Undefined method #key? for nil:NilClass

[TheStranjer]

This method crashes on self.class.encrypted_attributes.key?.

def perform_attribute_assignment(method, new_attributes, *args)
  return if new_attributes.blank?

  send method, new_attributes.reject { |k, _|  self.class.encrypted_attributes.key?(k.to_sym) }, *args
  send method, new_attributes.reject { |k, _| !self.class.encrypted_attributes.key?(k.to_sym) }, *args
end

I was using this in a migration when I got this issue.

[movermeyer]

I had a similar errors when trying to upgrade to Rails 7:

NoMethodError: undefined method `key?' for nil:NilClass
 
              send method, new_attributes.reject { |k, _|  self.class.encrypted_attributes.key?(k.to_sym) }, *args
                                                                                          ^^^^^
/tmp/bundle/ruby/3.1.0/gems/attr_encrypted-3.1.0/lib/attr_encrypted/adapters/active_record.rb:28:in `block in perform_attribute_assignment'
/tmp/bundle/ruby/3.1.0/gems/attr_encrypted-3.1.0/lib/attr_encrypted/adapters/active_record.rb:28:in `reject'
/tmp/bundle/ruby/3.1.0/gems/attr_encrypted-3.1.0/lib/attr_encrypted/adapters/active_record.rb:28:in `perform_attribute_assignment'
/tmp/bundle/ruby/3.1.0/gems/attr_encrypted-3.1.0/lib/attr_encrypted/adapters/active_record.rb:36:in `assign_attributes'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/core.rb:468:in `initialize'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/inheritance.rb:75:in `new'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/inheritance.rb:75:in `new'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/relation.rb:862:in `_new'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/relation.rb:71:in `block in new'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/relation.rb:881:in `_scoping'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/relation.rb:428:in `scoping'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/relation.rb:71:in `new'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/relation.rb:227:in `find_or_initialize_by'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/querying.rb:22:in `find_or_initialize_by'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/internal_metadata.rb:31:in `[]='
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/schema.rb:63:in `define'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/schema.rb:50:in `define'
/app/db/schema.rb:13:in `<top (required)>'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:377:in `load'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:377:in `load_schema'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:482:in `block in load_schema_current'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:557:in `block (2 levels) in each_current_configuration'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:554:in `each'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:554:in `block in each_current_configuration'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:553:in `each'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:553:in `each_current_configuration'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/tasks/database_tasks.rb:481:in `load_schema_current'
/tmp/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/railties/databases.rake:470:in `block (3 levels) in <top (required)>'
/tmp/bundle/ruby/3.1.0/gems/bugsnag-6.24.2/lib/bugsnag/integrations/rake.rb:20:in `execute'
/tmp/bundle/ruby/3.1.0/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
/usr/local/ruby/bin/bundle:25:in `load'
/usr/local/ruby/bin/bundle:25:in `<main>'

Instead of getting set to {} (as it does in Rails 6), encrypted_attributes isn't being set.

[movermeyer]

It seems to collide with Rails 7's new encrypted_attributes class variable.

https://edgeguides.rubyonrails.org/active_record_encryption.html

[erluti]

I was able to use this blog post to remove attr_encrypted from my rails 7 upgrade of my app
https://pagertree.com/blog/migrate-attr_encrypted-to-rails-7-active-record-encrypts