SQL: update request for updated articles

https://github.com/FreshRSS/FreshRSS/issues/798

app/Controllers/feedController.php

@@ -343,7 +343,7 @@ class FreshRSS_feed_Controller extends Minz_ActionController {
 						} else {	//This entry already exists but has been updated
 							Minz_Log::debug('Entry with GUID `' . $entry->guid() . '` updated in feed ' . $feed->id() .
 								', old hash ' . $existingHash . ', new hash ' . $entry->hash());
-							$entry->_isRead($is_read);	//Reset is_read
+							$entry->_isRead(null);	//Change is_read according to policy. //TODO: Implement option
 							if (!$entryDAO->hasTransaction()) {
 								$entryDAO->beginTransaction();
 							}

app/Models/Entry.php

@@ -15,7 +15,7 @@ class FreshRSS_Entry extends Minz_Model {
 	private $link;
 	private $date;
 	private $hash = null;
-	private $is_read;
+	private $is_read;	//Nullable boolean
 	private $is_favorite;
 	private $feed;
 	private $tags;
@@ -125,7 +125,7 @@ class FreshRSS_Entry extends Minz_Model {
 		$this->date = $value > 1 ? $value : time();
 	}
 	public function _isRead($value) {
-		$this->is_read = $value;
+		$this->is_read = $value === null ? null : (bool)$value;
 	}
 	public function _isFavorite($value) {
 		$this->is_favorite = $value;

app/Models/EntryDAO.php

@@ -91,11 +91,17 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	private $updateEntryPrepared = null;
 
 	public function updateEntry($valuesTmp) {
+		if (!isset($valuesTmp['is_read'])) {
+			$valuesTmp['is_read'] = null;
+		}
+
 		if ($this->updateEntryPrepared === null) {
 			$sql = 'UPDATE `' . $this->prefix . 'entry` '
 			     . 'SET title=?, author=?, '
 			     . ($this->isCompressed() ? 'content_bin=COMPRESS(?)' : 'content=?')
-			     . ', link=?, date=?, lastSeen=?, hash=X?, is_read=?, tags=? '
+			     . ', link=?, date=?, lastSeen=?, hash=X?, '
+			     . ($valuesTmp['is_read'] === null ? '' : 'is_read=?, ')
+			     . 'tags=? '
 			     . 'WHERE id_feed=? AND guid=?';
 			$this->updateEntryPrepared = $this->bd->prepare($sql);
 		}
@@ -108,11 +114,15 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			$valuesTmp['date'],
 			time(),
 			$valuesTmp['hash'],
-			$valuesTmp['is_read'] ? 1 : 0,
+		);
+		if ($valuesTmp['is_read'] !== null) {
+			$values[] = $valuesTmp['is_read'] ? 1 : 0;
+		}
+		$values = array_merge($values, array(
 			substr($valuesTmp['tags'], 0, 1023),
 			$valuesTmp['id_feed'],
 			substr($valuesTmp['guid'], 0, 760),
-		);
+		));
 
 		if ($this->updateEntryPrepared && $this->updateEntryPrepared->execute($values)) {
 			return $this->bd->lastInsertId();