Exclude event hosts

Automatically filter event hosts (i.e. organisers) from the RSVP list so
that they aren't potentially returned as winners.

Fixes #2

README.md

@@ -8,4 +8,4 @@ Run the `app:get-raffle-winner` command to retrieve the 'yes' RSVPs from Meetup
 
     ./bin/console app:get-raffle-winner <event_id>
 
-Currently, all 'yes' RSVPs are possible to be returned, including event hosts.
+RSVPs by event hosts (i.e. organisers) are automatically removed so that they are not returned.

src/Collection/EventCollection.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Collection;
+
+use Illuminate\Support\Arr;
+use Illuminate\Support\Collection;
+
+final class EventCollection extends Collection
+{
+    public function excludeEventHosts(): self
+    {
+        return (new self($this->items))->filter(function (array $rsvp): bool {
+            return !Arr::get($rsvp, 'member.event_context.host');
+        });
+    }
+
+}

src/Command/GetRaffleWinnerCommand.php

@@ -2,6 +2,7 @@
 
 namespace App\Command;
 
+use App\Collection\EventCollection;
 use DateInterval;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
@@ -96,7 +97,7 @@ class GetRaffleWinnerCommand extends Command
             $this->eventData['name']
        ));
 
-        $io->section(sprintf('%s \'yes\' RSVPs', $this->yesRsvps->count()));
+        $io->section(sprintf('%s \'yes\' RSVPs (excluding hosts)', $this->yesRsvps->count()));
         $io->listing($this->yesRsvps->pluck('member.name')->sort()->toArray());
         $io->success(
             sprintf('Winner: %s', Arr::get($this->winner, 'member.name'))
@@ -163,8 +164,10 @@ class GetRaffleWinnerCommand extends Command
                 )
             );
 
+            $this->rsvps = EventCollection::make($response->toArray())
+                ->excludeEventHosts();
+
             $rsvps->expiresAfter(DateInterval::createFromDateString('1 hour'));
-            $this->rsvps = new Collection($response->toArray());
             $this->cache->save($rsvps->set($this->rsvps));
         } else {
             $this->rsvps = $rsvps->get();