parse($cycle->date_of_loading);
$chickenAge = $start->diffInDays($input) ;
}
$inventory = Inventory::where('cycle_id','=',$cycle->id ?? 0)
->first();
$consumption = Consumption::create([
'date_input' => request('date_input'),
'chicken_age' => $chickenAge,
'feed_consumed' => request('feed_consumed'),
'cycle_id' => $cycle->id ?? 0,
'user_id' => Auth::id()
]);
return $consumption;
}
I don't know where can i put the decrement and i don't know what will be the if condition statement. Can you help me?

Answer 1

try adding this code just before you return statement:
if ($chickenAge <= 8)
{
DB::table('inventory')->where('id', 1)->decrement('remain_overall_quantity ', 1); // CBC
}
elseif ($chickenAge <= 20)
{
DB::table('inventory')->where('id', 2)->decrement('remain_overall_quantity ', 1); // BSC
}
else
{
DB::table('inventory')->where('id', 3)->decrement('remain_overall_quantity ', 1); // BFP
}
if you need to decrement by more than 1 then change the "1" in 'remain_overall_quantity ', 1 part
some insight to increment/decrement in Laravel:
https://laravel.com/docs/5.7/queries#increment-and-decrement