How to get last 7 days records with 0 counts - laravel

Question

I have an eloquent query that gets the total count records (created_at) of the last 7 days. But the problem is if one of these days have 0 records, this doesn't appear in the final data.
My query:
$data = Data::whereBetween('created_at', [Carbon::now()->subDays(6)->format('Y-m-d')." 00:00:00", Carbon::now()->format('Y-m-d')." 23:59:59"])
->groupBy('date')
->orderBy('date')
->get([
DB::raw('DATE(created_at) as date'),
DB::raw('count(*) as total')
])
->pluck('total', 'date')->toArray();
What I get:
[
"2020-04-14" => 1
"2020-04-16" => 1
"2020-04-18" => 1
"2020-04-19" => 1
]
What I expected:
[
"2020-04-14" => 1
"2020-04-15" => 0
"2020-04-16" => 1
"2020-04-17" => 0
"2020-04-18" => 1
"2020-04-19" => 1
"2020-04-20" => 0
]
Any suggestions?
SOLUTION:
-Based on Gary Houbre's proposal:
$results = Data::whereBetween('created_at', [Carbon::now()->subDays(6)->format('Y-m-d')." 00:00:00", Carbon::now()->format('Y-m-d')." 23:59:59"])
->groupBy('date')
->orderBy('date')
->get([
DB::raw('DATE_FORMAT(created_at, "%Y-%m-%d") as date'),
DB::raw('count(*) as total')
])
->keyBy('date')
->map(function ($item) {
$item->date = Carbon::parse($item->date);
return $item;
});
$period = new DatePeriod(Carbon::now()->subDays(6), CarbonInterval::day(), Carbon::now()->addDay());
$graph = array_map(function ($datePeriod) use ($results) {
$date = $datePeriod->format('Y-m-d');
return $results->has($date) ? $results->get($date)->total : 0;
}, iterator_to_array($period));

Answer 1

Looking directly Sql : How to include "zero" / "0" results in COUNT aggregate?
Into a same table : How to get the record if Count is zero in Laravel
You need to add an outer join into your request with Eloquent.

Answer 2

My idea is to create a for loop to check the days.
If there is no record on a date then print 0
Loop Iteration:
Catch the first Day (Suppose 14)
Catch the last Day
Then check in every iteration it is greater than one or many
Thus, I hope you will get normally.

Answer 3

We had a similar problem while trying to put back-end data into the chart. Since some of the days were missing it didn't look well. Our solution was;
Create a function like this;
public function generateDates(Date $startDate, Date $endDate, $format = 'Y/m/d'): Collection
{
$dates = collect();
$startDate = $startDate->copy();
for ($date = $startDate; $date->lte($endDate); $date->addDay()) {
$dates->put($date->format($format), 0);
}
return $dates;
}
In your case it's going to be (today and today - six days) and you will union returning collection with your query collection. What it does is; it create a date range from the keys and fill them with zero. When your query collection has some value other than zero - it is going to overwrite it.