Change idea author when post author changes

event/listener.php

@@ -91,6 +91,7 @@ public static function getSubscribedEvents()
 			'core.posting_modify_template_vars'			=> 'submit_idea_template',
 			'core.posting_modify_submit_post_before'	=> 'submit_idea_before',
 			'core.posting_modify_submit_post_after'		=> [['submit_idea_after'], ['edit_idea_title']],
+			'core.mcp_change_poster_after'				=> 'change_idea_author',
 		);
 	}
 
@@ -390,6 +391,28 @@ public function edit_idea_title($event)
 		$this->idea->set_title($idea['idea_id'], $event['post_data']['post_subject']);
 	}
 
+	/**
+	 * Change an idea's author when the post author is changed
+	 *
+	 * @param \phpbb\event\data $event The event object
+	 * @return void
+	 */
+	public function change_idea_author($event)
+	{
+		$forum_id = (int) $event['post_info']['forum_id'];
+		$topic_id = (int) $event['post_info']['topic_id'];
+		$old_author_id = (int) $event['post_info']['poster_id'];
+		$new_author_id = (int) $event['userdata']['user_id'];
+
+		if ($old_author_id === $new_author_id || !$this->is_ideas_forum($forum_id))
+		{
+			return;
+		}
+
+		$idea = $this->idea->get_idea_by_topic_id($topic_id);
+		$this->idea->set_author($idea['idea_id'], $new_author_id);
+	}
+
 	/**
 	 * Test if we are on the posting page for a new idea
 	 *

factory/idea.php

@@ -227,6 +227,29 @@ public function get_title($id)
 		return $idea_title ?: '';
 	}
 
+	/**
+	 * Set the author of an idea
+	 *
+	 * @param int $idea_id
+	 * @param int $user_id
+	 * @return bool True if set, false if invalid.
+	 */
+	public function set_author($idea_id, $user_id)
+	{
+		if (!$user_id || !is_numeric($user_id))
+		{
+			return false;
+		}
+
+		$sql_ary = array(
+			'idea_author' => (int) $user_id,
+		);
+
+		$this->update_idea_data($sql_ary, $idea_id, $this->table_ideas);
+
+		return true;
+	}
+
 	/**
 	 * Submit new idea data to the ideas table
 	 *

tests/event/listener_test.php

@@ -115,6 +115,7 @@ public function test_getSubscribedEvents()
 			'core.posting_modify_template_vars',
 			'core.posting_modify_submit_post_before',
 			'core.posting_modify_submit_post_after',
+			'core.mcp_change_poster_after',
 		), array_keys(\phpbb\ideas\event\listener::getSubscribedEvents()));
 	}
 
@@ -672,6 +673,57 @@ public function test_submit_idea($mode, $forum_id, $topic_id, $approved, $succes
 
 		$listener->submit_idea_after($event);
 	}
+
+	/**
+	 * Data set for change_idea_author
+	 *
+	 * @return array Array of test data
+	 */
+	public function change_idea_author_data()
+	{
+		return [
+			[2, 1, 1, 2, true], // Valid: ideas forum, different authors
+			[1, 1, 1, 2, false], // Invalid: not ideas forum
+			[2, 1, 1, 1, false], // Invalid: same author
+		];
+	}
+
+	/**
+	 * Test the change_idea_author event
+	 *
+	 * @dataProvider change_idea_author_data
+	 */
+	public function test_change_idea_author($forum_id, $topic_id, $old_author_id, $new_author_id, $should_update)
+	{
+		$listener = $this->get_listener();
+
+		$event = new \phpbb\event\data([
+			'post_info' => [
+				'forum_id' => $forum_id,
+				'topic_id' => $topic_id,
+				'poster_id' => $old_author_id,
+			],
+			'userdata' => [
+				'user_id' => $new_author_id,
+			],
+		]);
+
+		$idea_data = [
+			'idea_id' => 1,
+			'idea_author' => $old_author_id,
+		];
+
+		$this->idea->expects($should_update ? self::once() : self::never())
+			->method('get_idea_by_topic_id')
+			->with($topic_id)
+			->willReturn($idea_data);
+
+		$this->idea->expects($should_update ? self::once() : self::never())
+			->method('set_author')
+			->with(1, $new_author_id);
+
+		$listener->change_idea_author($event);
+	}
 }
 
 /**

tests/ideas/idea_attributes_test.php

@@ -111,6 +111,7 @@ public function idea_attribute_test_data()
 			array(
 				array(
 					'idea_id'		=> 1,
+					'idea_author'	=> 2,
 					'duplicate_id'	=> 2,
 					'rfc_link'		=> 'https://area51.phpbb.com/phpBB/viewtopic.php?foo&bar',
 					'implemented_version' => '3.1.0',
@@ -121,6 +122,7 @@ public function idea_attribute_test_data()
 			array(
 				array(
 					'idea_id'		=> 2,
+					'idea_author'	=> 3,
 					'duplicate_id'	=> 1,
 					'rfc_link'		=> 'https://area51.phpbb.com/phpBB/viewtopic.php?bar&foo',
 					'implemented_version' => '3.2.0',
@@ -131,6 +133,7 @@ public function idea_attribute_test_data()
 			array(
 				array(
 					'idea_id'		=> 3,
+					'idea_author'	=> 4,
 					'duplicate_id'	=> '5',
 					'rfc_link'		=> '',
 					'implemented_version' => '',
@@ -141,6 +144,7 @@ public function idea_attribute_test_data()
 			array(
 				array(
 					'idea_id'		=> 4,
+					'idea_author'	=> '',
 					'duplicate_id'	=> 'foo',
 					'rfc_link'		=> 'https://www.phpbb.com/phpBB/viewtopic.php?foo',
 					'implemented_version' => 'foo',
@@ -151,6 +155,7 @@ public function idea_attribute_test_data()
 			array(
 				array(
 					'idea_id'		=> 5,
+					'idea_author'	=> 'foo',
 					'duplicate_id'	=> array(1),
 					'rfc_link'		=> 'foobar',
 					'implemented_version' => '1',
@@ -211,6 +216,16 @@ public function test_set_title($data, $expected)
 		$this->set_attribute_test('set_title', 'idea_title', $data, $expected);
 	}
 
+	/**
+	 * Test set_author()
+	 *
+	 * @dataProvider idea_attribute_test_data
+	 */
+	public function test_set_author($data, $expected)
+	{
+		$this->set_attribute_test('set_author', 'idea_author', $data, $expected);
+	}
+
 	/**
 	 * Set attribute test runner
 	 *