laravel collection groupBy() / include empty results - laravel

Question

For a chart API I would need to provide the count of registered users per day.
//fetch all created_at dates of users from the last week
$signUpsLastWeek = User::whereDate('created_at', '>=', now()->subDays(7))->select('created_at')->get();
//group them now by date now, using collection operations
dd($signUpsLastWeek->groupBy(function($item) {
return $item->created_at->format('m.d');
}));
//now manipulate the collection a bit, so we get the date with the amount of new registered users
$signUpsLastWeek->mapWithKeys(function ($userGroup, $key) {
return [$key => $userGroup->count()];
})
Returns:
Illuminate\Database\Eloquent\Collection {#774 ▼
#items: array:1 [▼
"01.19" => 4
]
}
This works fine, a question is left.
In the example code above there are 0 new signups on the other days, meaning the collection should look something like:
Illuminate\Database\Eloquent\Collection {#774 ▼
#items: array:1 [▼
"01.25" => 0,
"01.24" => 0,
"01.23" => 0,
"01.22" => 0,
"01.20" => 0,
"01.19" => 4,
...,
]
}
Any idea how to include the 0 amounts too?

Answer 1

I think you can use CarbonPeriod to create the calendar and set the default count 0 for every date.
And then reset the value from your users' count:
$start_date = explode(' ', User::whereDate('created_at', '>=', now()->subDays(7))->min('created_at'))[0];
$end_date = \Carbon\Carbon::now()->format('Y-m-d');
$period = \Carbon\CarbonPeriod::create($start_date, $end_date);
$all_dates = [];
foreach ($period as $date) {
$all_dates = array_merge($all_dates, [$date->format('m.d') => 0]);
}
$all_dates = array_reverse($all_dates);
collect($all_dates)->mapWithKeys(function($v, $date) use ($signUpsLastWeek) {
if (in_array($date, array_keys($signUpsLastWeek))) {
return [$date => $signUpsLastWeek[$date]->count()];
} else {
return [$date => 0];
}
})->all();