wrapping code that runs in Rails environment into a module - ruby-on-rails

Question

I have this code and it works perfectly
require "date"
#past = []
#future = []
#artist = Artist.find(2)
def sort_by_date(artist)
artist.events.each do |event|
if event.date < DateTime.now
#past << event.id
else
#future << event.id
end
end
end
def event_title(arr)
arr.each do |event_id|
e = Event.find(event_id)
artist_names = []
e.artists.each do |artist|
unless artist.name == #artist.name
artist_names << artist.name
end
end
puts "#{e.name} with #{artist_names.join(", ")} at #{(Venue.find(e.venue_id)).name}"
end
end
sort_by_date(#artist)
puts "Upcoming Events: "
event_title(#future)
puts "Past Events: "
event_title(#past)
I want to run wrap this operation into a module, but I'm having trouble understanding how to pass artist_id to it properly. With this command rails runner app/modules/artist_event_sort.rb, I'm getting this error: ``': undefined method sort_by_date' for SortedArtistEvents:Module (NoMethodError). The two methods sort_by_date and event_title worked as they should before I tried wrapping this whole operation up into a module, so that's where I know I've missed something.
module SortedArtistEvents
require "date"
attr_accessor :artist_id
def initialize(artist_id)
#past = []
#future = []
#artist = Artist.find(artist_id)
end
def sort_by_date(artist)
artist.events.each do |event|
if event.date < DateTime.now
#past << event.id
else
#future << event.id
end
end
end
def event_title(arr)
arr.each do |event_id|
e = Event.find(event_id)
artist_names = []
e.artists.each do |artist|
unless artist.name == #artist.name
artist_names << artist.name
end
end
puts "#{e.name} with #{artist_names.join(", ")} at #{(Venue.find(e.venue_id)).name}"
end
end
sort_by_date(#artist)
puts "Upcoming Events: "
self.event_title(#future)
puts "Past Events: "
event_title(#past)
end
class LetsSort
include SortedArtistEvents
end
test_artist_sort = LetsSort.new(2)

Answer 1

It looks like there are a couple things wrong here. You are trying to initialize a module, you can only initialize a class, e.g. class SortedArtistEvents.
If you have this:
module Foo
def bar; end
end
bar is only accessible by including or extending a module or class with Foo. With your error undefined method sort_by_date' for SortedArtistEvents:Module you would have to do
module SortedArtistsEvents
def self.sort_by_date; end
end
to get behavior like SortedArtistsEvents.sort_by_date