Need help with random error

I’ve got a rails app that acts as a backend to a Flex frontend. Mostly
it
serves xml back to the frontend. The app performs well, until I run a
performance test on it. Even using a 1 client request, I start getting
random errors, but they all stem from the same piece of code.

In the controller, it’s this line:

render :xml=>p.to_xml(:dasherize=>false)
ac
I’ve narrowed it down to one line of code in the xml_serialization.rb
file
at line 278 in the compute type function:

type = @record.class.columns_hash[name].type

If I comment this line out and return a hardcoded type of :string, the
errors go away. If I uncomment this line and return a hardcoded type of
:string, the errors come back.

In my error logs, it says the error EINVAL (invalid argument) occurs in
the
‘write’, but I don’t see a write there.

I’m not sure where to look to next. Any help would be appreciated.
Thanks

Marlon


“Tradin’ my time for the pay I get,
Livin’ on money that I ain’t made yet,
Gotta keep going, gotta find my way,
But I’ll live for the end of the day.”

Well, I think I might have figured it out. I was doing a to_xml method
on a
model that I was using a find_by_sql. I inadvertently included a lookup
table that wasn’t a model in my program. Whenever the to_xml method was
called, the field return a NilClass as the type and it seems that under
load, this caused errors in rails intermittently.

On 2/8/07, Marlon M. [email protected] wrote:

I’ve narrowed it down to one line of code in the xml_serialization.rb file

But I’ll live for the end of the day."

“Tradin’ my time for the pay I get,
Livin’ on money that I ain’t made yet,
Gotta keep going, gotta find my way,
But I’ll live for the end of the day.”

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