merge values into one collection using laravel - php

Question

I have a table only able to submit maximum two times on each qid.
first submit = 'submitted' on status column.
second submit = 'resubmitted' on status column.
id username qid amount status
1 john 2 150 submitted
2 john 2 120 resubmitted
3 david 2 100 submitted
4 david 2 80 resubmitted
I want to add the first amount on a collection like below so I can simply display both amounts on view.
"id" => 1
"username" => john
"amount" => "120.00"
**"first_amount" => "150.00"**
"status" => "resubmitted"
Blade:
#foreach($xxx as $x)
{{$x->amount}}
{{$x->first_amount}}
#endforeach
Is this possible?

Answer 1

You can load data once:
$collection = Model::get();
And then use the collection without executing any additional queries:
#foreach($collection->where('status', 'resubmitted') as $x)
{{ $x->amount }}
{{ $collection->where('status', 'submitted')->firstWhere('qid', $x->qid)->amount }}
#endforeach
Or you can rebuild the collection to add first_amount to it:
$collection = $a->where('status', 'resubmitted')->map(function($i) use($collection) {
$i['first_amount'] = $collection->where('status', 'submitted')->firstWhere('qid', $i['qid'])->amount;
return $i;
});

Answer 2

Add the "first_amount" column to the table with a default value of 0. Then it will be populated in the collection when you retrieve it. You can set the value of the "first_amount" when you insert the "resubmitted" rows.
It will also save you having to modify the collection to add a value into it.

Answer 3

You can do this in your query or transform the result (via collection).
One possible solution (via Collection) is:
$collection = (new Collection($data))->groupBy('username')->map(function($userItems, $username) {
$firstAmount = $userItems->where('status', 'submitted')->first();
return $userItems->map(function($data) use ($firstAmount) {
return array_replace_recursive($data, ['first_amount' => $firstAmount['amount']]);
});
})->flatten(1);
This will add the first amount to all results.
Another way is like Alexey posted. Basically you fetch the the "resubmitted" values and add the first_amount into it. But, this will be added only into "resubmitted" values (items with 'submitted' won't have the first_amount key).