[typescript-axios] doesn't serialize deepObject query params

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What’s the actual output vs expected output? input: {day: 20, year: {min: 1990, max: 2000}} actual output: ?day=20&year expected output: ?day=20&year[min]=1990&year[max]=2000

Description

I’m using [typescript-axios] api client generator. Some of the properties I pass to it specified as deepObject. It looks that it doesn’t support this type of args at all. Is there any possible ways to fix it?

openapi-generator version

v4.3.1 v5.0.0-beta

OpenAPI declaration file content or url

YearRange:
      in: query
      name: year
      required: false
      style: deepObject
      schema:
        type: object
        properties:
          min:
            type: string
            example: 2010
          max:
            type: string
            example: 2019

Generation Details

[typescript-axios] generator

Steps to reproduce

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/6075

Suggest a fix

Replace old deprecated url API with URLSearchParams.

[wamujlb]

I have made a workaround but I think that it will be good to add it to the generator.

export const setSearchParams = function (url: URL, ...objects: any[]) {
    const searchParams = new URLSearchParams(url.search);
    for (const object of objects) {
        for (const key in object) {
            /**
             * @workaround
             * Convert object value to the string
             * {sort: {date: 'desc', order: 'asc'}} => 'sort[date]=desc&sort[order]=asc'
             */
            const value = object[key];

            if(typeof value === 'object'){
                Object.entries(value).forEach(([entryKey, entryValue]) => {
                    searchParams.set(`${key}[${entryKey}]`, String(entryValue));
                })
            } else {
                searchParams.set(key, value);
            }
        }
    }
    url.search = searchParams.toString();
}

[talss89]

I’ve just had a similar problem. Loopback 4 expects filter parameters as serialised JSON.

It can be solved in a ‘nice’ way using template overrides.

• Create a template override directory eg. openapi-templates
• Copy apiInner.mustacheinto openapi-templates from https://github.com/OpenAPITools/openapi-generator/blob/7ffd0711c3c3e7e08110a3e8d63e324daa1773d8/modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache
• Change the serialisation logic to your taste around lines 94 - 136. Search for localVarQueryParameter. My example is below.
• Pass -t /path/to/openapi-templates to openapi-generator-cli
• Rebuild

I modified the template to serialise any object passed as a parameter to JSON:

if(typeof {{paramName}} === 'object' && {{paramName}} !== null)
    localVarQueryParameter['{{baseName}}'] = JSON.stringify({{paramName}});
else
    localVarQueryParameter['{{baseName}}'] = {{paramName}};

@wamujlb - In your case, you could probably add your code to the template.