chamilo-lms2/vendor/doctrine/orm/UPGRADE.md

Upgrade to 2.3

EntityManager#find() not calls EntityRepository#find() anymore

Previous to 2.3, calling EntityManager#find() would be delegated to EntityRepository#find(). This has lead to some unexpected behavior in the core of Doctrine when people have overwritten the find method in their repositories. That is why this behavior has been reversed in 2.3, and EntityRepository#find() calls EntityManager#find() instead.

EntityGenerator add*() method generation

When generating an add*() method for a collection the EntityGenerator will now not use the Type-Hint to get the singular for the collection name, but use the field-name and strip a trailing "s" character if there is one.

Merge copies non persisted properties too

When merging an entity in UoW not only mapped properties are copied, but also others.

Query, QueryBuilder and NativeQuery parameters BC break

From now on, parameters in queries is an ArrayCollection instead of a simple array. This affects heavily the usage of setParameters(), because it will not append anymore parameters to query, but will actually override the already defined ones. Whenever you are retrieving a parameter (ie. $query->getParameter(1)), you will receive an instance of Query\Parameter, which contains the methods "getName", "getValue" and "getType". Parameters are also only converted to when necessary, and not when they are set.

Also, related functions were affected:

• execute($parameters, $hydrationMode) the argument $parameters can be either an key=>value array or an ArrayCollection instance
• iterate($parameters, $hydrationMode) the argument $parameters can be either an key=>value array or an ArrayCollection instance
• setParameters($parameters) the argument $parameters can be either an key=>value array or an ArrayCollection instance
• getParameters() now returns ArrayCollection instead of array
• getParameter($key) now returns Parameter instance instead of parameter value

Query TreeWalker method renamed

Internal changes were made to DQL and SQL generation. If you have implemented your own TreeWalker, you probably need to update it. The method walkJoinVariableDeclaration is now named walkJoin.

Metadata Drivers

Metadata drivers have been rewritten to reuse code from Doctrine\Common. Anyone who is using the Doctrine\ORM\Mapping\Driver\Driver interface should instead refer to Doctrine\Common\Persistence\Mapping\Driver\MappingDriver. Same applies to Doctrine\ORM\Mapping\Driver\AbstractFileDriver: you should now refer to Doctrine\Common\Persistence\Mapping\Driver\FileDriver.

Also, following mapping drivers have been deprecated, please use their replacements in Doctrine\Common as listed:

• Doctrine\ORM\Mapping\Driver\DriverChain => Doctrine\Common\Persistence\Mapping\Driver\MappingDriverChain
• Doctrine\ORM\Mapping\Driver\PHPDriver => Doctrine\Common\Persistence\Mapping\Driver\PHPDriver
• Doctrine\ORM\Mapping\Driver\StaticPHPDriver => Doctrine\Common\Persistence\Mapping\Driver\StaticPHPDriver

Upgrade to 2.2

ResultCache implementation rewritten

The result cache is completely rewritten and now works on the database result level, not inside the ORM AbstractQuery anymore. This means that for result cached queries the hydration will now always be performed again, regardless of the hydration mode. Affected areas are:

1. Fixes the problem that entities coming from the result cache were not registered in the UnitOfWork leading to problems during EntityManager#flush. Calls to EntityManager#merge are not necessary anymore.
2. Affects the array hydrator which now includes the overhead of hydration compared to caching the final result.

The API is backwards compatible however most of the getter methods on the AbstractQuery object are now deprecated in favor of calling AbstractQuery#getQueryCacheProfile(). This method returns a Doctrine\DBAL\Cache\QueryCacheProfile instance with access to result cache driver, lifetime and cache key.

EntityManager#getPartialReference() creates read-only entity

Entities returned from EntityManager#getPartialReference() are now marked as read-only if they haven't been in the identity map before. This means objects of this kind never lead to changes in the UnitOfWork.

Fields omitted in a partial DQL query or a native query are never updated

Fields of an entity that are not returned from a partial DQL Query or native SQL query will never be updated through an UPDATE statement.

Removed support for onUpdate in @JoinColumn

The onUpdate foreign key handling makes absolutely no sense in an ORM. Additionally Oracle doesn't even support it. Support for it is removed.

