Compile data from different models into one list - ruby-on-rails

Question

My app has a user model, as well as multiple other date related models/tables such as anniversaries, holidays, birthdays, and and "other dates" custom model.
I have a user dashboard view that lists them all separately as shown below. How can i display all of these lists as one (call it upcoming events or something) that is listed chronologically and shows them upcoming dates for a certain period of time.
View
*note - These are displayed in a table/list but i stripped html for clarity
<h1>Holidays</h1>
<% if #user.holidays.any? %>
<% #user.holidays.each do |hld| %>
<%= hld.name %>
<%= hld.date %>
<% end %>
<h1>Friends Birthdays</h1>
<% if #user.friends.any? %>
<% #user.friends.each do |frd| %>
<%= frd.name %>
<%= frd.dob %>
<% end %>
<h1> Anniversary </h1>
<% if #user.anniversaries.any? %>
<% #user.anniversaries.each do |ann| %>
<%= ann.spouse_name %>
<%= ann.anniversary_date %>
<% end %>
Thanks!
Models
class User < ActiveRecord::Base
has_many :friends
has_many :occasions
has_many :user_holidays
has_many :holidays, :through => :user_holidays
has_many :anniversaries
class Holiday < ActiveRecord::Base
has_many :user_holidays
has_many :users, :through => :user_holidays
end
class Friend < ActiveRecord::Base
belongs_to :user
end
class Anniversary < ActiveRecord::Base
belongs_to :user
end

Answer 1

Assuming you want to be efficient (you could just combine the arrays, sort them and be done with it), there is no direct way to do it through the relations. I am assuming you have an events model which has a foreign key to the user, in that case,
Events.where(:user_id => #user.id).where(<EVENT DATE FILTERS>).order("event_date DESC")
-- EDIT --
This is quite dirty, but I cant think of any other direct db way of accomplishing this.
events = #user.holidays.map{|h| [h.name, h.date, :holiday]} + \
#user.friends.map{|f| [f.name, f.dob, :birthday]} + \
#user.anniversaries.map{|a| [a.spouse_name, a.anniversary.date, :anniversary]}
events.map!{|event| {:name => event[0], :date => event[1], :event_type => event[2]}}
# You now have an array of hashes with the events name, date and type.
events.sort{|a, b| a[:date] <=> b[:date]} # sort / filter