Other way instead of this evil eval?

rubyonrails-talk
1

I am trying to do this, where associated_record_type is always of the name of a model, passed to the method:

record = eval(“#{associated_record_type}”).find_by_id(associated_record_id)

Is there a way to do this dynamically without using an eval?

2

record = associated_record_type.classify.constantize.find_by_id(associated_record_id)

3

Actually, you might be better off with just .constantize - depends what precise value you have in "associated_record_type"

record = associated_record_type.constantize.find_by_id(associated_record_id)

http://api.rubyonrails.org/v2.3.8/classes/ActiveSupport/CoreExtensions/String/Inflections.html

4

record = eval(“#{associated_record_type}”).find_by_id(associated_record_id)

Is there a way to do this dynamically without using an eval?

record = associated_record_type.classify.constantize.find_by_id(associated_record_id)

Actually, you might be better off with just .constantize - depends

what precise value you have in “associated_record_type”

Michael, thats just what I was looking for. It is a polymorphic situation and the value in the field is a string, so works out perfect. Thanks!