Group hosts for multiple events

src/Service/Picker.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Service;
+
+use Tightenco\Collect\Support\Collection;
+
+class Picker
+{
+    /**
+     * The combined hosts for the retrieved events.
+     *
+     * @var \Tightenco\Collect\Support\Collection
+     */
+    private $hosts;
+
+    /**
+     * Picker constructor.
+     */
+    public function __construct()
+    {
+        $this->hosts = collect();
+    }
+
+    /**
+     * Retrieve the event hosts.
+     *
+     * @return \Tightenco\Collect\Support\Collection
+     */
+    public function getHosts(): Collection
+    {
+        return $this->hosts;
+    }
+
+    /**
+     * Set the hosts for the retrieved events.
+     *
+     * @param \Tightenco\Collect\Support\Collection $data
+     *   The event data.
+     *
+     * @return self
+     */
+    public function setHosts(Collection $data): self
+    {
+        $this->hosts = $data->pluck('hosts.*.host_name')
+            ->flatten(1)
+            ->unique()
+            ->sort();
+
+        return $this;
+    }
+}

tests/Service/PickerTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Tests\Service;
+
+use App\Service\Picker;
+use PHPUnit\Framework\TestCase;
+use Tightenco\Collect\Support\Collection;
+
+class PickerTest extends TestCase
+{
+    /** @test */
+    public function hosts_for_multiple_events_are_grouped_and_unique()
+    {
+        $data = [
+            [
+                'hosts' => [
+                    ['host_name' => 'Lee Stone'],
+                    ['host_name' => 'Dave Liddament'],
+                    ['host_name' => 'Kat Zien'],
+                ],
+            ],
+            [
+                'hosts' => [
+                    ['host_name' => 'Oliver Davies'],
+                    ['host_name' => 'Lee Stone'],
+                    ['host_name' => 'Lucia Velasco'],
+                    ['host_name' => 'Dave Liddament'],
+                ],
+            ],
+        ];
+
+        $picker = new Picker();
+        $picker->setHosts(collect($data));
+
+        $hosts = $picker->getHosts();
+        $this->assertInstanceOf(Collection::class, $hosts);
+        $this->assertCount(5, $hosts);
+    }
+}