Changes in Annotation Handling

There have been some changes to the annotation handling in Common 2.2 again, that affect how people with old configurations from 2.0 have to configure the annotation driver if they don't use Configuration::newDefaultAnnotationDriver():

// Register the ORM Annotations in the AnnotationRegistry
AnnotationRegistry::registerFile('path/to/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php');

$reader = new \Doctrine\Common\Annotations\SimpleAnnotationReader();
$reader->addNamespace('Doctrine\ORM\Mapping');
$reader = new \Doctrine\Common\Annotations\CachedReader($reader, new ArrayCache());

$driver = new AnnotationDriver($reader, (array)$paths);

$config->setMetadataDriverImpl($driver);

Scalar mappings can now be ommitted from DQL result

You are now allowed to mark scalar SELECT expressions as HIDDEN an they are not hydrated anymore. Example:

SELECT u, SUM(a.id) AS HIDDEN numArticles FROM User u LEFT JOIN u.Articles a ORDER BY numArticles DESC HAVING numArticles > 10

Your result will be a collection of Users, and not an array with key 0 as User object instance and "numArticles" as the number of articles per user

Map entities as scalars in DQL result

When hydrating to array or even a mixed result in object hydrator, previously you had the 0 index holding you entity instance. You are now allowed to alias this, providing more flexibility for you code. Example:

SELECT u AS user FROM User u

Will now return a collection of arrays with index "user" pointing to the User object instance.

Performance optimizations

Thousands of lines were completely reviewed and optimized for best performance. Removed redundancy and improved code readability made now internal Doctrine code easier to understand. Also, Doctrine 2.2 now is around 10-15% faster than 2.1.

EntityManager#find(null)

Previously EntityManager#find(null) returned null. It now throws an exception.

Upgrade to 2.1

Interface for EntityRepository

The EntityRepository now has an interface Doctrine\Common\Persistence\ObjectRepository. This means that your classes that override EntityRepository and extend find(), findOneBy() or findBy() must be adjusted to follow this interface.

AnnotationReader changes

The annotation reader was heavily refactored between 2.0 and 2.1-RC1. In theory the operation of the new reader should be backwards compatible, but it has to be setup differently to work that way:

// new call to the AnnotationRegistry
\Doctrine\Common\Annotations\AnnotationRegistry::registerFile('/doctrine-src/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php');

$reader = new \Doctrine\Common\Annotations\AnnotationReader();
$reader->setDefaultAnnotationNamespace('Doctrine\ORM\Mapping\\');
// new code necessary starting here
$reader->setIgnoreNotImportedAnnotations(true);
$reader->setEnableParsePhpImports(false);
$reader = new \Doctrine\Common\Annotations\CachedReader(
    new \Doctrine\Common\Annotations\IndexedReader($reader), new ArrayCache()
);

This is already done inside the $config->newDefaultAnnotationDriver, so everything should automatically work if you are using this method. You can verify if everything still works by executing a console command such as schema-validate that loads all metadata into memory.

Update from 2.0-BETA3 to 2.0-BETA4

XML Driver element demoted to attribute

We changed how the XML Driver allows to define the change-tracking-policy. The working case is now:

<entity change-tracking-policy="DEFERRED_IMPLICT" />

Update from 2.0-BETA2 to 2.0-BETA3

Serialization of Uninitialized Proxies

As of Beta3 you can now serialize uninitialized proxies, an exception will only be thrown when trying to access methods on the unserialized proxy as long as it has not been re-attached to the EntityManager using EntityManager#merge(). See this example:

$proxy = $em->getReference('User', 1);

$serializedProxy = serialize($proxy);
$detachedProxy = unserialized($serializedProxy);

echo $em->contains($detachedProxy); // FALSE

try {
    $detachedProxy->getId(); // uninitialized detached proxy
} catch(Exception $e) {

}
$attachedProxy = $em->merge($detachedProxy);
echo $attackedProxy->getId(); // works!

Changed SQL implementation of Postgres and Oracle DateTime types

The DBAL Type "datetime" included the Timezone Offset in both Postgres and Oracle. As of this version they are now generated without Timezone (TIMESTAMP WITHOUT TIME ZONE instead of TIMESTAMP WITH TIME ZONE). See this comment to Ticket DBAL-22 for more details as well as migration issues for PostgreSQL and Oracle.

Both Postgres and Oracle will throw Exceptions during hydration of Objects with "DateTime" fields unless migration steps are taken!

Removed multi-dot/deep-path expressions in DQL

The support for implicit joins in DQL through the multi-dot/Deep Path Expressions was dropped. For example:

SELECT u FROM User u WHERE u.group.name = ?1

See the "u.group.id" here is using multi dots (deep expression) to walk through the graph of objects and properties. Internally the DQL parser would rewrite these queries to:

SELECT u FROM User u JOIN u.group g WHERE g.name = ?1

This explicit notation will be the only supported notation as of now. The internal handling of multi-dots in the DQL Parser was very complex, error prone in edge cases and required special treatment for several features we added. Additionally it had edge cases that could not be solved without making the DQL Parser even much more complex. For this reason we will drop the support for the deep path expressions to increase maintainability and overall performance of the DQL parsing process. This will benefit any DQL query being parsed, even those not using deep path expressions.

