rails 3: using ID from many-to-many table to do another query -

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i have table contacts, table events, , joining table contact_id , event_id map many-to-many relationship.

i'm new ror , i'm used querying first table, building set of ids , running query on second table id in setofids. how done in ror well?

here's have far:

def view  @contact = contact.find(params[:contact_id])  @contactevents = contacts_event.where(:contact_id => params[:contact_id])   s1 = set.new  @contactevents.each |contactevent|    s1.add(contactevent.event_id) end   @contactevents_test = event.where(:id => @s1)  end

well 1 way looking @ has_and_belongs_to_many association (guide here). idea when @contact = contact.find(params[:contact_id]) automatically pull of associated contacts_events 1 query.


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