Add support for deepObject-style parameters

Author: Sebastian Gaul

src/templates/core/functions/getQueryString.hbs

@@ -7,6 +7,11 @@ function getQueryString(params: Record<string, any>): string {
                 value.forEach(value => {
                     qs.push(`${encodeURIComponent(key)}=${encodeURIComponent(String(value))}`);
                 });
+            } else if (typeof value === 'object') {
+              Object.entries(value).forEach(([innerKey, value]) => {
+                const target = `${key}[${innerKey}]`
+                qs.push(`${encodeURIComponent(target)}=${encodeURIComponent(String(value))}`);
+              });
             } else {
                 qs.push(`${encodeURIComponent(key)}=${encodeURIComponent(String(value))}`);
             }

test/__snapshots__/index.spec.js.snap

@@ -2704,6 +2704,7 @@ export { ParametersService } from './services/ParametersService';
 export { RequestBodyService } from './services/RequestBodyService';
 export { ResponseService } from './services/ResponseService';
 export { SimpleService } from './services/SimpleService';
+export { StyleService } from './services/StyleService';
 export { TypesService } from './services/TypesService';
 export { UploadService } from './services/UploadService';
 "
@@ -4957,6 +4958,38 @@ export class SimpleService {
 }"
 `;
 
+exports[`v3 should generate: ./test/generated/v3/services/StyleService.ts 1`] = `
+"/* istanbul ignore file */
+/* tslint:disable */
+/* eslint-disable */
+import { request as __request } from '../core/request';
+import { OpenAPI } from '../core/OpenAPI';
+
+export class StyleService {
+
+    /**
+     * @param parameterDeepObject This is an object parameter that is send in deepObject style
+     * @throws ApiError
+     */
+    public static async style(
+        parameterDeepObject?: {
+            propOne?: string,
+            propTwo?: boolean,
+        },
+    ): Promise<void> {
+        const result = await __request({
+            method: 'GET',
+            path: \`/api/v\${OpenAPI.VERSION}/style\`,
+            query: {
+                'parameterDeepObject': parameterDeepObject,
+            },
+        });
+        return result.body;
+    }
+
+}"
+`;
+
 exports[`v3 should generate: ./test/generated/v3/services/TypesService.ts 1`] = `
 "/* istanbul ignore file */
 /* tslint:disable */

test/spec/v3.json

@@ -792,6 +792,34 @@
                 ]
             }
         },
+        "/api/v{api-version}/style": {
+          "get": {
+              "tags": [
+                  "style"
+              ],
+              "operationId": "Style",
+              "parameters": [
+                  {
+                      "description": "This is an object parameter that is send in deepObject style",
+                      "name": "parameterDeepObject",
+                      "in": "query",
+                      "style": "deepObject",
+                      "schema": {
+                          "type": "object",
+                          "properties": {
+                              "propOne": {
+                                "type": "string"
+                              },
+                              "propTwo": {
+                                "type": "boolean"
+                              }
+                          }
+                      },
+                      "collectionFormat": "csv"
+                  }
+              ]
+          }
+      },
         "/api/v{api-version}/types": {
             "get": {
                 "tags": [