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BUGFIX: Fixed potential data corruption issue when you are changing the class of a SiteTree subclass between two subclasses that share a fieldname.

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git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@97594 467b73ca-7a2a-4603-9d3b-597d59a354a9
This commit is contained in:
Sam Minnee 2010-01-26 10:03:43 +00:00
parent 46b9ce6988
commit 58cf79731b
2 changed files with 70 additions and 2 deletions
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37
core/model/DataObject.php
View File

@ -2459,6 +2459,12 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
$baseClass = array_shift($tableClasses);
// $collidingFields will keep a list fields that appear in mulitple places in the class
// heirarchy for this table. They will be dealt with more explicitly in the SQL query
// to ensure that junk data from other tables doesn't corrupt data objects
$collidingFields = array();
// Build our intial query
$query = new SQLQuery(array());
$query->from("\"$baseClass\"");
@ -2469,7 +2475,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
if(!in_array($k, array('ClassName', 'LastEdited', 'Created')) && ClassInfo::classImplements($v, 'CompositeDBField')) {
$this->dbObject($k)->addToQuery($query);
} else {
$query->select[] = "\"$baseClass\".\"$k\"";
$query->select[$k] = "\"$baseClass\".\"$k\"";
}
}
// Join all the tables
@ -2482,7 +2488,14 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
$compositeFields = self::composite_fields($tableClass, false);
if($databaseFields) foreach($databaseFields as $k => $v) {
if(!isset($compositeFields[$k])) {
$query->select[] = "\"$tableClass\".\"$k\"";
// Update $collidingFields if necessary
if(isset($query->select[$k])) {
if(!isset($collidingFields[$k])) $collidingFields[$k] = array($query->select[$k]);
$collidingFields[$k][] = "\"$tableClass\".\"$k\"";
} else {
$query->select[$k] = "\"$tableClass\".\"$k\"";
}
}
}
if($compositeFields) foreach($compositeFields as $k => $v) {
@ -2491,6 +2504,26 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
}
}
}
// Resolve colliding fields
if($collidingFields) {
foreach($collidingFields as $k => $collisions) {
$caseClauses = array();
foreach($collisions as $collision) {
if(preg_match('/^"([^"]+)"/', $collision, $matches)) {
$collisionBase = $matches[1];
$collisionClasses = ClassInfo::subclassesFor($collisionBase);
$caseClauses[] = "WHEN \"$baseClass\".\"ClassName\" IN ('"
. implode("', '", $collisionClasses) . "') THEN $collision";
} else {
user_error("Bad collision item '$collision'", E_USER_WARNING);
}
}
$query->select[$k] = "CASE " . implode( " ", $caseClauses) . " ELSE NULL END"
. " AS \"$k\"";
}
}
$query->select[] = "\"$baseClass\".\"ID\"";
$query->select[] = "CASE WHEN \"$baseClass\".\"ClassName\" IS NOT NULL THEN \"$baseClass\".\"ClassName\" ELSE '$baseClass' END AS \"RecordClassName\"";

35
tests/DataObjectTest.php
View File

@ -18,6 +18,41 @@ class DataObjectTest extends SapphireTest {
'DataObjectTest_Player',
);
function testDataIntegrityWhenTwoSubclassesHaveSameField() {
// Save data into DataObjectTest_SubTeam.SubclassDatabaseField
$obj = new DataObjectTest_SubTeam();
$obj->SubclassDatabaseField = "obj-SubTeam";
$obj->write();
// Change the class
$obj->ClassName = 'OtherSubclassWithSameField';
$obj->write();
$obj->flushCache();
// Re-fetch from the database and confirm that the data is sourced from
// OtherSubclassWithSameField.SubclassDatabaseField
$obj = DataObject::get_by_id('DataObjectTest_Team', $obj->ID);
$this->assertNull($obj->SubclassDatabaseField);
// Confirm that save the object in the other direction.
$obj->SubclassDatabaseField = 'obj-Other';
$obj->write();
$obj->ClassName = 'DataObjectTest_SubTeam';
$obj->write();
$obj->flushCache();
// If we restore the class, the old value has been lying dormant and will be available again.
// NOTE: This behaviour is volatile; we may change this in the future to clear fields that
// are no longer relevant when changing ClassName
$obj = DataObject::get_by_id('DataObjectTest_Team', $obj->ID);
$this->assertEquals('obj-SubTeam', $obj->SubclassDatabaseField);
}
/**
* Test deletion of DataObjects
* - Deleting using delete() on the DataObject