March 2011 - web-devel

Mongo for Yesod?
by Rick Richardson 26 Mar '11

26 Mar '11

I hear rumor of a persistent-mongo. I've found http://hpaste.org/fastcgi/hpaste.fcgi/view?id=25669 but is there a more current version? I helped build the haskell mongodb driver which became the official one, so I know a few things about it. Also, I have some data structures to store for my website and would really prefer not to put them into a relational database. If there is a more current version of the code, could I take a crack at polishing it up? Thanks, Rick "The greatest obstacle to discovering the shape of the earth, the continents, and the oceans was not ignorance but the illusion of knowledge." - Daniel J. Boorstin

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Re: [web-devel] yesod, wai-handler-devel with persistent-postgresql
by Max Cantor 26 Mar '11

26 Mar '11

Forwarding to web-devel where the experts loiter about. What happens if you just build a binary and run that? Often, these kinds of things can be library issues. Sometimes just deleting .ghc and rebuilding all your libraries fixes the issue. max On Mar 26, 2011, at 10:23 AM, Lu Zhuo Ming wrote: > Hi, > > For those who is using this combination, do you ever encounter the following problem? > > $wai-handler-devel 3000 MyApp withMyApp > Attempting to interpret your app... > Trace/BPT trap > > Then it terminates abruptly. > > Switching to persistent-sqlite or runhaskell, it goes back to normal. > > Any idea? > > Kenny

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Re: [web-devel] Yesod renaming
by Aristid Breitkreuz 25 Mar '11

25 Mar '11

It's scary? I don't even know what "Yesod" means, and it sounds totally and utterly neutral to me, not scary at all. But it is easy to remember anyways, due to being very distinctive. What makes it sound scary to you? 2011/3/25 Felipe Almeida Lessa <felipe.lessa(a)gmail.com> > On Fri, Mar 25, 2011 at 10:35 PM, Aristid Breitkreuz > <aristidb(a)googlemail.com> wrote: > > What's wrong with people just pronouncing "Yesod" differently? In my > head, > > it's yeh-sodd and if it's yee-sode for you, fine. > > I don't have any problems with pronounciation as well. It is also an > easy-to-fix problem, just put it on Yesod's front page. > > However "Yesod" does seem scary, probably more than "monad" =). IMHO > we should have a Call for Names and then have a poll. "Yesod" has > very clear advantages, but should we find something nicer, it's better > to change names now than later. > > Cheers! > > -- > Felipe. >

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Re: [web-devel] Web framework comparison
by Henning Thielemann 25 Mar '11

25 Mar '11

Zachary Kessin schrieb: > Is there an easy way to cut and paste it there, I don't mind moving it, > but I don't want to have to reformat the entire thing. Using some editor macros I generated: http://www.haskell.org/haskellwiki/Web_framework_survey

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How to deploy an executable ?
by vagif.verdi＠gmail.com 24 Mar '11

24 Mar '11

This is totally a noob question. But i do have a problem. I create an executable of yesod app using cabal configure -fproduction and then cabal build. It runs fine on my dev pc (archlinux) Then i copy it via ssh to remote server (ubuntu) and try to run there. It gives me this error: bash: ./app-production: cannot execute binary file I checked and yes executable permissions are set on that file. Are there any other files i need to copy ? That server has no ghc installed at all. Regards, Vagif Verdi

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Re: [web-devel] GHCi runtime linker: fatal error: I found a duplicate definition for symbol (Yesod)
by Rick Richardson 24 Mar '11

