Laravel集合没有正确排序

Question

I try to sort my collection using Laravel function.

here is my data for example:

$collection = 
 [
  {
    "total_earned": "31739",
    "total_spent": "0",
    "total_amount": "317390",
    "date": "2015-10-01"
  }, {
    "total_earned": "212622",
    "total_spent": "86943",
    "total_amount": "2213165",
    "date": "2015-12-01"
  }, {
    "total_earned": 0,
    "total_spent": 0,
    "total_amount": 0,
    "date": "2015-10-29"
  }, {
    "total_earned": 0,
    "total_spent": 0,
    "total_amount": 0,
    "date": "2015-10-30"
  }
];

When I try to sort using Laravel sortBy function and return it become like this:

[{
    "total_earned": 0,
    "total_spent": 0,
    "total_amount": 0,
    "date": "2015-10-29"
}, {
    "total_earned": 0,
    "total_spent": 0,
    "total_amount": 0,
    "date": "2015-10-30"
}, {
    "total_earned": "212622",
    "total_spent": "86943",
    "total_amount": "2213165",
    "date": "2015-12-01"
}, {
    "total_earned": "31739",
    "total_spent": "0",
    "total_amount": "317390",
    "date": "2015-10-01"
}]

As you can see date 2015-10-01 is at bottom. It supposed to be before 2015-10-29 .

My code to sort:

return $transaction->sortBy('date')->values()->all();

Is this a bug or the sort suppose to be like that?

---

Update my entire code:

 $transaction = Transaction::dateRange($startDate->format('Ym-d'), $endDate->format('Ym-d')) ->groupBy('merchant_branch_id', DB::raw('DATE(created_at)')) ->selectRaw('DATE(created_at) as date, SUM(point_earned) as total_earned, SUM(point_spent) as total_spent, FLOOR(SUM(amount)) as total_amount') ->orderBy('created_at') ->get(); $convert = $transaction->map(function($item, $key) { $date = Carbon::parse($item->date)->format('Ym-d'); return [$date]; }); $convert = $convert->toArray(); $period = new DatePeriod($startDate, new DateInterval('P1D'), $endDate); foreach ($period as $row) { $date = $row->format('Ym-d'); if (!in_array_r($date, $convert)) { $transaction->push(['date' => $date, 'total_earned' => 0, 'total_spent' => 0, 'total_amount' => 0]); } } $sorted = $transaction->sortBy('date')->values()->all(); return $sorted; 

Answer 1

Just in case anyone else arrives at this question with the same problem, you can try with the following code from this answer https://stackoverflow.com/a/36170075/1208242 :

$sorted = $transaction->sortBy(function($col)
{
    return $col;
})->values()->all();

It might give you the dates in the wrong order (sortBy sorts in 'ascending' order by default, which apparently returns descending order when working with dates on Ymd format), so you could use sortByDesc() method instead