I can confirm that fixes it locally. Sorry for the misleading/confused bug 
report!

--Todd

On Friday, October 31, 2014 4:40:09 PM UTC-7, Todd Berman wrote:
> https://github.com/swannodette/om/blob/master/src/om/core.cljs#L770 looks 
> like the bug. It appears that it should pass parent into ref-sub-cursor, 
> which would prevent this.
> 
> --Todd
> 
> On Friday, October 31, 2014 4:31:04 PM UTC-7, Todd Berman wrote:
> > Additional debugging shows that state has nothing to do with anything. When 
> > I edit the answer title of an existing question, I get the same error. It 
> > just is guaranteed to happen during creation (duh).
> > 
> > --Todd
> > 
> > On Friday, October 31, 2014 4:28:25 PM UTC-7, Todd Berman wrote:
> > > Very possible.
> > > 
> > > 
> > > 
> > > 
> > > Basically, I have this structure:
> > > 
> > > 
> > > 
> > > 
> > > Question
> > > 
> > >   Answer
> > > 
> > >     Editable
> > > 
> > > 
> > > 
> > > 
> > > Question gets a cursor that it uses only to get the id of the question to 
> > > show, and uses a ref-cursor to grab the actual data from a friendly API.
> > > 
> > > 
> > > 
> > > 
> > > It then passes a sub cursor to Answer (because a Question may have N 
> > > answers), which in turn uses editable.
> > > 
> > > 
> > > 
> > > 
> > > There is one pattern (creating a new question) where I get an exception 
> > > thrown because parent is null (which prompted this email, and it turns 
> > > out has nothing to do with ref-sub-cursor implementing IOmRef, so I 
> > > apologize for the increasingly misnamed subject).
> > > 
> > > 
> > > 
> > > 
> > > Unclear how I get into that state, or what I can do to debug it.
> > > 
> > > 
> > > 
> > > 
> > > —Todd
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > On Fri, Oct 31, 2014 at 4:23 PM, David Nolen <[email protected]> 
> > > wrote:
> > > 
> > > Sub cursors from an IOmRef instance won't themselves be IOmRefs. For
> > > 
> > > the time being we're going to stick to this.
> > > 
> > > 
> > > I'd like to hear a lot more details about the use case before changing
> > > 
> > > my mind. It seems to me if you really need sub cursors to be ref
> > > 
> > > cursors you are not writing the API that you need for you application
> > > 
> > > and piggiebacking on ref cursors in an unintended way.
> > > 
> > > 
> > > David
> > > 
> > > 
> > > On Sat, Nov 1, 2014 at 12:10 AM, Todd Berman <[email protected]> wrote:
> > > 
> > > > I am running into an issue where it appears that a ref-sub-cursor 
> > > > (https://github.com/swannodette/om/blob/master/src/om/core.cljs#L763) 
> > > > should implement IOmRef, as it appears that -refresh-deps! is being 
> > > > called against it, which won't work.
> > > 
> > > >
> > > 
> > > > I am able to make this happen when creating a reference cursor, passing 
> > > > a sub cursor to a component, and then having that get passed to a third 
> > > > component (basically, following the editable paradigm from the 
> > > > tutorials).
> > > 
> > > >
> > > 
> > > > I am still a relative newbie when it comes to the Om internals, so 
> > > > unclear why this is happening in one case, but not in others.
> > > 
> > > >
> > > 
> > > > --Todd
> > > 
> > > >
> > > 
> > > > --
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> > > > your first post.
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