24 Mar '11

I think that butterfly effect piece pretty much exactly described my problems with trying to install yesod and warp. Installing one would uninstall the other. On Thu, Mar 24, 2011 at 12:56 PM, Thomas Hartman < thomashartman1(a)googlemail.com> wrote: > I'm not sure but my guess is these problems are caused by underlying > problem in cabal. See > > > http://cdsmith.wordpress.com/2011/01/21/a-recap-about-cabal-and-haskell-lib… > http://cdsmith.wordpress.com/2011/01/17/the-butterfly-effect-in-cabal/ > > On Thu, Mar 24, 2011 at 9:50 AM, Rick Richardson > <rick.richardson(a)gmail.com> wrote: > > Thanks. So what exactly is the real issue? Is something requiring > multiple > > versions of Network as indicated above, or is it a more 'permanent' > problem? > > > > > > On Thu, Mar 24, 2011 at 2:54 AM, Michael Snoyman <michael(a)snoyman.com> > > wrote: > >> > >> What Blake suggests in the right solution, except for two points > >> (which are beyond his control): > >> > >> * It's a bit unfair to make users remember to install yesod with > >> -fproduction. > >> * wai-handler-devel does not handle Hamlet dependency tracking. That > >> means that if you use Blake's suggestion and then modify your Hamlet > >> templates, your code will not be reloaded. > >> > >> So I've released new versions of wai-handler-devel (0.2.1) and yesod > >> (0.7.2). There's no such thing as the -fproduction flag to yesod: it > >> will never build against wai-handler-devel. When you call the > >> develServer function, it will simply print out a message apologizing > >> that it cannot fulfill your request, and will tell you to install > >> wai-handler-devel >= 0.2.1 and run a command such as: > >> > >> wai-handler-devel 3000 Controller withTest --yesod > >> > >> Notice that extra --yesod at the end? That's the new feature in 0.2.1. > >> I moved the Hamlet dependency checking code from yesod to > >> wai-handler-devel. So now, if you run your application this way, > >> Hamlet changes will automatically result in a reload of your code. > >> > >> I tried to set up the develServer function to automatically run > >> wai-handler-server, but it resulted in the same error messages from > >> GHC. Oh well. I image in future versions of the scaffolding tool, the > >> devel-server.hs function will do all this for you automatically. > >> > >> Please let me know if this new approach causes any issues. > >> > >> Michael > >> > >> On Thu, Mar 24, 2011 at 1:00 AM, Blake Rain <blake.rain(a)gmail.com> > wrote: > >> > I too had a the same problem with duplicate symbols from libHSghc, and > >> > it seems to be a problem with yesod's dynamic server (or perhaps with > >> > Hint). > >> > > >> > My solution was first to remove the dependency on wai-handler-devel in > >> > the yesod package by using the 'production' flag, like so: > >> > > >> > $ cabal install yesod -fproduction > >> > > >> > For running a dynamic server, the wai-handler-devel package installs > an > >> > executable called wai-handler-devel. You can use this rather than the > >> > "runhaskell devel-server.hs" by providing the port, module and > function > >> > from your "devel-server.hs" file as arguments: > >> > > >> > $ wai-handler-devel 3000 MySiteModule withMySite > >> > > >> > The dynamic recompilation of wai-handler-devel is very useful, and I > >> > hope this helps. > >> > > >> > On Wed, 2011-03-23 at 14:22 -0400, Rick Richardson wrote: > >> >> I removed all but network-2.2.1.0 and rebuilt everything, still no > >> >> luck. But I'm sure you have set me on the right track, I will > >> >> experiment with other permutations. > >> >> > >> >> > >> >> Thanks. > >> >> > >> >> > >> >> > >> >> > >> >> On Wed, Mar 23, 2011 at 1:27 PM, Anton Cheshkov <acheshkov(a)gmail.com > > > >> >> wrote: > >> >> Hi Rick! I got the the same error day ago on my server. > >> >> Probably it happens because you have two network packages in > >> >> you system. > >> >> > >> >> Try to compile all your packages only on network-2.2.1.10, > >> >> and delete package network-2.3 > >> >> > >> >> > >> >> Hope it helps you > >> >> > >> >> > >> >> 2011/3/23 Rick Richardson <rick.richardson(a)gmail.com> > >> >> > >> >> > >> >> > >> >> I just installed the generic 7.0.2 binary on Ubuntu > >> >> on both 32 bit and 64 bit machines. Then I rm'd > >> >> .ghc and .cabal then fetched the current haskell > >> >> platform. Built and installed. > >> >> > >> >> > >> >> After cabal installing all of the dependencies cabal > >> >> said were required for yesod, I run yesod.. the > >> >> script creates the project. > >> >> > >> >> > >> >> When executing runhaskell devel-server.hs I get this > >> >> message > >> >> > >> >> > >> >> GHCi runtime linker: fatal error: I found a duplicate > >> >> definition for symbol > >> >> ghczm7zi0zi2_AsmCodeGen_zdfMonadCmmOptM2_closure > >> >> whilst processing object file > >> >> > >> >> /usr/local/lib/ghc-7.0.2/ghc-7.0.2/libHSghc-7.0.2.a > >> >> This could be caused by: > >> >> * Loading two different object files which export > >> >> the same symbol > >> >> * Specifying the same object file twice on the > GHCi > >> >> command line > >> >> * An incorrect `package.conf' entry, causing some > >> >> object to be > >> >> loaded twice. > >> >> GHCi cannot safely continue in this situation. > >> >> Exiting now. Sorry. > >> >> > >> >> > >> >> > >> >> > >> >> it's the same on both 32 and 64 bit. > >> >> > >> >> > >> >> Any ideas? I am going to try to build 7.0.2 from > >> >> source to see if that fixes it. > >> >> > >> >> > >> >> _______________________________________________ > >> >> web-devel mailing list > >> >> web-devel(a)haskell.org > >> >> http://www.haskell.org/mailman/listinfo/web-devel > >> >> > >> >> > >> >> > >> >> > >> >> -- > >> >> Best regards, > >> >> Cheshkov Anton > >> >> Phone: +7 909 005 18 82 > >> >> Skype: cheshkov_anton > >> >> > >> >> > >> >> > >> >> _______________________________________________ > >> >> web-devel mailing list > >> >> web-devel(a)haskell.org > >> >> http://www.haskell.org/mailman/listinfo/web-devel > >> > > >> > > >> > > >> > _______________________________________________ > >> > web-devel mailing list > >> > web-devel(a)haskell.org > >> > http://www.haskell.org/mailman/listinfo/web-devel > >> > > > > > > > _______________________________________________ > > web-devel mailing list > > web-devel(a)haskell.org > > http://www.haskell.org/mailman/listinfo/web-devel > > > > >

