Disable protected attributes in ActiveRecordHelper forms (See related posts)

def attr_protected?(record, column)
  o = instance_variable_get("@#{record}")
  o && o.class.protected_attributes &&
      o.class.protected_attributes.include?(column.name.to_sym)
end

def default_input_block
  Proc.new { |record, column|
    options = attr_protected?(record, column) ? {:disabled => true} : {}
    <<-"end_html" 
      <p>
        <label for="#{record}_#{column.name}">#{column.human_name}</label>
        <br />
        #{input(record, column.name, options)}
      </p>
    end_html
  }
end

class Item < ActiveRecord::Base
  attr_protected :created_at
end