Expire related caches after changing HEAD

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/models/project.rb

@@ -1032,7 +1032,7 @@ class Project < ActiveRecord::Base
                                         "refs/heads/#{branch}",
                                         force: true)
     repository.copy_gitattributes(branch)
-    repository.expire_avatar_cache
+    repository.after_change_head
     reload_default_branch
   end
 

app/models/repository.rb

@@ -439,6 +439,11 @@ class Repository
     expire_content_cache
   end
 
+  # Runs code after the HEAD of a repository is changed.
+  def after_change_head
+    expire_method_caches(METHOD_CACHES_FOR_FILE_TYPES.keys)
+  end
+
   # Runs code after a repository has been forked/imported.
   def after_import
     expire_content_cache

changelogs/unreleased/pmq20-gitlab-ce-psvr-head-cache.yml

+---
+title: Expire related caches after changing HEAD
+merge_request:
+author: Minqi Pan

spec/models/project_spec.rb

@@ -1545,11 +1545,13 @@ describe Project, models: true do
     end
   end
 
-  describe 'change_head' do
+  describe '#change_head' do
     let(:project) { create(:project) }
 
-    it 'calls the before_change_head method' do
+    it 'calls the before_change_head and after_change_head methods' do
       expect(project.repository).to receive(:before_change_head)
+      expect(project.repository).to receive(:after_change_head)
+
       project.change_head(project.default_branch)
     end
 
@@ -1565,11 +1567,6 @@ describe Project, models: true do
       project.change_head(project.default_branch)
     end
 
-    it 'expires the avatar cache' do
-      expect(project.repository).to receive(:expire_avatar_cache)
-      project.change_head(project.default_branch)
-    end
-
     it 'reloads the default branch' do
       expect(project).to receive(:reload_default_branch)
       project.change_head(project.default_branch)

spec/models/repository_spec.rb

@@ -1150,6 +1150,24 @@ describe Repository, models: true do
     end
   end
 
+  describe '#after_change_head' do
+    it 'flushes the readme cache' do
+      expect(repository).to receive(:expire_method_caches).with([
+        :readme,
+        :changelog,
+        :license,
+        :contributing,
+        :version,
+        :gitignore,
+        :koding,
+        :gitlab_ci,
+        :avatar
+      ])
+
+      repository.after_change_head
+    end
+  end
+
   describe '#before_push_tag' do
     it 'flushes the cache' do
       expect(repository).to receive(:expire_statistics_caches)
@@ -1513,14 +1531,6 @@ describe Repository, models: true do
     end
   end
 
-  describe '#expire_avatar_cache' do
-    it 'expires the cache' do
-      expect(repository).to receive(:expire_method_caches).with(%i(avatar))
-
-      repository.expire_avatar_cache
-    end
-  end
-
   describe '#file_on_head' do
     context 'with a non-existing repository' do
       it 'returns nil' do