but how would I do that since all the data is missing?

well, thanks for the help! I'll keep trying.

2011/1/22 Frederick Cheung <[email protected]>

>
>
> On Jan 22, 3:39 am, Pedro Bernardes <[email protected]> wrote:
> > This is exactly it, I'm trying to add the topics behavior to the default
> > behavior of universities and University.all just returns []
> >
> > How do I change the University? I was unable to find references to it.
> >
>
> I've only dabbled with mongomapper, but my understanding is that if
> you move from two separate collections to a single collection
> inheritance setup, you're going to need to move all the data from the
> old universities collection to the topics collection
>
> Fred
>
> > 2011/1/21 Frederick Cheung <[email protected]>
> >
> >
> >
> >
> >
> > > On Jan 21, 10:03 pm, Pedro Bernardes <[email protected]> wrote:
> > > > Hi, I'm new to this list and to rails, so I'm sorry if this subject
> is
> > > > repetead or too obvious.
> >
> > > > I have two models: Topic and University, both in production. I want
> to
> > > make
> > > > University to inherit from Topic, but when I do this:
> >
> > > >       University < Topic
> >
> > > > My universities data just disapear (and reapears if the changes are
> > > undone).
> >
> > > Are you trying to setup a single table inheritance type thing? When
> > > you say that your universities data disappears, do you mean that
> > > University.all no longer returns any data?
> > > Switching from your previous setup to a single table inheritance
> > > situation means that mongomapper will be looking in the topics
> > > collection when you do University.all, so I'm not surprised that your
> > > university data would appear to vanish, if you haven't done anything
> > > to move it from its previous collection.
> >
> > > Fred
> >
> > > > I'm using mongomapper and mongodb. The code is pretty big sp I'll
> post
> > > then
> > > > only if necessarily. I think this must be easy to solve.
> >
> > > > ps: I've tried the deprecated _type but didn't work.
> >
> > > > Thanks !
> >
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