Add survey with target after_event

app/models/conference.rb

@@ -785,6 +785,16 @@ class Conference < ApplicationRecord
     short_title
   end
 
+  ##
+  # Returns true or false, if the event is already over or not
+  #
+  # ====Returns
+  # * +true+ -> If the event is over
+  # * +false+ -> If the event is not over yet
+  def ended?
+    end_date < Time.current
+  end
+
   private
 
   # Returns a different html colour for every i and consecutive colors are

app/models/event.rb

@@ -21,6 +21,7 @@ class Event < ApplicationRecord
   has_many :votes, dependent: :destroy
   has_many :voters, through: :votes, source: :user
   has_many :commercials, as: :commercialable, dependent: :destroy
+  has_many :surveys, as: :surveyable, dependent: :destroy
   belongs_to :event_type
 
   has_many :events_registrations

app/models/survey.rb

@@ -5,12 +5,30 @@ class Survey < ActiveRecord::Base
   has_many :survey_questions, dependent: :destroy
   has_many :survey_submissions, dependent: :destroy
 
-  enum target: [:after_conference, :during_registration]
+  enum target: [:after_conference, :during_registration, :after_event]
   validates :title, presence: true
 
+  ##
+  # Finds active surveys
+  # * if a survey has either start or end date, but not both
+  # check is performed only on the attribute that exists
+  # * if a survey does not have start/end dates, then it is marked active
+  # further check is expected, where appropriate, depending on the survey's target
+  # ====Returns
+  # * +true+ -> If the survey is active (will accept replies)
+  # * +false+ -> If the survey is closed
   def active?
-    return false unless start_date && end_date
-    now = Time.now.in_time_zone(surveyable.timezone)
-    now >= start_date && now <= end_date
+    return true unless start_date || end_date
+    # Find timezone of conference (survyeable is Conference or Event)
+    timezone = surveyable.is_a?(Conference) ? surveyable.timezone : surveyable.conference.timezone
+    now = Time.current.in_time_zone(timezone)
+
+    if start_date && end_date
+      now >= start_date && now <= end_date
+    elsif start_date && !end_date
+      now >= start_date
+    elsif !start_date && end_date
+      now <= end_date
+    end
   end
 end