Dynamic FilterSet generator for Django Rest Framework

filters.py

from django.db.models import ManyToOneRel
from django_filters import rest_framework as filters

def get_dynamic_filterset_filters(model_cls, prefix=None):
    """Get dynamic dictionary containing all fields and filter expressions for the specified model class."""
    field_filters = {}

    for field in model_cls._meta.get_fields():
        if isinstance(field, ManyToOneRel):
            continue

        field_name = f"{prefix}__{field.name}" if prefix else field.name

        match field.get_internal_type():
            case "JSONField":
                continue
            case "CharField":
                field_filters[field_name] = ["exact", "icontains"]
            case "DateField" | "DateTimeField":
                field_filters[field_name] = ["exact", "gt", "lt", "range"]
            case "DecimalField" | "FloatField" | "IntegerField":
                field_filters[field_name] = ["exact", "gt", "gte", "lt", "lte"]
            case "ForeignKey":
                field_filters[f"{field_name}_id"] = ["exact"]
                if field.related_model:
                    field_filters.update(get_dynamic_filterset_filters(field.related_model, field_name))
            case _:
                field_filters[field_name] = ["exact"]

    return field_filters


def get_dynamic_filterset_class(model_cls):
    """Get dynamic FilterSet class for the specified model class."""

    class Meta:
        model = model_cls
        fields = get_dynamic_filterset_filters(model_cls)

    return type(f"{model_cls.__name__}FilterSet", (filters.FilterSet,), {"Meta": Meta})