Laravel - Sortby date after GroupBy callback - laravel

Question

I'm creating a collection and using a groupBy to group items together depending on the month, however after this I then want to it to go back to ascending date order (Jan/Feb/Mar). Here is my function that I'm using below;
private function monthByMonthAgentReferrals() {
$case = Case::where('start_date', '>', Carbon::now()->subDays(360))
->where('source', 'AGENT')->get()
->groupBy(function($key) {
return Carbon::parse($key->start_date)->format('m');
});
return $case;
}
At the moment when I display the results I get a return of the months in a random order;
Collection {#1982 ▼
#items: array:12 [▼
12 => Collection {#1321 ▶}
"07" => Collection {#1322 ▶}
10 => Collection {#1320 ▶}
"05" => Collection {#1991 ▶}
"06" => Collection {#1990 ▶}
"08" => Collection {#1989 ▶}
"01" => Collection {#1988 ▶}
11 => Collection {#1987 ▶}
"09" => Collection {#1986 ▶}
"02" => Collection {#1985 ▶}
"03" => Collection {#1984 ▶}
"04" => Collection {#1983 ▶}
]
}
How would I go about sorting by 'start_date' again? or would it be better to sort by the array key? Thanks.

Answer 1

You can use it like this:
$case = Case::where('start_date', '>', Carbon::now()->subDays(360))
->selectRaw('table_name.*')
->where('source', 'AGENT')
->groupBy(function($key) {
return Carbon::parse($key->start_date)->format('m');
})->orderBy('start_date')->get();

Answer 2

private function monthByMonthAgentReferrals() {
$case = Case::where('start_date', '>', Carbon::now()->subDays(360))
->where('source', 'AGENT')->get()
->groupBy(function($key) {
return Carbon::parse($key->start_date)->format('m');
})->toArray();
ksort($case);
return collect($case);
}
Converts the collection to an array, use the function ksort on the array and then recollect the array.