Add an entry for active_record.partial_inserts in new_framework_defaults

Author: byroot

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults_7_0.rb.tt

@@ -55,3 +55,8 @@
 
 # Raise when running tests if fixtures contained foreign key violations
 # Rails.application.config.active_record.verify_foreign_keys_for_fixtures = true
+
+# Disable partial inserts.
+# This default means that all columns will be referenced in INSERT queries
+# regardless of wether they have a default or not.
+# Rails.application.config.active_record.partial_inserts = false