API versioning

Think about versioning your API

If you introduce changes to your current API, your users might not upgrade their applications right away, so versioning is important to prevent existing applications to break when such changes are made.

How to version your API ?

There are several ways, none is standard:

Use an uri parameter /v1/users
Use a query parameter /users?version=v1
Use a custom mime-type with an Accept header Accept: application/json; version=1.0
Use a custom header X-Accept-Version: v1

The FOSRestBundle allows you to use several of them at the same time or to choose one of them.

URI API versioning

If you want to version your api with the uri, you can simply use the symfony router:

# config/routes.yaml
my_route:
    # ...
    path: /{version}/foo/route

Note: this will override the version attribute of the request if you use the FOSRestBundle versioning.

Configure `FOSRestBundle` to use the api versioning

You should activate the versioning:

fos_rest:
    versioning: true

If you do not want to allow all the methods described above, you should choose which version resolver to enable:

fos_rest:
    versioning:
        enabled: true
        resolvers:
            query: true # Query parameter: /users?version=v1
            custom_header: true # X-Accept-Version header
            media_type: # Accept header
                enabled: true
                regex: '/(v|version)=(?P<version>[0-9\.]+)/'

You can also choose the guessing order:

fos_rest:
    versioning:
        enabled: true
        guessing_order:
            - query
            - custom_header
            - media_type

The matched version is set as a Request attribute with the name version, and when using JMS serializer it is also set as an exclusion strategy automatically in the ViewHandler.

If you want to version by Accept header, you will need to do the following:

The format listener must be enabled

See :doc:`Format Listener <format_listener>`
The client must pass the requested version in his header like this :
```
Accept:application/json;version=1.0
```

You must configure the possible mime types for all supported versions:

fos_rest:
    view:
        mime_types:
            json: ['application/json', 'application/json;version=1.0', 'application/json;version=1.1']

Note: If you have to handle huge versions and mime types, you can simplify the configuration with a php script:

// app/config/fos_rest_mime_types.php
$versions = array(
    '1.0',
    '1.1',
    '2.0',
);

$mimeTypes = array(
    'json' => array(
        'application/json',
    ),
    'yml'  => array(
        'application/yaml',
        'text/yaml',
    ),
);

array_walk($mimeTypes, function (&$mimeTypes, $format, $versions) {
    $versionMimeTypes = array();
    foreach ($mimeTypes as $mimeType) {
        foreach ($versions as $version) {
            array_push($versionMimeTypes, sprintf('%s;version=%s', $mimeType, $version));
            array_push($versionMimeTypes, sprintf('%s;v=%s', $mimeType, $version));
        }
    }
    $mimeTypes = array_merge($mimeTypes, $versionMimeTypes);
}, $versions);

$container->loadFromExtension('fos_rest', array(
    'view' => array(
        'mime_types' => $mimeTypes,
    ),
));

And then, import it from your Symfony config:

imports:
    - { resource: fos_rest_mime_types.php }

Use the `JMSSerializer` with the API versioning

You should have tagged your entities with version information (@Since, @Until ...)

See this JMS Serializer article for details about versioning objects.

That's it, it should work now.

How to match a specific version in my routing ?

You can use conditions on your request to check for the version that was determined:

my_route:
    # ...
    condition: "request.attributes.get('version') == 'v2'"

FOSRestBundle/Resources/doc/versioning.rst

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