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jens wille

2007-Jan-04 16:49 UTC

uninitialized constant oddities

hi there!

unfortunately, we are repeatedly having problems with uninitialized
constants in our rails app (v1.1.6), which is running on a mongrel
cluster behind apache''s mod_proxy_balancer.

---- snip ----
NameError (uninitialized constant Base):
    [...]
    /app/models/image.rb:90:in `subclasses''
    /app/models/image.rb:98:in `subclass?''
    /app/models/image.rb:261:in `count''
    /app/controllers/image_controller.rb:95:in `list''
---- snip ----

"Base" is actually "Image::Base", defined in
lib/image/base.rb:
class Image::Base.

immediately after a mongrel_cluster restart it''s working for a few
requests, though. (approx. 4 requests, resulting from 4 mongrel
servers being run?) the strange thing just is that everything works
fine when run from script/console ... except when commenting out the
"require ''image/base''" from config/environment.rb!
-- how come?


code details are as follows:

app/controllers/image_controller.rb: class ImageController <
ApplicationController:

---- snip ----
  def list
    # Image.count is where all evil originates
    @images = ::Paginator.new(Image.count, 10) { |offset, per_page|
      Image.find(:all, :limit => per_page, :offset => offset)
    }.page(params[:page])
  end
---- snip ----


app/models/image.rb: class Image < Entity (Entity < ActiveRecord::Base):

---- snip ----
  def count
    return super if subclass?

    subclasses.inject(0) { |sum, klass|
      sum += klass.count
    }
  end

  def subclass?
    subclasses.include? self
  end

  # here''s where the uninitialized constant comes in
  def subclasses(table_must_exist = true)
    Image::Base.subclasses table_must_exist
  end
---- snip ----

any ideas on what might cause this (mis-)behaviour would be greatly
appreciated.

TIA & cheers
jens

-- 
Jens Wille, Dipl.-Bibl. (FH)
prometheus - Das verteilte digitale Bildarchiv für Forschung & Lehre
An St. Laurentius 4, 50931 Köln
Tel.: +49 (0)221 470-6668, E-Mail:
jens.wille-31N1O1AsgN5n68oJJulU0Q@public.gmane.org
http://www.prometheus-bildarchiv.de/

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jens wille

2007-Jan-05 16:46 UTC

head link

Re: uninitialized constant oddities [UPDATE]

we have just discovered that the problem only occurs in development
mode -- production mode works fine. so it seems certain constants
(modules/classes) "get lost" by rails'' (re-)loading behaviour
in
development mode. but how to overcome this issue? anyone care to
help us out on this one?

cheers
jens

jens wille [04/01/07 17:49]:> hi there!
> 
> unfortunately, we are repeatedly having problems with uninitialized
> constants in our rails app (v1.1.6), which is running on a mongrel
> cluster behind apache''s mod_proxy_balancer.
> 
> ---- snip ----
> NameError (uninitialized constant Base):
>     [...]
>     /app/models/image.rb:90:in `subclasses''
>     /app/models/image.rb:98:in `subclass?''
>     /app/models/image.rb:261:in `count''
>     /app/controllers/image_controller.rb:95:in `list''
> ---- snip ----
> 
> "Base" is actually "Image::Base", defined in
lib/image/base.rb:
> class Image::Base.
> 
> immediately after a mongrel_cluster restart it''s working for a few
> requests, though. (approx. 4 requests, resulting from 4 mongrel
> servers being run?) the strange thing just is that everything works
> fine when run from script/console ... except when commenting out the
> "require ''image/base''" from
config/environment.rb! -- how come?
> 
> 
> code details are as follows:
> 
> app/controllers/image_controller.rb: class ImageController <
> ApplicationController:
> 
> ---- snip ----
>   def list
>     # Image.count is where all evil originates
>     @images = ::Paginator.new(Image.count, 10) { |offset, per_page|
>       Image.find(:all, :limit => per_page, :offset => offset)
>     }.page(params[:page])
>   end
> ---- snip ----
> 
> 
> app/models/image.rb: class Image < Entity (Entity <
ActiveRecord::Base):
> 
> ---- snip ----
>   def count
>     return super if subclass?
> 
>     subclasses.inject(0) { |sum, klass|
>       sum += klass.count
>     }
>   end
> 
>   def subclass?
>     subclasses.include? self
>   end
> 
>   # here''s where the uninitialized constant comes in
>   def subclasses(table_must_exist = true)
>     Image::Base.subclasses table_must_exist
>   end
> ---- snip ----
> 
> any ideas on what might cause this (mis-)behaviour would be greatly
> appreciated.
> 
> TIA & cheers
> jens
> 
-- 
Jens Wille, Dipl.-Bibl. (FH)
prometheus - Das verteilte digitale Bildarchiv für Forschung & Lehre
An St. Laurentius 4, 50931 Köln
Tel.: +49 (0)221 470-6668, E-Mail:
jens.wille-31N1O1AsgN5n68oJJulU0Q@public.gmane.org
http://www.prometheus-bildarchiv.de/

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Paul Corcoran

2007-Jan-05 17:35 UTC

head link

Re: uninitialized constant oddities [UPDATE]

Hi Jen - have you tried Image::ActiveRecord::Base?

-Paul


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jens wille

2007-Jan-05 18:17 UTC

head link

Re: uninitialized constant oddities

hi paul!

