railties/lib/rails/generators/rails/app/templates/config/initializers/active_record_belongs_to_required_by_default.rb


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# Be sure to restart your server when you modify this file.

# Require `belongs_to` associations by default. This is a new Rails 5.0 default, 
# so introduced as a config to ensure apps made with earlier versions of Rails aren't affected when upgrading.
Rails.application.config.active_record.belongs_to_required_by_default = true