FIXED: Issue where temporary table would cause unpredictable behaviour. Temporary table functionality was substituted with subqueries in each use case.

ADDED: Test case for version archive functionality.

model/Versioned.php

@@ -160,10 +160,19 @@ class Versioned extends DataExtension {
 			}
 
 			// Link to the version archived on that date
-			$archiveTable = $this->requireArchiveTempTable($baseTable, $date);
+			$safeDate = Convert::raw2sql($date);
-			$query->addFrom(array($archiveTable => "INNER JOIN \"$archiveTable\"
+			$query->addWhere(
-				ON \"$archiveTable\".\"ID\" = \"{$baseTable}_versions\".\"RecordID\" 
+					"`{$baseTable}_versions`.`Version` IN 
-				AND \"$archiveTable\".\"Version\" = \"{$baseTable}_versions\".\"Version\""));
+					(SELECT LatestVersion FROM 
+						(SELECT 
+							`{$baseTable}_versions`.`RecordID`, 
+							MAX(`{$baseTable}_versions`.`Version`) AS LatestVersion
+							FROM `{$baseTable}_versions`
+							WHERE `{$baseTable}_versions`.`LastEdited` <= '$safeDate'
+							GROUP BY `{$baseTable}_versions`.`RecordID`
+						) AS `{$baseTable}_versions_latest`
+						WHERE `{$baseTable}_versions_latest`.`RecordID` = `{$baseTable}_versions`.`RecordID`
+					)");
 			break;
 		
 		// Reading a specific stage (Stage or Live)
@@ -204,10 +213,18 @@ class Versioned extends DataExtension {
 			// Return latest version instances, regardless of whether they are on a particular stage
 			// This provides "show all, including deleted" functonality
 			if($dataQuery->getQueryParam('Versioned.mode') == 'latest_versions') {
-				$archiveTable = self::requireArchiveTempTable($baseTable);
+				$query->addWhere(
-				$query->addInnerJoin($archiveTable, "\"$archiveTable\".\"ID\" = \"{$baseTable}_versions\".\"RecordID\" AND \"$archiveTable\".\"Version\" = \"{$baseTable}_versions\".\"Version\"");
+					"`{$alias}_versions`.`Version` IN 
+					(SELECT LatestVersion FROM 
+						(SELECT 
+							`{$alias}_versions`.`RecordID`, 
+							MAX(`{$alias}_versions`.`Version`) AS LatestVersion
+							FROM `{$alias}_versions`
+							GROUP BY `{$alias}_versions`.`RecordID`
+						) AS `{$alias}_versions_latest`
+						WHERE `{$alias}_versions_latest`.`RecordID` = `{$alias}_versions`.`RecordID`
+					)");
 			}
-
 			break;
 		default:
 			throw new InvalidArgumentException("Bad value for query parameter Versioned.mode: " . $dataQuery->getQueryParam('Versioned.mode'));
@@ -234,34 +251,6 @@ class Versioned extends DataExtension {
 		// Remove references to them
 		self::$archive_tables = array();
 	}
-	
-	/**
-	 * Create a temporary table mapping each database record to its version on the given date.
-	 * This is used by the versioning system to return database content on that date.
-	 * @param string $baseTable The base table.
-	 * @param string $date The date.  If omitted, then the latest version of each page will be returned.
-	 * @todo Ensure that this is DB abstracted
-	 */
-	protected static function requireArchiveTempTable($baseTable, $date = null) {
-		if(!isset(self::$archive_tables[$baseTable])) {
-			self::$archive_tables[$baseTable] = DB::createTable("_Archive$baseTable", array(
-				"ID" => "INT NOT NULL",
-				"Version" => "INT NOT NULL",
-			), null, array('temporary' => true));
-		}
-		
-		if(!DB::query("SELECT COUNT(*) FROM \"" . self::$archive_tables[$baseTable] . "\"")->value()) {
-			if($date) $dateClause = "WHERE \"LastEdited\" <= '$date'";
-			else $dateClause = "";
-
-			DB::query("INSERT INTO \"" . self::$archive_tables[$baseTable] . "\"
-				SELECT \"RecordID\", max(\"Version\") FROM \"{$baseTable}_versions\"
-				$dateClause
-				GROUP BY \"RecordID\"");
-		}
-		
-		return self::$archive_tables[$baseTable];
-	}
 
 	/**
 	 * An array of DataObject extensions that may require versioning for extra tables

tests/model/VersionedTest.php

@@ -266,6 +266,59 @@ class VersionedTest extends SapphireTest {
 		$this->assertInstanceOf("VersionedTest_DataObject", $obj3);
 
 	}
+	
+	public function testArchiveVersion() {
+		
+		// In 2005 this file was created
+		SS_Datetime::set_mock_now('2005-01-01 00:00:00');
+		$testPage = new VersionedTest_Subclass();
+		$testPage->Title = 'Archived page';
+		$testPage->Content = 'This is the content from 2005';
+		$testPage->ExtraField = '2005';
+		$testPage->write();
+		$testPage->publish('Stage', 'Live');
+		
+		// In 2007 we updated it
+		SS_Datetime::set_mock_now('2007-01-01 00:00:00');
+		$testPage->Content = "It's 2007 already!";
+		$testPage->ExtraField = '2007';
+		$testPage->write();
+		$testPage->publish('Stage', 'Live');
+		
+		// In 2009 we updated it again
+		SS_Datetime::set_mock_now('2009-01-01 00:00:00');
+		$testPage->Content = "I'm enjoying 2009";
+		$testPage->ExtraField = '2009';
+		$testPage->write();
+		$testPage->publish('Stage', 'Live');
+		
+		// End mock, back to the present day:)
+		SS_Datetime::clear_mock_now();
+		
+		// Test 1 - 2006 Content
+		singleton('VersionedTest_Subclass')->flushCache(true);
+		Versioned::set_reading_mode('Archive.2006-01-01 00:00:00');
+		$testPage2006 = DataObject::get('VersionedTest_Subclass')->filter(array('Title' => 'Archived page'))->first();
+		$this->assertInstanceOf("VersionedTest_Subclass", $testPage2006);
+		$this->assertEquals("2005", $testPage2006->ExtraField);
+		$this->assertEquals("This is the content from 2005", $testPage2006->Content);
+		
+		// Test 2 - 2008 Content
+		singleton('VersionedTest_Subclass')->flushCache(true);
+		Versioned::set_reading_mode('Archive.2008-01-01 00:00:00');
+		$testPage2008 = DataObject::get('VersionedTest_Subclass')->filter(array('Title' => 'Archived page'))->first();
+		$this->assertInstanceOf("VersionedTest_Subclass", $testPage2008);
+		$this->assertEquals("2007", $testPage2008->ExtraField);
+		$this->assertEquals("It's 2007 already!", $testPage2008->Content);
+		
+		// Test 3 - Today
+		singleton('VersionedTest_Subclass')->flushCache(true);
+		Versioned::set_reading_mode('Stage.Stage');
+		$testPageCurrent = DataObject::get('VersionedTest_Subclass')->filter(array('Title' => 'Archived page'))->first();
+		$this->assertInstanceOf("VersionedTest_Subclass", $testPageCurrent);
+		$this->assertEquals("2009", $testPageCurrent->ExtraField);
+		$this->assertEquals("I'm enjoying 2009", $testPageCurrent->Content);
+	}
 }
 
 class VersionedTest_DataObject extends DataObject implements TestOnly {