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YAML Mapping

The YAML mapping driver enables you to provide the ODM 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 document/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.
<?php

$driver->setFileExtension('.yml');

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

// $config instanceof Doctrine\ODM\MongoDB\Configuration
$driver = new YamlDriver(array('/path/to/files'));
$config->setMetadataDriverImpl($driver);

Simplified YAML Driver

The Symfony project sponsored a driver that simplifies usage of the YAML Driver. The changes between the original driver are:

  1. File Extension is .mongodb-odm.yml
  2. Filenames are shortened, "MyProject\Documents\User" will become User.mongodb-odm.yml
  3. You can add a global file and add multiple documents in this file.

Configuration of this client works a little bit different:

<?php
$namespaces = array(
    '/path/to/files1' => 'MyProject\Documents',
    '/path/to/files2' => 'OtherProject\Documents'
);
$driver = new \Doctrine\ODM\MongoDB\Mapping\Driver\SimplifiedYamlDriver($namespaces);
$driver->setGlobalBasename('global'); // global.mongodb-odm.yml

Example

As a quick start, here is a small example document that makes use of several common elements:

# Documents.User.dcm.yml

Documents\User:
  db: documents
  collection: user
  fields:
    id:
      id: true
    username:
      name: login
      type: string
    email:
      unique:
        order: desc
    createdAt:
      type: date
  indexes:
    index1:
      keys:
        username: desc
      options:
        unique: true
        dropDups: true
        safe: true
  embedOne:
    address:
      targetDocument: Documents\Address
  embedMany:
    phonenumbers:
      targetDocument: Documents\Phonenumber
  referenceOne:
    profile:
      targetDocument: Documents\Profile
      cascade: all
    account:
      targetDocument: Documents\Account
      cascade: all
  referenceMany:
    groups:
      targetDocument: Documents\Group
      cascade: all

# Alternative syntax for the exact same example
# (allows custom key name for embedded document and reference).
Documents\User:
  db: documents
  collection: user
  fields:
    id:
      id: true
    username:
      name: login
      type: string
    email:
      unique:
        order: desc
    createdAt:
      type: date
    address:
      embedded: true
      type: one
      targetDocument: Documents\Address
    phonenumbers:
      embedded: true
      type: many
      targetDocument: Documents\Phonenumber
    profile:
      reference: true
      type: one
      targetDocument: Documents\Profile
      cascade: all
    account:
      reference: true
      type: one
      targetDocument: Documents\Account
      cascade: all
    groups:
      reference: true
      type: many
      targetDocument: Documents\Group
      cascade: all
  indexes:
    index1:
      keys:
        username: desc
      options:
        unique: true
        dropDups: true
        safe: true

Be aware that class-names specified in the YAML files should be fully qualified.

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