Support for Ransack scopes

[markedmondson]

Since we now have scope support in Ransack it'd be nice to obviously be able to use this through ransack_ui, the issues as I see it are:

a) scopes without arguments require a true / false (on / negation) predicate adding to the UI
a) scopes accepting an argument don't have a type attributes for the predicates to be built from

Any additional thoughts?

[ndbroadbent]

Hi Mark, I haven't had a chance to look at this project for a long time. I was wondering if you would like to be added as a collaborator and help with the development? Let me know what you think. No worries if you don't have time to work on it right now.

[markedmondson]

Sure, it looks like pretty maintainable in terms of issues and we're using it heavily so we'll definitely need to implement this. If you have any good insight/thoughts on how to I'm happy to hear them.