Is there by chance a way to do negative permissions? I have a use case where I want to allow someone to only vote once in a poll and to not allow them to create a vote if they have created one already. My assumption is I need to do this in the custom function via the API but wanted to see if there was any way to do it inside the permissions system.

if you're talking about Graphcool Framework, there is not.

Thanks, just wanted to make sure. Not that implementing it in the function is more than a couple lines.