[BUG] Ruby query param serialization defaults

Description

The query param serialization default properties are inconsistent with the Open api spec. The explode parameter default should be true when the style is form.

openapi-generator version

6.2

OpenAPI declaration file content or url

A query parameter like this:

  in: query
  name: some_ids
  style: form
  schema:
    type: array
    items:
        type: string

Generation Details

openapi-generator-cli generate -c /some/path -i /path-to-spec -g ruby -o /outputdir

Steps to reproduce

• Create a spec with an array parameter of type query.
• Generate the client.
• Hit the endpoint.
• Expected behavior is that the parameters are exploded (i.e. some_ids=1&some_ids=2)
• Actual behavior: they're csv format (you can make them exploded by including explode: true explicitly) but this is supposed to be the default behavior.

The open api spec definition for explode.

When this is true, parameter values of type array or object generate separate parameters for each value of the array or key-value pair of the map. For other types of parameters this property has no effect. When style is form, the default value is true. For all other styles, the default value is false.

See: https://swagger.io/specification/

Related issues/PRs

N/A

Suggest a fix

Not sure

Start by generating a Ruby client from the YAML query-parameter declaration and trace how array parameters are serialized for the form style. Confirm the generated request uses repeated parameters such as some_ids=1&some_ids=2 without an explicit explode setting, and add regression coverage for that default behavior.