Assign empty array if object_to_save is nil before pushing values to it

https://stackoverflow.com/questions/12163625/create-or-append-to-array-in-ruby

app/interactors/add_group_stage_to_tournament.rb

@@ -13,7 +13,7 @@ class AddGroupStageToTournament
       tournament.instant_finalists_amount, tournament.intermediate_round_participants_amount =
         TournamentService.calculate_default_amount_of_teams_advancing(tournament.playoff_teams_amount,
                                                                       group_stage.groups.size)
-      context.object_to_save = tournament
+      (context.object_to_save ||= []) << tournament
     rescue StandardError
       context.fail!
     end

app/interactors/add_playoffs_to_tournament.rb

@@ -13,7 +13,7 @@ class AddPlayoffsToTournament
         tournament.stages.concat playoff_stages
       end
       context.intermediate_stage = tournament.stages.find(&:intermediate_stage?)
-      context.object_to_save = [tournament]
+      (context.object_to_save ||= []) << tournament
     else
       context.fail!
     end

app/interactors/advance_teams_in_intermediate_stage.rb

@@ -9,6 +9,6 @@ class AdvanceTeamsInIntermediateStage
 
     intermediate_stage.matches.select { |m| m.state == 'single_team' }
                       .each { |match| PopulateMatchBelowAndSave.call(match: match) }
-    context.object_to_save << intermediate_stage
+    (context.object_to_save ||= []) << intermediate_stage
   end
 end

app/interactors/populate_match_below.rb

@@ -7,7 +7,7 @@ class PopulateMatchBelow
     match = context.match
     begin
       objects_to_save = PlayoffStageService.populate_match_below(match)
-      context.object_to_save = objects_to_save
+      (context.object_to_save ||= []) << objects_to_save
     rescue StandardError
       context.fail!
     end

app/interactors/update_groups_group_scores.rb

@@ -4,7 +4,7 @@ class UpdateGroupsGroupScores
   include Interactor
 
   def call
-    context.object_to_save = GroupStageService.update_group_scores(context.group)
+    (context.object_to_save ||= []) << GroupStageService.update_group_scores(context.group)
   rescue StandardError
     context.fail!
   end

spec/interactors/populate_match_below_interactor_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe PopulateMatchBelow, type: :interactor do
     end
 
     it 'provides the objects to save' do
-      expect(context.object_to_save).to match_array(@objects_to_save)
+      expect(context.object_to_save.flatten).to match_array(@objects_to_save.flatten)
     end
   end
 

spec/interactors/update_groups_group_scores_interactor_spec.rb

@@ -22,7 +22,7 @@ RSpec.describe UpdateGroupsGroupScores, type: :interactor do
     end
 
     it 'provides the objects to save' do
-      expect(context.object_to_save).to eq(@group_scores)
+      expect(context.object_to_save.flatten).to eq(@group_scores)
     end
   end