Reproduce the rails 5.1 compatiability issue

Rails 5.1 and above add automatic validation for belongs_to association. It is enabled by an initializer added to new projects. Adding that configuartion in dummy app will reproduce the issue in test case
merit-gem · Apr 23, 2018 · 27c4a5c · rectifyer · Jul 25, 2018 · tute
1 parent 4436e38
commit 27c4a5c
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diff --git a/lib/merit/models/active_record/merit/activity_log.rb b/lib/merit/models/active_record/merit/activity_log.rb
@@ -3,7 +3,7 @@ class ActivityLog < ActiveRecord::Base
     self.table_name = :merit_activity_logs
 
     belongs_to :action, class_name: 'Merit::Action'
-    belongs_to :related_change, polymorphic: true
+    belongs_to :related_change, polymorphic: true, optional: true
     has_one :sash, through: :related_change
 
     if show_attr_accessible?

diff --git a/test/dummy/config/initializers/new_framework_defaults.rb b/test/dummy/config/initializers/new_framework_defaults.rb
@@ -0,0 +1,3 @@
+if Rails.version >= "5.1"
+  Rails.application.config.active_record.belongs_to_required_by_default = true
+end