The YAML mapping driver enables you to provide the ORM metadata in form of YAML documents.
The YAML mapping document of a class is loaded on-demand the first time it is requested and subsequently stored in the metadata cache. In order to work, this requires certain conventions:
- Each entity/mapped superclass must get its own dedicated YAML mapping document.
- The name of the mapping document must consist of the fully qualified name of the class, where namespace separators are replaced by dots (.).
- All mapping documents should get the extension ".dcm.yml" to identify it as a Doctrine mapping file. This is more of a convention and you are not forced to do this. You can change the file extension easily enough.
It is recommended to put all YAML mapping documents in a single folder but you can spread the documents over several folders if you want to. In order to tell the YamlDriver where to look for your mapping documents, supply an array of paths as the first argument of the constructor, like this:
<?php use Doctrine\ORM\Mapping\Driver\YamlDriver; // $config instanceof Doctrine\ORM\Configuration $driver = new YamlDriver(array('/path/to/files')); $config->setMetadataDriverImpl($driver);
The Symfony project sponsored a driver that simplifies usage of the YAML Driver. The changes between the original driver are:
- File Extension is .orm.yml
- Filenames are shortened, "MyProject\\Entities\\User" will become User.orm.yml
- You can add a global file and add multiple entities in this file.
Configuration of this client works a little bit different:
<?php $namespaces = array( '/path/to/files1' => 'MyProject\Entities', '/path/to/files2' => 'OtherProject\Entities' ); $driver = new \Doctrine\ORM\Mapping\Driver\SimplifiedYamlDriver($namespaces); $driver->setGlobalBasename('global'); // global.orm.yml
As a quick start, here is a small example document that makes use of several common elements:
# Doctrine.Tests.ORM.Mapping.User.dcm.yml Doctrine\Tests\ORM\Mapping\User: type: entity repositoryClass: Doctrine\Tests\ORM\Mapping\UserRepository table: cms_users schema: schema_name # The schema the table lies in, for platforms that support schemas (Optional, >= 2.5) readOnly: true indexes: name_index: columns: [ name ] id: id: type: integer generator: strategy: AUTO fields: name: type: string length: 50 email: type: string length: 32 column: user_email unique: true options: fixed: true comment: User's email address loginCount: type: integer column: login_count nullable: false options: unsigned: true default: 0 oneToOne: address: targetEntity: Address joinColumn: name: address_id referencedColumnName: id onDelete: CASCADE oneToMany: phonenumbers: targetEntity: Phonenumber mappedBy: user cascade: ["persist", "merge"] manyToMany: groups: targetEntity: Group joinTable: name: cms_users_groups joinColumns: user_id: referencedColumnName: id inverseJoinColumns: group_id: referencedColumnName: id lifecycleCallbacks: prePersist: [ doStuffOnPrePersist, doOtherStuffOnPrePersistToo ] postPersist: [ doStuffOnPostPersist ]
Be aware that class-names specified in the YAML files should be fully qualified.
It is possible to define unique constraints by the following declaration:
# ECommerceProduct.orm.yml ECommerceProduct: type: entity fields: # definition of some fields uniqueConstraints: search_idx: columns: [ name, email ]