model_resource.py

class CompanyResource(ModelResource):
    class Meta:
        resource_name = 'companies'
        api_name = 'v1'
        detail_uri_name = 'domain'
        queryset = Company.objects.all()
    def prepend_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/(?P<domain>[\w\d_.-]+)/$" % 
                    self._meta.resource_name,
                self.wrap_view('dispatch_detail'),
                name="api_dispatch_detail"),
        ]

model_resource_v0.9.11.py

class CompanyResource(ModelResource):
    class Meta:
        resource_name = 'companies'
        queryset = Company.objects.all()
    def override_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/(?P<domain>[\w\d_.-]+)/$" % 
                        self._meta.resource_name,
                    self.wrap_view('dispatch_detail'),
                    name="api_dispatch_detail"),
        ]
    def get_resource_uri(self, bundle_or_obj):
        kwargs = {
            'resource_name': self._meta.resource_name,
            'api_name': self._meta.api_name
        }
        if isinstance(bundle_or_obj, Bundle):
            kwargs['domain'] = bundle_or_obj.obj.domain
        else:
            kwargs['domain'] = bundle_or_obj.domain
        return self._build_reverse_url("api_dispatch_detail", kwargs=kwargs)

resource.py

class CompanyResource(Resource):
    class Meta:
        resource_name = 'companies'
        api_name = 'v1'
    def obj_get(self, request=None, **kwargs):
        return Company.objects.get(domain=kwargs['domain'])
    def prepend_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/(?P<domain>[\w\d_.-]+)/$" % 
                    self._meta.resource_name,
                self.wrap_view('dispatch_detail'),
                name="api_dispatch_detail"),
        ]
    # This (along with _meta.api_name and _meta.resource_name) will 
    # need to be plugged into the above URL
    def detail_uri_kwargs(self, bundle_or_obj):
        if isinstance(bundle_or_obj, Bundle):
            return { 'domain': bundle_or_obj.obj.domain }
        else:
            return { 'domain': bundle_or_obj.domain }