can't modify frozen Hash in rails3

Question

I'm getting the following error,

can't modify frozen Hash
/home/.rvm/gems/ruby-1.9.3-p327@ui/gems/activerecord-3.2.6/lib/active_r
ecord/attribute_methods/write.rb:38:in `[]='
/home/.rvm/gems/ruby-1.9.3-p327@ui/gems/activerecord-3.2.6/lib/active_r
ecord/attribute_methods/write.rb:38:in `write_attribute'

from this line

write_attribute(:value, new_value)

This can be run properly for certain days. But, now it fail continously with an above error. I tried out solution for that but nothing work for me.

Solution

As explained in comments, you cannot update attributes on destroyed objects.

Check with something like:

write_attribute(:value, new_value) unless destroyed?

Comments

[Admin]

Its working fine for me. But, if the condition fails the above error must return. how i overcome this?\

[apneadiving]

I can't see any other reason why it could happen

[D. Visser]

Of course there is a Model.destroyed? method, I should have known.