Laravel 查询获取尚未存在真实数据的天的虚拟数据

Question

I've got a query in my Laravel project that returns a collection of data from my database between two dates, it's then grouped by the hour (but I can change this to my liking), I'd now like to return the "dates" for data before they existed in the database as a way of building up a list of dates that I can display in my web page, eve though there will be no data for these days, my chart would look consistent.

As an example:

• I want to see the past 30 days of data as a history, but the first 20 days of this period have no data yet, I still need to return the date keys for these days, except with just no data in them.

My current code is as follows (I'm using Carbon):

$uptimeData = UptimeChecks::where('user_id', 1)
                        ->where('monitor_id', 1)
                        ->where('checked_at', '>=', '2021-01-01 00:00:00')
                        ->where('checked_at', '<=', '2021-01-30 23:59:59')
                        ->orderBy('checked_at', 'asc')
                        ->select('event', 'checked_at')
                        ->get();

$from = Carbon::now()->subDays(60);
$period = CarbonPeriod::create($from, '2021-01-30 23:59:59');
$dates = $period->toArray();

foreach ($dates as $key => $date) {
  $dates[$key] = Carbon::parse($date)->format('Y-m-d');
}

$uptimeData = collect($uptimeData);
$uptimeData = $uptimeData->merge($dates);

$uptimeDataTimeline = $uptimeData->groupBy(function ($item, $key) {

  if (isset($item->checked_at)) {
    $date = Carbon::parse($item->checked_at);
  } else {
    $date = Carbon::parse($item);
  }

  return $date->format('Y-m-d');
});

Even though there would be no entries to display a "checked_at" column, can this be spoofed with the date for that day with no data?

Update 03/05 @ 20:30

I've updated my description to reflect the latest attempt to solve this problem, I appear to have constructed what I need, however, have some issues:

1. Where I'm looping over my $dates is there a way to build up some structure within each item so I don't have to do if/else checks on all my variables and keys?
2. For some reason, the "fake" dummy dates are being added after the real data, eg: 1st Jan, 2nd Jan, 30th Dec... how can I reverse this?

Answer 1

One way to achieve this is by creating a collection of the dates for the time period you want, and then merging the results of a query grouped by date into it.

Here's an example:

$from = '2021-01-01';
$to = '2021-01-31';

$period = CarbonPeriod::create($from, $to);
$dates = collect($period->toArray())->mapWithKeys(function ($date) {
  return [$date->format('Y-m-d') => []];
});

// $dates = ['2021-01-01' => [], '2021-01-02' => [], ...etc]

$uptimeChecks = UptimeChecks::query()
    ->where('user_id', 1)
    ->where('monitor_id', 1)
    ->whereBetween('checked_at', [$from, $to])
    ->orderBy('checked_at', 'asc')
    ->select('event', 'checked_at')
    ->get();

$uptimeDates = $uptimeChecks->groupBy(function ($item, $key) {
  return $item->checked_at->format('Y-m-d');
});

// $uptimeDates = ['2021-01-02' => ['event1', 'event2'], ...etc]

$uptimeData = $dates->merge($uptimeDates);

// $uptimeData = ['2021-01-01' => [], '2021-01-02' => ['event1', 'event2'], ...etc]

This assumes you are casting the checked_at field to a date in your UptimeChecks Model.