(Refactor) Count and Sum Queries

[HDVinnie]

Ideally we'd like to calculate these values using a single database query. What we were doing was not the case. The trick is to put conditions within aggregate functions. Here's an example in Query Builder that we are performing in this PR to combine multiple count or sum queries into one for better performance!

Calculating Totals Using Conditional Aggregates

Combine multiple count queries into one

- $total = Subscriber::count();
- $confirmed = Subscriber::where('status', 'confirmed')->count();
- $unconfirmed = Subscriber::where('status', 'unconfirmed')->count();
- $cancelled = Subscriber::where('status', 'cancelled')->count();
- $bounced = Subscriber::where('status', 'bounced')->count();

+ $totals = DB::table('subscribers')
+   ->selectRaw('count(*) as total')
+    ->selectRaw("count(case when status = 'confirmed' then 1 end) as confirmed")
+   ->selectRaw("count(case when status = 'unconfirmed' then 1 end) as unconfirmed")
+    ->selectRaw("count(case when status = 'cancelled' then 1 end) as cancelled")
+    ->selectRaw("count(case when status = 'bounced' then 1 end) as bounced")
+    ->first();

Which is then called in the view like so:

<div>Total: {{ $totals->total }}</div>
<div>Confirmed: {{ $totals->confirmed }}</div>
<div>Unconfirmed: {{ $totals->unconfirmed }}</div>
<div>Cancelled: {{ $totals->cancelled }}</div>
<div>Bounced: {{ $totals->bounced }}</div>

[codecov]

Codecov Report

Merging #1376 into master will decrease coverage by 1.45%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1376      +/-   ##
============================================
- Coverage     28.08%   26.62%   -1.46%     
  Complexity     4245     4245              
============================================
  Files           304      304              
  Lines         13346    13351       +5     
============================================
- Hits           3748     3555     -193     
- Misses         9598     9796     +198     

Impacted Files	Coverage Δ	Complexity Δ
app/Http/Controllers/RequestController.php	0.00% <0.00%> (ø)	90.00 <0.00> (ø)
app/Http/Controllers/Staff/HomeController.php	0.00% <0.00%> (ø)	3.00 <0.00> (ø)
app/Services/Data/Person.php	0.00% <0.00%> (-87.50%)	7.00% <0.00%> (ø%)
app/Services/Clients/TmdbClient.php	6.91% <0.00%> (-68.67%)	90.00% <0.00%> (ø%)
app/Services/Data/Genre.php	0.00% <0.00%> (-60.00%)	7.00% <0.00%> (ø%)
app/Helpers/TorrentHelper.php	30.00% <0.00%> (-30.00%)	10.00% <0.00%> (ø%)
app/Services/Clients/Client.php	62.06% <0.00%> (-24.14%)	15.00% <0.00%> (ø%)
app/Services/Data/Movie.php	17.46% <0.00%> (-15.88%)	40.00% <0.00%> (ø%)
app/Models/User.php	40.87% <0.00%> (-2.78%)	122.00% <0.00%> (ø%)
app/Http/Controllers/API/TorrentController.php	70.21% <0.00%> (-2.13%)	108.00% <0.00%> (ø%)
... and 3 more

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