Added slash command to close an issue as a duplicate. Closes #26372

1 files changed, 22 insertions, 0 deletions

diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index 9078b1f0983..c7e646222bb 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -46,6 +46,14 @@ class IssuableBaseService < BaseService
     SystemNoteService.change_time_spent(issuable, issuable.project, current_user)
   end
 
+  def create_issue_duplicate_note(issuable, original_issue)
+    SystemNoteService.mark_duplicate_issue(issuable, issuable.project, current_user, original_issue)
+  end
+
+  def create_cross_reference_note(noteable, mentioner)
+    SystemNoteService.cross_reference(noteable, mentioner, current_user)
+  end
+
   def filter_params(issuable)
     ability_name = :"admin_#{issuable.to_ability_name}"
 
@@ -58,6 +66,7 @@ class IssuableBaseService < BaseService
       params.delete(:assignee_ids)
       params.delete(:assignee_id)
       params.delete(:due_date)
+      params.delete(:original_issue_id)
     end
 
     filter_assignee(issuable)
@@ -209,6 +218,7 @@ class IssuableBaseService < BaseService
     change_state(issuable)
     change_subscription(issuable)
     change_todo(issuable)
+    change_issue_duplicate(issuable)
     toggle_award(issuable)
     filter_params(issuable)
     old_labels = issuable.labels.to_a
@@ -291,6 +301,18 @@ class IssuableBaseService < BaseService
     end
   end
 
+  def change_issue_duplicate(issuable)
+    original_issue_id = params.delete(:original_issue_id)
+    return if original_issue_id.nil?
+
+    original_issue = IssuesFinder.new(current_user).find(original_issue_id)
+    if original_issue.present?
+      create_issue_duplicate_note(issuable, original_issue)
+      close_service.new(project, current_user, {}).execute(issuable)
+      create_cross_reference_note(original_issue, issuable)
+    end
+  end
+
   def toggle_award(issuable)
     award = params.delete(:emoji_award)
     if award