How to add new attribute to ActiveRecord

Question

After getting all values from model, I want to add another custom attribute to the ActiveRecord class (this attribute is not a column in db) so that I could use it in view, but

Answer 1

I met the same issue. and successfully bypass using instance_eval

@test.all

@test.each do |elm|
  elm.instance_eval { @newatt = 'added string' }
end

normally it doesn't run into issue, when use attr_accessor. it appears when other DSL override "newattr=" which cause the issue. In my case, it's money-rails "monetize :newatt"

Explicitly use write_attribute doesn't work as it is the reason to raise exception in rails 4.x