Note that the generated SQL of both notations is exactly the same! You don't loose anything through this.

Default Allocation Size for Sequences

The default allocation size for sequences has been changed from 10 to 1. This step was made to not cause confusion with users and also because it is partly some kind of premature optimization.

Update from 2.0-BETA1 to 2.0-BETA2

There are no backwards incompatible changes in this release.

Upgrade from 2.0-ALPHA4 to 2.0-BETA1

EntityRepository deprecates access to protected variables

Instead of accessing protected variables for the EntityManager in a custom EntityRepository it is now required to use the getter methods for all the three instance variables:

• $this->_em now accessible through $this->getEntityManager()
• $this->_class now accessible through $this->getClassMetadata()
• $this->_entityName now accessible through $this->getEntityName()

Important: For Beta 2 the protected visibility of these three properties will be changed to private!

Console migrated to Symfony Console

The Doctrine CLI has been replaced by Symfony Console Configuration

Instead of having to specify:

[php]
$cliConfig = new CliConfiguration();
$cliConfig->setAttribute('em', $entityManager);

You now have to configure the script like:

[php]
$helperSet = new \Symfony\Components\Console\Helper\HelperSet(array(
    'db' => new \Doctrine\DBAL\Tools\Console\Helper\ConnectionHelper($em->getConnection()),
    'em' => new \Doctrine\ORM\Tools\Console\Helper\EntityManagerHelper($em)
));

Console: No need for Mapping Paths anymore

In previous versions you had to specify the --from and --from-path options to show where your mapping paths are from the console. However this information is already known from the Mapping Driver configuration, so the requirement for this options were dropped.

Instead for each console command all the entities are loaded and to restrict the operation to one or more sub-groups you can use the --filter flag.

AnnotationDriver is not a default mapping driver anymore

In conjunction with the recent changes to Console we realized that the annotations driver being a default metadata driver lead to lots of glue code in the console components to detect where entities lie and how to load them for batch updates like SchemaTool and other commands. However the annotations driver being a default driver does not really help that much anyways.

Therefore we decided to break backwards compability in this issue and drop the support for Annotations as Default Driver and require our users to specify the driver explicitly (which allows us to ask for the path to all entities).

If you are using the annotations metadata driver as default driver, you have to add the following lines to your bootstrap code:

$driverImpl = $config->newDefaultAnnotationDriver(array(__DIR__."/Entities"));
$config->setMetadataDriverImpl($driverImpl);

You have to specify the path to your entities as either string of a single path or array of multiple paths to your entities. This information will be used by all console commands to access all entities.

Xml and Yaml Drivers work as before!

New inversedBy attribute

It is now mandatory that the owning side of a bidirectional association specifies the 'inversedBy' attribute that points to the name of the field on the inverse side that completes the association. Example:

[php]
// BEFORE (ALPHA4 AND EARLIER)
class User
{
    //...
    /** @OneToOne(targetEntity="Address", mappedBy="user") */
    private $address;
    //...
}
class Address
{
    //...
    /** @OneToOne(targetEntity="User") */
    private $user;
    //...
}

// SINCE BETA1
// User class DOES NOT CHANGE
class Address
{
    //...
    /** @OneToOne(targetEntity="User", inversedBy="address") */
    private $user;
    //...
}

Thus, the inversedBy attribute is the counterpart to the mappedBy attribute. This change was necessary to enable some simplifications and further performance improvements. We apologize for the inconvenience.

Default Property for Field Mappings

The "default" option for database column defaults has been removed. If desired, database column defaults can be implemented by using the columnDefinition attribute of the @Column annotation (or the approriate XML and YAML equivalents). Prefer PHP default values, if possible.

Selecting Partial Objects

Querying for partial objects now has a new syntax. The old syntax to query for partial objects now has a different meaning. This is best illustrated by an example. If you previously had a DQL query like this:

[sql]
SELECT u.id, u.name FROM User u

Since BETA1, simple state field path expressions in the select clause are used to select object fields as plain scalar values (something that was not possible before). To achieve the same result as previously (that is, a partial object with only id and name populated) you need to use the following, explicit syntax:

[sql]
SELECT PARTIAL u.{id,name} FROM User u

XML Mapping Driver

The 'inheritance-type' attribute changed to take last bit of ClassMetadata constant names, i.e. NONE, SINGLE_TABLE, INHERITANCE_TYPE_JOINED

YAML Mapping Driver

The way to specify lifecycle callbacks in YAML Mapping driver was changed to allow for multiple callbacks per event. The Old syntax ways:

[yaml]
lifecycleCallbacks:
  doStuffOnPrePersist: prePersist
  doStuffOnPostPersist: postPersist

The new syntax is:

[yaml]
lifecycleCallbacks:
  prePersist: [ doStuffOnPrePersist, doOtherStuffOnPrePersistToo ]
  postPersist: [ doStuffOnPostPersist ]

PreUpdate Event Listeners

Event Listeners listening to the 'preUpdate' event can only affect the primitive values of entity changesets by using the API on the PreUpdateEventArgs instance passed to the preUpdate listener method. Any changes to the state of the entitys properties won't affect the database UPDATE statement anymore. This gives drastic performance benefits for the preUpdate event.

