More work on ordering

app/Traits/NextKey.php

@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Works out the next ID to use for an Eloquent Table.
+ */
+namespace App\Traits;
+
+trait NextKey
+{
+	public static function boot()
+	{
+		parent::boot();
+
+		static::creating(function($model)
+		{
+			$model->id = self::NextId();
+		});
+	}
+
+	public static function NextId()
+	{
+		return (new self)->max('id')+1;
+	}
+}