On Nov 15, 12:27 pm, PandaR1 <[email protected]> wrote: > Hi > > This is difficult (for me, at least ;) ) > > I have a model named Measureunit and another named Vendor > > Each vendor has a measureunit for the currency it use, and the association > is currency > > In vendor.rb I have > belongs_to :currency, :class_name => "Measureunit" , :foreign_key => > "currency_id" > > How can I recover the class name from the association name (eg. I have the > string 'Currency' and I look for > a method that return 'Measureunit') > > I found class_name() and klass() but I can't figure the syntax...
I believe what you're saying is that you have the Vendor class, and the name of the association as a string, 'Currency'. You want to look at The ActiveRecord::Reflection documentation, specifically reflect_on_association (http://apidock.com/rails/ActiveRecord/ Reflection/ClassMethods/reflect_on_association). That gives you back an AssociationReflection, which has a bunch of information for you: http://apidock.com/rails/ActiveRecord/Reflection/AssociationReflection. Specifically again, you likely want klass on that, which should return the class of the association; do be aware that its a little bit more complex for polymorphic relationships if that's necessary to support. So in summary what you likely want is something like s = "Currency" association_name = s.underscore # Or whatever transformation takes your string to your association name reflection = Vendor.reflect_on_association(association_name) # Returns the AssociationReflection object reflection.klass # Returns the class object, in this case Measureunit HTH, \Peter -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
