Is there an easy way to make a Rails ActiveRecord model read-only?

Question

I want to be able to create a record in the DB but then prevent Rails from making changes from that point on. I understand changes will still be possible at the DB level.

Answer 1

TL;DR for OP's

class YourModel < ActiveRecord::Base
  before_save { false } # prevent create & update, allows destroy

  # ... 
end

Generally

• To prevent creates only: before_create { false }
• To prevent updates only: before_update { false }
• To prevent destroys only: before_destroy { false } # does not prevent delete

See also: http://guides.rubyonrails.org/active_record_callbacks.html