Registration for Events

app/models/registration.rb

@@ -7,7 +7,7 @@ class Registration < ActiveRecord::Base
   has_and_belongs_to_many :vchoices
 
   has_many :events_registrations
-  has_many :workshops, through: :events_registrations, source: :event
+  has_many :events, through: :events_registrations
 
   accepts_nested_attributes_for :user
   accepts_nested_attributes_for :qanswers
@@ -24,16 +24,40 @@ class Registration < ActiveRecord::Base
 
   validates_uniqueness_of :user_id, scope: :conference_id, message: 'already Registered!'
   validate :registration_limit_not_exceed, on: :create
+  validate :registration_to_events_only_if_present
 
   after_create :set_week, :subscribe_to_conference, :send_registration_mail
   after_destroy :destroy_purchased_tickets
 
+  ##
+  # Makes a list of events that includes (in that order):
+  # Events that require registration, and registration to them is still possible
+  # Events to which the user is already registered to
+  # ==== RETURNS
+  # * +Array+ -> [event_to_register_to, event_already_registered_to]
+  def events_ordered
+    (conference.program.events.with_registration_open - events) + events
+  end
+
   def week
     created_at.strftime('%W').to_i
   end
 
   private
 
+  ##
+  # If the user registers to attend events that are already scheduled,
+  # only allow registration to events if the user will be present
+  # (based on arrival and departure attributes)
+  # No validation if arrival/departure attributes are empty
+  def registration_to_events_only_if_present
+    if (arrival || departure) && events.pluck(:start_time).any?
+      errors.add(:arrival, 'is too late! You cannot register for events that take place before your arrival') if events.pluck(:start_time).compact.map { |x| x < arrival }.any?
+
+      errors.add(:departure, 'is too early! You cannot register for events that take place after your departure') if events.pluck(:start_time).compact.map { |x| x > departure }.any?
+    end
+  end
+
   def destroy_purchased_tickets
     ticket_purchased = TicketPurchase.where(conference_id: conference_id, user_id: user.id)
     ticket_purchased.destroy_all