Fix lastModified to be a string rather than an integer. (#355)

This fixes https://github.com/nextcloud/news/issues/350#issue-369283392

Signed-off-by: Detlev Zundel <dzu@member.fsf.org>

lib/Db/Feed.php

@@ -46,8 +46,8 @@ class Feed extends Entity implements IAPI, \JsonSerializable
     protected $articlesPerUpdate = 0;
     /** @var string|null */
     protected $httpLastModified = null;
-    /** @var int|null */
-    protected $lastModified = 0;
+    /** @var string|null */
+    protected $lastModified = '0';
     /** @var string|null */
     protected $httpEtag = null;
     /** @var string|null */
@@ -158,7 +158,7 @@ class Feed extends Entity implements IAPI, \JsonSerializable
     }
 
     /**
-     * @return int|null
+     * @return string|null
      */
     public function getLastModified()
     {
@@ -433,9 +433,9 @@ class Feed extends Entity implements IAPI, \JsonSerializable
     }
 
     /**
-     * @param int|null $lastModified
+     * @param string|null $lastModified
      */
-    public function setLastModified(int $lastModified = null)
+    public function setLastModified(string $lastModified = null)
     {
         if ($this->lastModified !== $lastModified) {
             $this->lastModified = $lastModified;

lib/Db/Folder.php

@@ -30,8 +30,8 @@ class Folder extends Entity implements IAPI, \JsonSerializable
     protected $opened = true;
     /** @var int|null */
     protected $deletedAt = 0;
-    /** @var int|null */
-    protected $lastModified = 0;
+    /** @var string|null */
+    protected $lastModified = '0';
 
     /**
      * @return int|null
@@ -47,7 +47,7 @@ class Folder extends Entity implements IAPI, \JsonSerializable
     }
 
     /**
-     * @return int|null
+     * @return string|null
      */
     public function getLastModified()
     {
@@ -110,7 +110,7 @@ class Folder extends Entity implements IAPI, \JsonSerializable
         }
     }
 
-    public function setLastModified(int $lastModified = null)
+    public function setLastModified(string $lastModified = null)
     {
 
         if ($this->lastModified !== $lastModified) {

lib/Db/Item.php

@@ -46,8 +46,8 @@ class Item extends Entity implements IAPI, \JsonSerializable
     protected $feedId;
     /** @var int */
     protected $status = 0;
-    /** @var int|null */
-    protected $lastModified = 0;
+    /** @var string|null */
+    protected $lastModified = '0';
     /** @var string|null */
     protected $searchIndex;
     /** @var bool */
@@ -181,7 +181,7 @@ class Item extends Entity implements IAPI, \JsonSerializable
     }
 
     /**
-     * @return int|null
+     * @return string|null
      */
     public function getLastModified()
     {
@@ -356,7 +356,7 @@ class Item extends Entity implements IAPI, \JsonSerializable
         }
     }
 
-    public function setLastModified(int $lastModified = null)
+    public function setLastModified(string $lastModified = null)
     {
         if ($this->lastModified !== $lastModified) {
             $this->lastModified = $lastModified;