Fix Delegator Override Validator does not work without DB

.gitlab/ci/static-analysis.gitlab-ci.yml

@@ -35,6 +35,17 @@ static-analysis:
     paths:
       - tmp/feature_flags/
 
+static-analysis-with-database:
+  extends:
+    - .static-analysis-base
+    - .static-analysis:rules:ee-and-foss
+    - .use-pg12
+  stage: test
+  script:
+    - bundle exec rake lint:static_verification_with_database
+  variables:
+    SETUP_DB: "true"
+
 static-analysis as-if-foss:
   extends:
     - static-analysis

lib/gitlab/utils/delegator_override/validator.rb

@@ -51,7 +51,13 @@ module Gitlab
 
           # Workaround to fully load the instance methods in the target class.
           # See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69823#note_678887402
-          target_classes.map(&:new) rescue nil
+          begin
+            target_classes.map(&:new)
+          rescue ArgumentError
+            # Some models might raise ArgumentError here, but it's fine in this case,
+            # because this is enough to force ActiveRecord to generate the methods we
+            # need to verify, so it's safe to ignore it.
+          end
 
           (delegator_class.instance_methods - allowlist).each do |method_name|
             target_classes.each do |target_class|

lib/tasks/lint.rake

@@ -12,6 +12,13 @@ unless Rails.env.production?
       dev:load
     ] do
       Gitlab::Utils::Override.verify!
+    end
+
+    desc "GitLab | Lint | Static verification with database"
+    task static_verification_with_database: %w[
+      lint:static_verification_env
+      dev:load
+    ] do
       Gitlab::Utils::DelegatorOverride.verify!
     end