Added ability to search for tickets by event_id

[eewang]

No description provided.

[rloomba]

Hi, thanks for the pull request. A couple things:

• base_uri is a method defined within the gem HTTTParty, please refer to line 91 of here: https://github.com/jnunemaker/httparty/blob/master/lib/httparty.rb. changing to @base_uri is not necessary
• I believe a better implementation of finding tickets for a given event would be to search for the event by id, this will return an Event object. Then call a "tickets" instance method on this Event object, which should return an array of Ticket objects that belong to that specific Event.

please feel free to rework your pull request accordingly

[rurabe]

I think eewang is on the right track though, you will want a way to get tickets for an event_id that is known without having to do two separate requests.

The way I approached it in my pull request was by giving every class a ::find method that lets you build a query from scratch. And when you look at the syntax, I think it's pretty clear what's going on when you call:

Ticket.find(:event_id => 12345)