Cannot create list parameters

[dougalg]

Describe the bug
Using Python 3.6, Django 3.2.7, drf_spectacular latest, I am unable to create a list style parameter with an explicit OpenApiParameter annotation.

To Reproduce

from rest_framework.serializers import (ListField, CharField)
from drf_spectacular.utils import extend_schema, OpenApiParameter

@extend_schema(
		parameters=[
			OpenApiParameter(
				name='groupIds',
				location='query',
				type=ListField(child=CharField()),
				description='Group ids for which to fetch digests',
				required=True,
			)
		]
	)

I receive the following error:

<h1>AttributeError
       at /digests/api/schema</h1>
  <pre class="exception_value">'ListField' object has no attribute 'items'</pre>
  

Request Method: | GET
-- | --
http://localhost:8000/digests/api/schema
3.2.7
AttributeError
'ListField' object has no attribute 'items'
/usr/local/lib/python3.6/site-packages/drf_spectacular/plumbing.py, line 318, in build_parameter_type
/usr/local/bin/python
3.6.15

The internal error

/usr/local/lib/python3.6/site-packages/drf_spectacular/plumbing.py, line 318, in build_parameter_type

    ):

        irrelevant_field_meta = ['readOnly', 'writeOnly']

        if location == OpenApiParameter.PATH:

            irrelevant_field_meta += ['nullable', 'default']

        schema = {

            'in': location,

            'name': name,

            'schema': {k: v for k, v in schema.items() if k not in irrelevant_field_meta}, # <-------- here

     …

        }

        if description:

            schema['description'] = description

        if required or location == 'path':

            schema['required'] = True

        if deprecated:

Expected behavior
I should be able to define a list of strings as an API parameter.

[tfranzel]

Hi @dougalg,

this is invalid usage as the type hint indicated. no fields allowed here, but you could have also constructed this with a serializer that is equally not supported. this has only been raised once before, but I can imagine people ran into this more often.

currently you can only do this:

OpenApiParameter(name='test', type={'type': 'array', 'items': {'type': 'string'}})

improved warnings to guide the user. for convenience, next release will also support:

OpenApiParameter(name='test', type=str, many=True)

[dougalg]

Thank you! I think that this would address my needs. I'll try it out, thanks a lot!