AO3-5052 Update series byline on username or pseud update

app/models/pseud.rb

@@ -399,7 +399,8 @@ def check_default_pseud
 
   def expire_caches
     if saved_change_to_name?
-      self.works.each{ |work| work.touch }
+      works.touch_all
+      series.touch_all
     end
   end
 

app/models/user.rb

@@ -158,6 +158,7 @@ class User < ApplicationRecord
 
   def expire_caches
     return unless saved_change_to_login?
+    series.touch_all
     self.works.each do |work|
       work.touch
       work.expire_caches

features/other_a/pseuds.feature

@@ -173,3 +173,21 @@ Scenario: Many pseuds
   When there are 10 pseuds per page
     And I view my profile
   Then I should see "Zaphod, Agrajag, Betelgeuse, and Slartibartfast" within "dl.meta"
+
+Scenario: Edit pseud updates series blurbs
+
+  Given I am logged in as "Myself"
+    And I add the work "Great Work" to series "Best Series" as "Me2"
+  When I go to the dashboard page for user "Myself" with pseud "Me2"
+    And I follow "Series"
+  Then I should see "Best Series by Me2 (Myself)"
+
+  When I go to my profile page
+    And I follow "Manage My Pseuds"
+    And I follow "Edit Me2"
+    And I fill in "Name" with "Me3"
+    And I press "Update"
+  Then I should see "Pseud was successfully updated."
+
+  When I follow "Series"
+  Then I should see "Best Series by Me3 (Myself)"

features/users/user_rename.feature

@@ -147,3 +147,19 @@ Feature:
       And I view the work "Interesting" with comments
     Then I should see "after" within ".comment h4.byline"
       And I should not see "mine (before)"
+
+  Scenario: Changing username updates series blurbs
+    Given I have no users
+      And I am logged in as "oldusername" with password "password"
+      And I add the work "Great Work" to series "Best Series"
+    When I go to the dashboard page for user "oldusername" with pseud "oldusername"
+      And I follow "Series"
+    Then I should see "Best Series by oldusername"
+    When I visit the change username page for oldusername
+      And I fill in "New user name" with "newusername"
+      And I fill in "Password" with "password"
+      And I press "Change User Name"
+    Then I should get confirmation that I changed my username
+      And I should see "Hi, newusername"
+    When I follow "Series"
+    Then I should see "Best Series by newusername"

spec/models/pseud_spec.rb

@@ -66,6 +66,20 @@
     end
   end
 
+  describe "expire_caches" do
+    let(:pseud) { create(:pseud) }
+    let(:series) { create(:series, authors: [pseud]) }
+
+    it "modifies the updated_at of associated series" do
+      pseud.reload
+      series.reload
+      travel(1.day)
+      expect do
+        pseud.update(name: "New Name")
+      end.to change { series.reload.updated_at }
+    end
+  end
+
   describe ".default_alphabetical" do
     let(:user) { create(:user, login: "Zaphod") }
     let(:subject) { user.pseuds.default_alphabetical }