On Aug 9, 2011, at 5:43 PM, Chris Mear wrote: > On 9 Aug 2011, at 22:08, Peter Bell wrote: > As an aside: if your User has_one Profile, then normally you'd just access > that via User's instance method 'profile', which ActiveRecord provides. Is > there a particular reason you need to use a separate instance variable to > reference the profile?
Yeah - MongoMapper. I keep on running into issues with the has_one relationship, so I'm persisting a current_profile_id as an ObjectId and I need to handle the retrieval of the profile usine a Profile.find(current_profile_id) > >> How does Ruby actually call instance variables? Does it make sense for me to >> def a method to overload the getter for the current_profile instance >> variable that looks to see if the actual instance variable exists and if not >> finds/creates it? > > AFAIK, there isn't any way to hook into the access of an instance variable. > Overriding a getter method will only work if you only ever access that > instance variable via the getter method and not directly; unfortunately for > your case, ActiveSupport's Delegation module will generate code that accesses > your @current_profile instance variable directly. Hmmm, OK, thanks > As a first attempt, I'd probably just use ActiveRecord's after_initialize > hook in User to make sure I find/create a profile whenever a new User > instance is made. I can't find support for after_initialize in MM unfortunately (http://mongomapper.com/documentation/plugins/callbacks.html), but I can look for the closest possible on the MM list. > Not sure if that approach will play well with your factories, but then they > probably ought to be creating the Profile instance explicitly anyway. That's certainly something I can do. So probably use a callback for the runtime code and just pass in the object in the factories. Seems like a way I can go - thanks! Best WIshes, Peter > > Chris > > -- > 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. > -- 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.
