Resource inheritance removes class level variables

[dharvey-consbio]

When trying to extend FeatureLayerResource:

from restle.actions import Action
from restle.fields import TextField
from restle.resources import Resource


class ParentResource(Resource):
    text_field = TextField()
    query_field = Action(...)


class ChildResourceOne(ParentResource):
    pass  # text_field present, query_field unavailable


class ChildResourceTwo(ParentResource):
    # Class definition fails because query_field is removed
    query_field = ParentResource.query_field

There is no way to inherit query_field in the usual manner of Python class inheritance.

Current workaround: put Action(...) into a constant that can be referenced in both the parent and the child classes:

from restle.actions import Action
from restle.fields import TextField
from restle.resources import Resource

QUERY_ACTION = Action(...)


class ParentResource(Resource):
    text_field = TextField()
    query_field = QUERY_ACTION


class ChildResourceOne(ParentResource):
    query_field = QUERY_ACTION