Add General Query Param To Drf-Yasg.py

from drf_yasg.generators import OpenAPISchemaGenerator
from drf_yasg.views import get_schema_view
from drf_yasg import openapi

from rest_framework.permissions import IsAdminUser


class CustomSchemeGenerator(OpenAPISchemaGenerator):
    def get_path_parameters(self, path, view_cls):
        parameters = super().get_path_parameters(path, view_cls)
        field = openapi.Parameter(
            name='foo',
            description="Set foo param",
            required=True,
            in_=openapi.IN_QUERY,
            type=openapi.TYPE_INTEGER,
            default=1,
        )
        parameters.append(field)
        return parameters


schema_view = get_schema_view(
    openapi.Info(title="MY API", default_version="v1"),
    generator_class=CustomSchemeGenerator,
    public=True,
)


# It will add to http://<domain>/path/to/?foo=<valeu> to end of all urls. 
# You may would like to change IN_QUERY with IN_BODY, IN_PATH, IN_FORM or IN_HEADER.