app/services/affinity_groups_hierarchy.rb

@@ -0,0 +1,27 @@
+class AffinityGroupsHierarchy < Array
+  include Singleton
+
+  def initialize
+    super
+    @references = {}
+  end
+
+  def find(name)
+    @references[name]
+  end
+
+  def <<(name)
+    new_node = Tree::TreeNode.new(name)
+    super(new_node).tap { @references[name] = new_node }
+  end
+
+  def register_child(parent_name, child_name)
+    @references[parent_name] << Tree::TreeNode.new(child_name).tap { |child_node| @references[child_name] = child_node }
+  end
+
+  def distance(name_a, name_b)
+    return nil if @references[name_a].nil? || @references[name_b].nil?
+
+    @references[name_a].distance_to_common_ancestor(@references[name_b])
+  end
+end

config/initializers/affinity_groups.rb

@@ -0,0 +1,39 @@
+require_relative '../../app/services/affinity_groups_hierarchy'
+
+hierarchy = AffinityGroupsHierarchy.instance
+
+hierarchy << 'guests_a'
+hierarchy << 'guests_b'
+hierarchy << 'common_guests'
+
+hierarchy.register_child('guests_a', 'family_a')
+hierarchy.register_child('family_a', 'close_family_a')
+hierarchy.register_child('family_a', 'cousins_a')
+hierarchy.register_child('family_a', 'relatives_a')
+
+hierarchy.register_child('guests_a', 'work_a')
+hierarchy.register_child('work_a', 'besties_work_a')
+
+hierarchy.register_child('guests_a', 'friends_a')
+hierarchy.register_child('friends_a', 'college_friends_a')
+hierarchy.register_child('friends_a', 'high_school_friends_a')
+hierarchy.register_child('friends_a', 'childhood_friends_a')
+
+hierarchy.register_child('guests_a', 'sports_a')
+hierarchy.register_child('sports_a', 'basket_team_a')
+hierarchy.register_child('sports_a', 'football_team_a')
+
+hierarchy.register_child('guests_b', 'family_b')
+hierarchy.register_child('family_b', 'close_family_b')
+hierarchy.register_child('family_b', 'cousins_b')
+hierarchy.register_child('family_b', 'relatives_b')
+
+hierarchy.register_child('guests_b', 'work_b')
+hierarchy.register_child('work_b', 'besties_work_b')
+
+hierarchy.register_child('guests_b', 'friends_b')
+hierarchy.register_child('friends_b', 'college_friends_b')
+hierarchy.register_child('friends_b', 'high_school_friends_b')
+hierarchy.register_child('friends_b', 'childhood_friends_b')
+
+hierarchy.register_child('common_guests', 'dance_club')

db/seeds.rb

@@ -28,19 +28,26 @@ Expense.create!(name: 'Transportation', amount: 3000, pricing_type: 'fixed')
 Expense.create!(name: 'Invitations', amount: 200, pricing_type: 'fixed')
 Expense.create!(name: 'Cake', amount: 500, pricing_type: 'fixed')
 
+
 samples = {
-  close_family: 10,
+  close_family_a: 10,
-  family_1_group_a: 5,
+  close_family_b: 10,
-  family_1_group_b: 5,
+  cousins_a: 20,
-  family_2_group_a: 7,
+  cousins_b: 15,
-  family_2_group_b: 15,
+  relatives_a: 15,
-  previous_company: 5,
+  relatives_b: 10,
-  new_company: 20,
+  work_a: 10,
-  college: 10,
+  work_b: 10,
-  high_school: 5,
+  besties_work_a: 5,
-  childhood: 5,
+  besties_work_b: 5,
-  basket_team: 20,
+  college_friends_a: 10,
-  soccer_team: 15,
+  college_friends_b: 10,
+  high_school_friends_a: 10,
+  high_school_friends_b: 10,
+  childhood_friends_a: 10,
+  childhood_friends_b: 10,
+  basket_team_a: 10,
+  football_team_a: 15,
   dance_club: 10
 }.each_with_object([]) do |(affinity_group, count), acc|
   count.times { acc << affinity_group }
@@ -56,6 +63,7 @@ end
   guest.save!
 end
 
+# Add unbreakable bonds
 Guest.affinity_group_counts.each do |group|
   couples = (group.taggings_count / 4).floor