SlugRelatedField with DataclassSerializer

Describe the bug With version 0.25.0, our schema generation started to fail, because we use SlugRelatedField with DataclassSerializer not ModelSerializer, and therefore do not have field.parent.Meta.model field, but have provided queryset attr to SlugRelatedField constructor, which should be used to detect the type instead

Source of bug: https://github.com/tfranzel/drf-spectacular/commit/0307ff92029b5bf32ca42523e2e664a5405a18dc#diff-4d081c8c817b2246109e52886d6b1f078858a2d5c99ea6e694796e39a7d96d77R662 #893

To Reproduce

from dataclasses import dataclass

from django.db import models
from rest_framework import serializers
from rest_framework_dataclasses.serializers import DataclassSerializer

class MyModel(models.Model):
    name = models.CharField(max_length=200, unique=True)
    value = models.IntegerField()


@dataclass()
class MyBase:
    obj: MyModel


class MyBaseSerializer(DataclassSerializer):
    slug_name = serializers.SlugRelatedField(slug_field="name", source="obj", queryset=MyModel.objects)

    class Meta:
        dataclass = MyBase
        fields = ["slug_name"]

AttributeError: type object ‘Meta’ has no attribute ‘model’

Expected behavior model to be determined from provided queryset model = field.queryset.model if hasattr(field, "queryset") else getattr(field.parent.Meta, "model", None)

or perhaps try to deduct from dataclass field type ?

[tfranzel]

@HansAarneLiblik please review and test #899. hopefully this will do the trick.

[tfranzel]

of course there are multiple ways of using this field. 😞 I had a gut feeling this may produce issues. will look into it.