From b4f148060842eeebb08edb005978360767af3630 Mon Sep 17 00:00:00 2001
From: Benson Lee <benson.lee@gmail.com>
Date: Mon, 16 Oct 2017 09:11:46 -0700
Subject: [PATCH] Laravel 5.5.16 changes (#63)

---
 src/Illuminate/Support/Arr.php          |  2 +-
 src/Illuminate/Support/Collection.php   |  6 ++++--
 tests/Support/SupportCollectionTest.php | 11 +++++++++++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/Illuminate/Support/Arr.php b/src/Illuminate/Support/Arr.php
index 075ad68..a9e09ce 100644
--- a/src/Illuminate/Support/Arr.php
+++ b/src/Illuminate/Support/Arr.php
@@ -122,7 +122,7 @@ public static function dot($array, $prepend = '')
     }
 
     /**
-     * Get all of the given array except for a specified array of items.
+     * Get all of the given array except for a specified array of keys.
      *
      * @param  array  $array
      * @param  array|string  $keys
diff --git a/src/Illuminate/Support/Collection.php b/src/Illuminate/Support/Collection.php
index 1937a0f..1389879 100644
--- a/src/Illuminate/Support/Collection.php
+++ b/src/Illuminate/Support/Collection.php
@@ -34,7 +34,7 @@ class Collection implements ArrayAccess, Arrayable, Countable, IteratorAggregate
      */
     protected static $proxies = [
         'average', 'avg', 'contains', 'each', 'every', 'filter', 'first', 'flatMap',
-        'map', 'partition', 'reject', 'sortBy', 'sortByDesc', 'sum',
+        'keyBy', 'map', 'partition', 'reject', 'sortBy', 'sortByDesc', 'sum',
     ];
 
     /**
@@ -1055,7 +1055,9 @@ public function only($keys)
      */
     public function forPage($page, $perPage)
     {
-        return $this->slice(($page - 1) * $perPage, $perPage);
+        $offset = max(0, ($page - 1) * $perPage);
+
+        return $this->slice($offset, $perPage);
     }
 
     /**
diff --git a/tests/Support/SupportCollectionTest.php b/tests/Support/SupportCollectionTest.php
index 1de6fd2..2365217 100644
--- a/tests/Support/SupportCollectionTest.php
+++ b/tests/Support/SupportCollectionTest.php
@@ -307,6 +307,16 @@ public function testFilter()
         })->all());
     }
 
+    public function testHigherOrderKeyBy()
+    {
+        $c = new Collection([
+            ['id' => 'id1', 'name' => 'first'],
+            ['id' => 'id2', 'name' => 'second'],
+        ]);
+
+        $this->assertEquals(['id1' => 'first', 'id2' => 'second'], $c->keyBy->id->map->name->all());
+    }
+
     public function testHigherOrderFilter()
     {
         $c = new Collection([
@@ -1758,6 +1768,7 @@ public function testKeys()
     public function testPaginate()
     {
         $c = new Collection(['one', 'two', 'three', 'four']);
+        $this->assertEquals(['one', 'two'], $c->forPage(0, 2)->all());
         $this->assertEquals(['one', 'two'], $c->forPage(1, 2)->all());
         $this->assertEquals([2 => 'three', 3 => 'four'], $c->forPage(2, 2)->all());
         $this->assertEquals([], $c->forPage(3, 2)->all());