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GHCi runtime linker: fatal error: I found a duplicate definition for symbol (Yesod)
by Rick Richardson 24 Mar '11

24 Mar '11

I just installed the generic 7.0.2 binary on Ubuntu on both 32 bit and 64 bit machines. Then I rm'd .ghc and .cabal then fetched the current haskell platform. Built and installed. After cabal installing all of the dependencies cabal said were required for yesod, I run yesod.. the script creates the project. When executing runhaskell devel-server.hs I get this message GHCi runtime linker: fatal error: I found a duplicate definition for symbol ghczm7zi0zi2_AsmCodeGen_zdfMonadCmmOptM2_closure whilst processing object file /usr/local/lib/ghc-7.0.2/ghc-7.0.2/libHSghc-7.0.2.a This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry. it's the same on both 32 and 64 bit. Any ideas? I am going to try to build 7.0.2 from source to see if that fixes it.

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ghc 7.02 cabal install yesod error
by vagif.verdi＠gmail.com 24 Mar '11

24 Mar '11

Hello Michael. The problem with yesod (wai-handler-devel) compiling on ghc 7.02. Is this something that can be addressed with a patch to yesod, or is it fixable only by recompiling ghc itself ? Regards, Vagif Verdi

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[Yesod][Persistent] FooIdEq,FooIdIn
by Katsutoshi Itoh 21 Mar '11

21 Mar '11

Hi I had often wanted FooIdIn, FooIdEq on Foo Persistent type. Would you support this by default? from japan.

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Caustom layouts for forms
by vagif.verdi＠gmail.com 20 Mar '11

20 Mar '11

There are few utility functions like fieldsToTable that contsruct a form in particular layout (one column table, divs etc.) But often we need to construct a form with custom layout. How do i get individual rendered form fields (in a list or map) to splice them into my template the way i see fit ? Regards, Vagif Verdi

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