On 19 February 2011 06:54, Shea Barton <[email protected]> wrote: > I have a system where uploads are stored in a database with a filename > based on the MD5 hash of the file contents. Following the logic of this, > I assigned upload_file_name to be a unique index in my migration. > > What I want to do is, whenever a user tries to upload a file whose md5 > hash already exists in the database, just redirect to that other record > rather than making a copy (which actually just throw an error because > upload_file_name is a unique index) > > So I put in my model: > > self = other_upload if other_upload = > Upload.find_by_upload_file_name(self[:upload_file_name]) > > which ActiveRecord doesn't let me do saying "Can't change the value of > self"
That is not an ActiveRecord issue it is a basic Ruby issue. Once you are inside an instance method I do not think there is any way of suddenly deciding you want to be in the method of a different object. You could put something like the above code in a method of the model that, rather than setting self, returns either itself or the alternative, then call that method from the controller. Colin -- 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.
