feat: add x-additionalPropertiesName (#622) (#944)

* Add x-additionalPropertiesName (#622)

Supply custom name to be displayed for property name of
`additionalProperties`.

* Include prettier output for Schema.ts

README.md

@@ -218,6 +218,7 @@ ReDoc makes use of the following [vendor extensions](https://swagger.io/specific
 * [`x-tagGroups`](docs/redoc-vendor-extensions.md#x-tagGroups) - group tags by categories in the side menu
 * [`x-servers`](docs/redoc-vendor-extensions.md#x-servers) - ability to specify different servers for API (backported from OpenAPI 3.0)
 * [`x-ignoredHeaderParameters`](docs/redoc-vendor-extensions.md#x-ignoredHeaderParameters) - ability to specify header parameter names to ignore
+* [`x-additionalPropertiesName`](docs/redoc-vendor-extensions.md#x-additionalPropertiesName) - ability to supply a descriptive name for the additional property keys
 
 ### `<redoc>` options object
 You can use all of the following options with standalone version on <redoc> tag by kebab-casing them, e.g. `scrollYOffset` becomes `scroll-y-offset` and `expandResponses` becomes `expand-responses`.

docs/redoc-vendor-extensions.md

@@ -278,3 +278,31 @@ PayPalPayment:
 
 In the example above the names of definitions (`PayPalPayment`) are named differently than
 names in the payload (`paypal`) which is not supported by default `discriminator`.
+
+#### x-additionalPropertiesName
+**ATTENTION**: This is ReDoc-specific vendor extension. It won't be supported by other tools.
+
+Extends the `additionalProperties` property of the schema object.
+
+| Field Name     |	Type	  | Description |
+| :------------- | :------: | :---------- |
+| x-additionalPropertiesName | string | descriptive name of additional properties keys  |
+
+###### Usage in ReDoc
+ReDoc uses this extension to display a more descriptive property name in objects with `additionalProperties` when viewing the property list with an `object`.
+
+###### x-additionalPropertiesName example
+
+```yaml
+Player:
+  required:
+  - name
+
+  properties:
+    name:
+      type: string
+
+  additionalProperties:
+    x-additionalPropertiesName: attribute-name
+    type: string
+```

src/services/models/Schema.ts

@@ -292,7 +292,10 @@ function buildFields(
       new FieldModel(
         parser,
         {
-          name: 'property name *',
+          name: (typeof additionalProps === 'object'
+            ? additionalProps['x-additionalPropertiesName'] || 'property name'
+            : 'property name'
+          ).concat('*'),
           required: false,
           schema: additionalProps === true ? {} : additionalProps,
           kind: 'additionalProperties',

src/utils/openapi.ts

@@ -423,6 +423,7 @@ export function isRedocExtension(key: string): boolean {
     'x-servers': true,
     'x-tagGroups': true,
     'x-traitTag': true,
+    'x-additionalPropertiesName': true,
   };
 
   return key in redocExtensions;