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UPGRADE-4.0.md

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Upgrading From 3.x To 4.0

Version 4 is a major change introducing OpenAPI 3.0 support, the rebranded swagger specification, which brings a set of new interesting features. Unfortunately this required a rework to a large part of the bundle, and introduces BC breaks.

The Visual guide to "What's new in 3.0 spec" gives more information on OpenApi 3.0.

Version 4 does not support older versions of the specification. If you need to output swagger v2 documentation, you will need to use the latest 3.x release.

The Upgrade to Swagger 3.0

The biggest part of the upgrade will most likely be the upgrade of the library zircote/swagger-php to 3.0 which introduces new annotations in order to support OpenAPI 3.0 but also changes their namespace from Swagger to OpenApi.

They created a dedicated page to help you upgrade : https://github.com/zircote/swagger-php/blob/3.x/docs/Migrating-to-v3.md.

Here are some additional advices that are more likely to apply to NelmioApiDocBundle users:

  • Upgrade all your use Swagger\Annotations as SWG statements to use OpenApi\Annotations as OA; (to simplify the upgrade you may also stick to the SWG aliasing). In case you changed SWG to OA, upgrade all your annotations from @SWG\... to @OA\....

  • Update your config in case you used inlined swagger documentation (the field nelmio_api_doc.documentation). A tool is available to help you convert it.

  • In case you used @OA\Response(..., @OA\Schema(...)), you should explicit your media type by using the annotation @OA\JsonContent or @OA\XmlContent instead of @OA\Schema: @OA\Response(..., @OA\JsonContent(...)) or @OA\Response(..., @OA\XmlContent(...)).

    When you use @Model directly (@OA\Response(..., @Model(...)))), the media type is set by default to json.

BC Breaks

There are also BC breaks that were introduced in 4.0:

  • We migrated from EXSyst\Component\Swagger\Swagger to OpenApi\Annotations\OpenApi to describe the api in all our describers signature (DescriberInterface, RouteDescriberInterface, ModelDescriberInterface, PropertyDescriberInterface).

  • PropertyDescriberInterface now takes several types as input to leverage compound types support in OpenApi 3.0 (int|string for instance).