Ruby client does not construct the correct url for channel stop for admin sdk

[sqrrrl]

Copied from https://code.google.com/a/google.com/p/apps-api-issues/issues/detail?id=3901

I am using the ruby sdk to make api calls to the google client. When I make the following call:

admin = client.discovered_api('admin', 'directory_v1')
admin_result = client.execute(:api_method => admin.channel.stop, :body_object => {"id": , "resourceId": })

It returns a 404 response and I can see the url it is building is:
https://www.googleapis.com/admin/directory/v1//admin/directory_v1/channels/stop

I am able to do a curl request to the following url successfully:
https://www.googleapis.com/admin/directory_v1/channels/stop