Belongs_to presence in Rails 5 not working

According to the issue re weird behaviour of config belongs_to_required_by_default, it seems like one of your other gems intervenes in ActiveRecord::Base and causes the bug.

One of workarounds to the issue is to move the line

config.active_record.belongs_to_required_by_default = true

from initializers directly into application.rb.

This worked for me smoothly.

New Rails 5 applications come with a new initializer in

config/initializers/active_record_belongs_to_required_by_default.rb

If you upgraded a Rails 4 application or created your application with a beta version of Rails 5, then that file might be missing.

The configuration in that file enables the feature in question:

# 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 it is introduced as a configuration option to ensure that apps# made on earlier versions of Rails are not affected when upgrading.Rails.application.config.active_record.belongs_to_required_by_default = true

Please check how belongs_to_required_by_default is configured in your application.

I faced with same problem.

You can move

config.active_record.belongs_to_required_by_default = false

to config/environments/needed_environment.rb or to config/application.rb

Helped for me!