Stop relying on migrations in the CacheableAttributes cache key and cache attributes for 1 minute instead

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

app/models/concerns/cacheable_attributes.rb

@@ -7,7 +7,7 @@ module CacheableAttributes
 
   class_methods do
     def cache_key
-      "#{name}:#{Gitlab::VERSION}:#{Gitlab.migrations_hash}:#{Rails.version}".freeze
+      "#{name}:#{Gitlab::VERSION}:#{Rails.version}".freeze
     end
 
     # Can be overriden
@@ -69,6 +69,6 @@ module CacheableAttributes
   end
 
   def cache!
-    Rails.cache.write(self.class.cache_key, self)
+    Rails.cache.write(self.class.cache_key, self, expires_in: 1.minute)
   end
 end

changelogs/unreleased/48670-application-settings-may-not-be-invalidated-if-migrations-are-run.yml

@@ -0,0 +1,6 @@
+---
+title: Stop relying on migrations in the CacheableAttributes cache key and cache attributes
+  for 1 minute instead
+merge_request: 20389
+author:
+type: fixed

lib/gitlab.rb

@@ -9,10 +9,6 @@ module Gitlab
     Settings
   end
 
-  def self.migrations_hash
-    @_migrations_hash ||= Digest::MD5.hexdigest(ActiveRecord::Migrator.get_all_versions.to_s)
-  end
-
   def self.revision
     @_revision ||= begin
       if File.exist?(root.join("REVISION"))

spec/models/concerns/cacheable_attributes_spec.rb

@@ -52,7 +52,7 @@ describe CacheableAttributes do
 
   describe '.cache_key' do
     it 'excludes cache attributes' do
-      expect(minimal_test_class.cache_key).to eq("TestClass:#{Gitlab::VERSION}:#{Gitlab.migrations_hash}:#{Rails.version}")
+      expect(minimal_test_class.cache_key).to eq("TestClass:#{Gitlab::VERSION}:#{Rails.version}")
     end
   end