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module Scheduling |
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# ActiveModel access is slow enough that we create a stripped-down, in-memory version of the various |
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# models we need to create a schedule, then run the annealer against this in-memory model. |
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# This class sucks all the sessions and timeslots from the DB, and provides them during annealing. |
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# |
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# A Context, its Person objects, and their SessionSets do _not_ change during annealing. |
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# The Schedule class contains all the state we're trying to optimize. |
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# |
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class Context |
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attr_reader :sessions, :timeslots, :room_count |
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def initialize(event) |
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@timeslots = event.timeslots.where(schedulable: true) |
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@room_count = event.rooms.where(schedulable: true).count |
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# A presenter can have a session that we're manually keeping out of the schedule by making it |
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# manually_scheduled and assigning either no timeslot (like Indie Arcade) or an unschedulable |
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# timeslot (like Session 0). The scoring system would count that as an unresolvable problem |
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# for the presenter, since it wants every one of their sessions to be in a schedulable timeslot. |
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# We therefore ignore those sessions altogether for scheduling purposes. |
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# |
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@sessions = event.sessions |
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.where("not manually_scheduled or timeslot_id in (?)", @timeslots.map(&:id)) |
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.pluck(:id) |
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@people_by_id = Hash.new { |h,id| h[id] = Person.new(self, id) } |
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load_sets :attending, Attendance |
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load_sets :presenting, Presentation |
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report_count :attending |
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report_count :presenting |
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raise 'No session-presenter relationships in DB. Did you populate the presentations table?' unless people.size > 0 |
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event.presenter_timeslot_restrictions.each do |restriction| |
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person(restriction.participant_id). |
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assign_timeslot_penalty(restriction.timeslot_id, restriction.weight) |
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end |
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end |
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def people |
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@people_by_id.values |
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end |
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private |
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def person(id) |
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@people_by_id[id] |
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end |
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# @param [Symbol] role |
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# @param [Class] either Attendance or Presentation |
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def load_sets(role, association_model) |
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# This brute force iteration is hardly slick, but I'm too rusty on fancy ActiveRecord querying to care just now. -PPC |
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size = association_model.where(session_id: @sessions).select(:participant_id, :session_id).each do |assoc| |
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person(assoc.participant_id). |
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send(role). |
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add(assoc.session_id) |
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end.size |
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end |
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def report_count(role) |
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assoc_count = people.map { |p| p.send(role).size }.sum |
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person_count = people.count { |p| p.send(role).size > 0 } |
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puts "#{assoc_count} #{role.to_s.humanize.downcase} relationships" + |
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" (#{person_count} people, avg #{"%1.1f" % (assoc_count / person_count.to_f)} each)" |
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end |
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end |
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end |
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minnestar /
sessionizer
