Add owner method to Stage, Group and Match

app/models/group.rb

@@ -5,6 +5,8 @@ class Group < ApplicationRecord
   has_many :matches, dependent: :destroy
   has_many :group_scores, dependent: :destroy
 
+  delegate :owner, to: :stage
+
   def teams
     matches.map(&:teams).flatten.uniq
   end

app/models/match.rb

@@ -15,6 +15,10 @@ class Match < ApplicationRecord
     match_scores.map(&:team).flatten.uniq
   end
 
+  def owner
+    stage ? stage.owner : group.owner
+  end
+
   private
 
   def stage_xor_group

app/models/stage.rb

@@ -5,6 +5,8 @@ class Stage < ApplicationRecord
   has_many :matches, dependent: :destroy
   has_many :groups, dependent: :destroy
 
+  delegate :owner, to: :tournament
+
   def teams
     return matches.map(&:teams).flatten.uniq unless matches.size.zero?