[Catalyst] Quesion about Chaining usage

[Matt S Trout]

John Napiorkowski wrote:
> I've notices what I think is somewhat strange behavior
> in a chain I've created, although as usual it might
> just be my ignorance.  Here's is a skeleton of the
> chain I made:
> 
> package myapp::Controller::Feedrolls
> 
> sub feedrolls :Chained('/') CaptureArgs(0){}
> 
> sub feedrolls_all :Chained('feedrolls') PathPart('')
> Args(0) {}
> 
> sub feedroll :Chained('feedrolls') PathPart('')
> CaptureArgs(1) { my ($self, $c, $captured) = @_; }
> 
> sub feedroll_all :Chained('feedroll') PathPart('')
> Args(0) {}
> 
> When I run catalyst I get a mapping like this:
> 
> (1) /feedrolls/*
> (2) /feedrolls
> 
> (1) chains from feedrolls to feedroll to feedroll_all
> and (2) chains from feedrolls to feedrolls_all.
> 
> Okay so far so good.  However when I try to call the
> action through the browser at
> "http://localhost/feedrolls" I get an error about the
> $captured variable being undefined, which is strange
> to me since I am thinking that to get to the
> containing sub I need to use an action link
> "/feedrolls/[feedroll_id]".  When I look at the debug
> output to see what is getting called I can see that
> indee that chain is going from feedrolls to feedroll
> to feedroll_all instead of from feedrolls to feedrolls
> all.
> 
> What is even stranger is that if I change the sub:
> 
> sub feedroll :Chained('feedrolls') PathPart('')
> CaptureArgs(1) { my ($self, $c, $captured) = @_; }
> 
> to 
> 
> sub feedroll :Chained('feedrolls') PathPart('')
> Args(1) { my ($self, $c, $captured) = @_; }
> 
> and handle all the processing there instead of the way
> I outlined it above, everything works as expected.
> 
> So there seems to be something strange here, since
> merely terminating the chain one sub earlier changes
> the ways things get called quite a bit.
> 
> So... Can anyone spot if there is something wrong in
> the way I am doing this?

Not without the startup debug output for your app showing the path part 
dispatch table ...

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