porting conditions hash to use in new rails 3 active record query interface

I am upgrading a Rails 2.3.5 app to Rails 3. I did not implemented the app, I am just upgrading it. I have found that the developer has used query hash in a way that it is difficult to change it without touching many files, which I want to avoid.

class A
    def method_1
        AnObject.find(:all, :conditions => {:param_1 => @param_1}.merge(specific_params))
    end

    def specific_params
       raise NoMethodError, "Subclasses must implement this method", "specific_params"
    end
end

class B < A
    def specific_params
        {param_B1 => false, param_B2 => true}
    end
end

There are many classes which inherit from A. I 开发者_如何学Cneed to convert the query in class A to Rails 3. Could somebody please suggest the best way to to port this to Rails 3 without changing the classes which inherit from A implement specific_params method.

Thanks.

---

AnObject.find(:all, :conditions => {:param_1 => @param_1}.merge(specific_params))

will work in Rails 3.

Or you could change it to where:

AnObject.where({:param_1 => @param_1}.merge(specific_params))