Collection API

The Collection interface in the Common package has been updated with some missing methods that were present only on the default implementation, ArrayCollection. Custom collection implementations need to be updated to adhere to the updated interface.

Upgrade from 2.0-ALPHA3 to 2.0-ALPHA4

CLI Controller changes

CLI main object changed its name and namespace. Renamed from Doctrine\ORM\Tools\Cli to Doctrine\Common\Cli\CliController. Doctrine\Common\Cli\CliController now only deals with namespaces. Ready to go, Core, Dbal and Orm are available and you can subscribe new tasks by retrieving the namespace and including new task. Example:

[php]
$cli->getNamespace('Core')->addTask('my-example', '\MyProject\Tools\Cli\Tasks\MyExampleTask');

CLI Tasks documentation

Tasks have implemented a new way to build documentation. Although it is still possible to define the help manually by extending the basicHelp and extendedHelp, they are now optional. With new required method AbstractTask::buildDocumentation, its implementation defines the TaskDocumentation instance (accessible through AbstractTask::getDocumentation()), basicHelp and extendedHelp are now not necessary to be implemented.

Changes in Method Signatures

* A bunch of Methods on both Doctrine\DBAL\Platforms\AbstractPlatform and Doctrine\DBAL\Schema\AbstractSchemaManager
  have changed quite significantly by adopting the new Schema instance objects.

Renamed Methods

* Doctrine\ORM\AbstractQuery::setExpireResultCache() -> expireResultCache()
* Doctrine\ORM\Query::setExpireQueryCache() -> expireQueryCache()

SchemaTool Changes

* "doctrine schema-tool --drop" now always drops the complete database instead of
only those tables defined by the current database model. The previous method had
problems when foreign keys of orphaned tables pointed to tables that were schedulded
for deletion.
* Use "doctrine schema-tool --update" to get a save incremental update for your
database schema without deleting any unused tables, sequences or foreign keys.
* Use "doctrine schema-tool --complete-update" to do a full incremental update of
your schema.

Upgrade from 2.0-ALPHA2 to 2.0-ALPHA3

This section details the changes made to Doctrine 2.0-ALPHA3 to make it easier for you to upgrade your projects to use this version.

CLI Changes

The $args variable used in the cli-config.php for configuring the Doctrine CLI has been renamed to $globalArguments.

Proxy class changes

You are now required to make supply some minimalist configuration with regards to proxy objects. That involves 2 new configuration options. First, the directory where generated proxy classes should be placed needs to be specified. Secondly, you need to configure the namespace used for proxy classes. The following snippet shows an example:

[php]
// step 1: configure directory for proxy classes
// $config instanceof Doctrine\ORM\Configuration
$config->setProxyDir('/path/to/myproject/lib/MyProject/Generated/Proxies');
$config->setProxyNamespace('MyProject\Generated\Proxies');

Note that proxy classes behave exactly like any other classes when it comes to class loading. Therefore you need to make sure the proxy classes can be loaded by some class loader. If you place the generated proxy classes in a namespace and directory under your projects class files, like in the example above, it would be sufficient to register the MyProject namespace on a class loader. Since the proxy classes are contained in that namespace and adhere to the standards for class loading, no additional work is required. Generating the proxy classes into a namespace within your class library is the recommended setup.

Entities with initialized proxy objects can now be serialized and unserialized properly from within the same application.

For more details refer to the Configuration section of the manual.

Removed allowPartialObjects configuration option

The allowPartialObjects configuration option together with the Configuration#getAllowPartialObjects and Configuration#setAllowPartialObjects methods have been removed. The new behavior is as if the option were set to FALSE all the time, basically disallowing partial objects globally. However, you can still use the Query::HINT_FORCE_PARTIAL_LOAD query hint to force a query to return partial objects for optimization purposes.

Renamed Methods

• Doctrine\ORM\Configuration#getCacheDir() to getProxyDir()
• Doctrine\ORM\Configuration#setCacheDir($dir) to setProxyDir($dir)