Question

New to both Ruby and Rails but I’m book educated by now (which apparently means nothing, haha).

I’ve got two models, Event and User joined through a table EventUser

class User < ActiveRecord::Base   has_many :event_users   has_many :events, :through => :event_users end  class EventUser < ActiveRecord::Base   belongs_to :event   belongs_to :user    #For clarity's sake, EventUser also has a boolean column 'active', among others end  class Event < ActiveRecord::Base   has_many :event_users   has_many :users, :through => :event_users end 

This project is a calendar, in which I have to keep track of people signing up and scratching their name out for a given event. I figure the many to many is a good approach, but I can’t do something like this:

u = User.find :first active_events = u.events.find_by_active(true) 

Because events don’t actually HAVE that extra data, the EventUser model does. And while I could do:

u = User.find :first active_events = [] u.event_users.find_by_active(true).do |eu|   active_events << eu.event end 

This seems to be contrary to ‘the rails way’. Can anyone enlighten me, this has been bugging me for a long time tonight (this morning)?

Answer 1

How about adding something like this into your User model?

has_many  :active_events, :through => :event_users,            :class_name => 'Event',            :source => :event,            :conditions => ['event_users.active = ?',true] 

After that you should be able to get active events for a user just by calling:

User.first.active_events