Paul Corcoran [05.01.2007 18:35]:> Hi Jen - have you tried Image::ActiveRecord::Base?well, no... since the class in question is actually Image::Base, not
Image::ActiveRecord::Base. it''s only Image that /inherits/ from
ActiveRecord::Base, via Entity. so i assume the path is totally
correct - as running in production mode shows -, it''s just that this
class (Image::Base) seems to be "there" only immediately after
starting the mongrel servers (i.e., after loading the whole code
base) -- which appears quite strange to me.

i mean, why do i even have to require image/base in environment.rb
in order to get that constant? i don''t usually have to for other
classes and modules in lib/ (of course, there are other reasons why
i might have to do that, which apply to image/base, too). it seems
that this issue has in some way to do with the fact that Image
already is a model class. but in what way? and what can we do about
it? i''m kinda stuck...

cheers
jens

-- 
Jens Wille, Dipl.-Bibl. (FH)
prometheus - Das verteilte digitale Bildarchiv für Forschung & Lehre
An St. Laurentius 4, 50931 Köln
Tel.: +49 (0)221 470-6668, E-Mail:
jens.wille-31N1O1AsgN5n68oJJulU0Q@public.gmane.org
http://www.prometheus-bildarchiv.de/

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rovnak

2007-Jan-06 05:33 UTC

head link

Re: uninitialized constant oddities

I will jump in here, with more of a question than an answer. I am
totally new to rails. Have developed an app locally on my laptop. It
works fine. I just tried to set up my web host environment for the
first time and it seems that ALL of my application classes are not
being found when I run in production environment. Furthermore, in the
"script/console production" , when I try to run Rails:Info I  get
NameError: uninitialized constant Rails::Info. Any quick tips for a
newbie?

On Jan 5, 9:17 pm, jens wille
<jens.wi...-31N1O1AsgN5n68oJJulU0Q@public.gmane.org>
wrote:> hi paul!
>
> Paul Corcoran [05.01.2007 18:35]:> Hi Jen - have you tried
Image::ActiveRecord::Base?well, no... since the class in question is actually
Image::Base, not
> Image::ActiveRecord::Base. it''s only Image that /inherits/ from
> ActiveRecord::Base, via Entity. so i assume the path is totally
> correct - as running in production mode shows -, it''s just that
this
> class (Image::Base) seems to be "there" only immediately after
> starting the mongrel servers (i.e., after loading the whole code
> base) -- which appears quite strange to me.
>
> i mean, why do i even have to require image/base in environment.rb
> in order to get thatconstant? i don''t usually have to for other
> classes and modules in lib/ (of course, there are other reasons why
> i might have to do that, which apply to image/base, too). it seems
> that this issue has in some way to do with the fact that Image
> already is a model class. but in what way? and what can we do about
> it? i''m kinda stuck...
>
> cheers
> jens
>
> --
> Jens Wille, Dipl.-Bibl. (FH)
> prometheus - Das verteilte digitale Bildarchiv für Forschung & Lehre
> An St. Laurentius 4, 50931 Köln
> Tel.: +49 (0)221 470-6668, E-Mail:
jens.wi...-31N1O1AsgN5SPdVFqHYbYQ@public.gmane.org://www.prometheus-bildarchiv.de/

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rovnak

2007-Jan-06 06:28 UTC

head link

Re: uninitialized constant oddities

nevermind :) Pilot error copying files onto web host was my problem.

On Jan 6, 8:33 am, "rovnak"
<donloga...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> I will jump in here, with more of a question than an answer. I am
> totally new to rails. Have developed an app locally on my laptop. It
> works fine. I just tried to set up my web host environment for the
> first time and it seems that ALL of my application classes are not
> being found when I run in production environment. Furthermore, in the
> "script/console production" , when I try to run Rails:Info I  get
> NameError: uninitialized constant Rails::Info. Any quick tips for a
> newbie?
>
> On Jan 5, 9:17 pm, jens wille
<jens.wi...-31N1O1AsgN5n68oJJulU0Q@public.gmane.org> wrote:
>
> > hi paul!
>
> > Paul Corcoran [05.01.2007 18:35]:> Hi Jen - have you tried
Image::ActiveRecord::Base?well, no... since the class in question is actually
Image::Base, not
> > Image::ActiveRecord::Base. it''s only Image that /inherits/
from
> > ActiveRecord::Base, via Entity. so i assume the path is totally
> > correct - as running in production mode shows -, it''s just
that this
> > class (Image::Base) seems to be "there" only immediately
after
> > starting the mongrel servers (i.e., after loading the whole code
> > base) -- which appears quite strange to me.
>
> > i mean, why do i even have to require image/base in environment.rb
> > in order to get thatconstant? i don''t usually have to for
other
> > classes and modules in lib/ (of course, there are other reasons why
> > i might have to do that, which apply to image/base, too). it seems
> > that this issue has in some way to do with the fact that Image
> > already is a model class. but in what way? and what can we do about
> > it? i''m kinda stuck...
>
> > cheers
> > jens
>
> > --
> > Jens Wille, Dipl.-Bibl. (FH)
> > prometheus - Das verteilte digitale Bildarchiv für Forschung &
Lehre
> > An St. Laurentius 4, 50931 Köln
> > Tel.: +49 (0)221 470-6668, E-Mail:
jens.wi...-31N1O1AsgN5SPdVFqHYbYQ@public.gmane.org://www.prometheus-bildarchiv.de/

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