Add private method for event export filename (#38454)

app/controllers/severed_relationships_controller.rb

@@ -13,13 +13,13 @@ class SeveredRelationshipsController < ApplicationController
 
   def following
     respond_to do |format|
-      format.csv { send_data following_data, filename: "following-#{@event.target_name}-#{@event.created_at.to_date.iso8601}.csv" }
+      format.csv { send_data following_data, filename: }
     end
   end
 
   def followers
     respond_to do |format|
-      format.csv { send_data followers_data, filename: "followers-#{@event.target_name}-#{@event.created_at.to_date.iso8601}.csv" }
+      format.csv { send_data followers_data, filename: }
     end
   end
 
@@ -48,4 +48,8 @@ class SeveredRelationshipsController < ApplicationController
   def acct(account)
     account.local? ? account.local_username_and_domain : account.acct
   end
+
+  def filename
+    "#{action_name}-#{@event.identifier}.csv"
+  end
 end

app/models/account_relationship_severance_event.rb

@@ -32,6 +32,10 @@ class AccountRelationshipSeveranceEvent < ApplicationRecord
 
   before_create :set_relationships_count!
 
+  def identifier
+    "#{target_name}-#{created_at.to_date.iso8601}"
+  end
+
   private
 
   def set_relationships_count!

spec/models/account_relationship_severance_event_spec.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+RSpec.describe AccountRelationshipSeveranceEvent do
+  describe 'Associations' do
+    it { is_expected.to belong_to(:account) }
+    it { is_expected.to belong_to(:relationship_severance_event) }
+    it { is_expected.to have_many(:severed_relationships).through(:relationship_severance_event) }
+  end
+
+  describe '#identifier' do
+    subject { account_relationship_severance_event.identifier }
+
+    let(:account_relationship_severance_event) { Fabricate.build :account_relationship_severance_event, relationship_severance_event:, created_at: DateTime.new(2026, 3, 15, 1, 2, 3) }
+    let(:relationship_severance_event) { Fabricate.build :relationship_severance_event, target_name: 'host.example' }
+
+    context 'with a hostname target and timestamp' do
+      it { is_expected.to eq('host.example-2026-03-15') }
+    end
+  end
+end