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@@ -300,6 +300,8 @@ All these configuration options are delegated to the `I18n` library.
`config/environments/production.rb` which is generated by Rails. The
default value is true if this configuration is not set.
+* `config.active_record.belongs_to_required_by_default` is a boolean value and controls whether `belongs_to` association is required by default.
+
The MySQL adapter adds one additional configuration option:
* `ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans` controls whether Active Record will consider all `tinyint(1)` columns in a MySQL database to be booleans and is true by default.