undefined method `all_text_fields' for nil:NilClass

I am using Rails 2.1 and implemented Sunspot search. The server is running fine, but the problem is when I am searching for a text, it is showing an error like this:

undefined method `all_text_fields' for nil:NilClass

Can anybody 开发者_运维百科knowledgeable about the solution to this problem please help me?

Thank you.

---

That's most likely an error coming from inside the sunspot gem. It can occur if your model isn't setup right. Do you have a searchable block in the model you are trying to run a search on?

e.g.:

class Foo > ActiveRecord::Base
  searchable do
    integer :size
  end
end