Frequently Asked Questions (FAQ)

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Sharing parameter configuration

Q: I use the same value in multiple endpoints. How can I avoid duplicating the descriptions?

A: You can configure definitions in the nelmio_api_doc configuration and then reference them:

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# config/nelmio_api_doc.yml
nelmio_api_doc:
    documentation:
        definitions:
            NelmioImageList:
                description: "Response for some queries"
                type: object
                properties:
                    total:
                        type: integer
                        example: 42
                    items:
                        type: array
                        items:
                            $ref: "#/definitions/ImageMetadata"
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// src/App/Controller/NelmioController.php

/**
 * @SWG\Response(
 *     response=200,
 *     description="List of image definitions",
 *     @SWG\Schema(
 *       type="object",
 *       title="ListOperationsResponse",
 *       additionalProperties={"$ref": "#/definitions/NelmioImageList"}
 *     )
 */

Optional Path Parameters

Q: I have a controller with an optional path parameter. In swagger-ui, the parameter is required - can I make it optional? The controller might look like this:

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/**
 * Get all user meta or metadata for a specific field.
 *
 * @Route("/{user}/meta/{metaName}",
 *     methods={"GET"},
 *     name="get_user_metadata"
 * )
 *
 * @SWG\Response(
 *     response=200,
 *     description="Json object with all user meta data or a json string with the value of the requested field"
 * )
 */
public function getAction(string $user, string $metaName = null)
{
    ...
}

A: Optional path parameters are not supported by the OpenAPI specification. The solution to this is to define two separate actions in your controller. For example:

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/**
 * Get all user meta data.
 *
 * @Route("/{user}/meta",
 *     methods={"GET"},
 *     name="get_user_metadata"
 * )
 *
 * @SWG\Response(
 *     response=200,
 *     description="Json hashmap with all user meta data",
 *     @SWG\Schema(
 *        type="object",
 *        example={"foo": "bar", "hello": "world"}
 *     )
 *
 * )
 */
public function cgetAction(string $user)
{
    return $this->getAction($user, null);
}

/**
 * Get user meta for a specific field.
 *
 * @Route("/{user}/meta/{metaName}",
 *     methods={"GET"},
 *     name="get_user_metadata_single"
 * )
 *
 * @SWG\Response(
 *     response=200,
 *     description="A json string with the value of the requested field",
 *     @SWG\Schema(
 *          type="string"
 *     )
 * )
 */
public function getAction(string $user, string $metaName = null)
{
    ...
}

The first action is redundant for Symfony, but adds all the relevant documentation for the OpenAPI specification.

Asset files not loaded

Q: How do I fix 404 or 406 HTTP status on NelmioApiDocBundle assets files (css, js, images)?

A: The assets normally are installed by composer if any command event (usually post-install-cmd or post-update-cmd) triggers the ScriptHandler::installAssets script. If you have not set up this script, you can manually execute this command:

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$ bin/console assets:install --symlink

Re-add Google Fonts

Q: How can I change the font for the UI?

A: We removed the google fonts in 3.3 to avoid the external request for GDPR reasons. To change the font, you can customize the template to add this style information:

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{# templates/bundles/NelmioApiDocBundle/SwaggerUi/index.html.twig #}

{#
   To avoid a "reached nested level" error an exclamation mark `!` has to be added
   See https://symfony.com/blog/new-in-symfony-3-4-improved-the-overriding-of-templates
#}
{% extends '@!NelmioApiDoc/SwaggerUi/index.html.twig' %}

{% block stylesheets %}
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,700|Source+Code+Pro:300,600|Titillium+Web:400,600,700">
    {{ parent() }}
    <style type="text/css" rel="stylesheet">
        #formats {
            font-family: Open Sans,sans-serif;
        }

        .swagger-ui .opblock-tag,
        .swagger-ui .opblock .opblock-section-header label,
        .swagger-ui .opblock .opblock-section-header h4,
        .swagger-ui .opblock .opblock-summary-method,
        .swagger-ui .tab li,
        .swagger-ui .scheme-container .schemes>label,
        .swagger-ui .loading-container .loading:after,
        .swagger-ui .btn,
        .swagger-ui .btn.cancel,
        .swagger-ui select,
        .swagger-ui label,
        .swagger-ui .dialog-ux .modal-ux-content h4,
        .swagger-ui .dialog-ux .modal-ux-header h3,
        .swagger-ui section.models h4,
        .swagger-ui section.models h5,
        .swagger-ui .model-title,
        .swagger-ui .parameter__name,
        .swagger-ui .topbar a,
        .swagger-ui .topbar .download-url-wrapper .download-url-button,
        .swagger-ui .info .title small pre,
        .swagger-ui .scopes h2,
        .swagger-ui .errors-wrapper hgroup h4 {
            font-family: Open Sans,sans-serif!important;
        }
    </style>
{% endblock stylesheets %}

Endpoints grouping

Q: Areas feature doesn't fit my needs. So how can I group similar endpoints of one or more controllers in a separate section in the documentation?

A: Use @SWG\Tag annotation.

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/**
 * Class BookmarkController
 *
 * @SWG\Tag(name="Bookmarks")
 */
class BookmarkController extends AbstractFOSRestController implements ContextPresetInterface
{
    //...
}

Disable Default Section

Q: I don't want to render the "default" section, how do I do that?

A: Use disable_default_routes config in your area.

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nelmio_api_doc:
    areas:
        default:
            disable_default_routes: true
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
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