- web-devel - Haskell.org

yesod build failure on Mac
by Mark Wotton 12 May '11

12 May '11

cabal install yesod fails because certificate-0.9.0 won't build on Mac. -- A UNIX signature isn't a return address, it's the ASCII equivalent of a black velvet clown painting. It's a rectangle of carets surrounding a quote from a literary giant of weeniedom like Heinlein or Dr. Who. -- Chris Maeda

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How to expire session when browser is closed ?
by vagif.verdi＠gmail.com 12 May '11

12 May '11

Currently yesod provides clientSessionDuration settings. But i want to change it to expire session when browser is closed. How do i do that ? Regards, Vagif Verdi

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Message is not generated.
by vagif.verdi＠gmail.com 10 May '11

10 May '11

Yesod application runs fine on my dev pc, and shows message on html page (getMessage) after post-redirect. Same application moved to test env, works fine but does not show the message. The html page has everything except the message. I installed and reinstalled yesod and all libraries from scratch, removed all tmp files from static folder. Regards, Vagif Verdi

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Installing yesod with cabal
by Anakreon 10 May '11

10 May '11

Installation of yesod fails because the package language-javascript-0.4.4 fails to install. It requires happy although happy-1.18.6 is successfully installed with cabal. The operating system is linux with debian sid and ghc version 6.12.1, cabal-install version 0.8.2 using version 1.8.0.2 of the Cabal library. I searched for a google group on yesod and didn't find any. Except for this mailing list, is there any other way to seek help from the yesod community?

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I18n in Yesod
by Sven Koschnicke (GFXpro) 10 May '11

10 May '11

Hello, I just tested the I18n support in Yesod, looks very promising! Altough I noticed a small annoyance: There's often the case that you want to provide translations for the names of your models, i.e. Books. You will have a model named Book. When you then try to create a translation "Book" you get an ambiguous occurrence error. I'm sure it is possible to solve it by using namespaces but I'm just starting haskell so I'm not sure how to implement it, also I think the framework should handle this case. Sven

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Database.Persistent
by Jeremy Hughes 10 May '11

10 May '11

Hi all, Is Database.Persistent lazy wrt reading fields? I need to iterate over entities containing both small and large fields. I do not need to use the large fields in this instance, and so would rather they were not read from the database. Cheers, Jeremy -- enjoying exploring yesod

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Template Haskell intricacies with mkPersist
by Patrick Palka 09 May '11

09 May '11

Hey, I've attached a file that fails to compile, resulting in a "not in scope: getHomeR" error message. The culprit seems to be the mkPersist TH splice, which, when ocurring before the getHomeR view, causes it to not be seen by GHC when it parses the mkYesod splice. Moving the mkPersist splice to occur after the getHomeR view will alleviate this problem, but then one can't use the data constructors that mkPersist generates within the getHomeR view. Moving the mkPersist splice into a seperate module and importing that works perfectly fine, however. Can anyone clarify what is going on?

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I can't install yesod
by Александр Лазарев 09 May '11

09 May '11

Haskell Platform 2011.2.0.1, Win XP SP2. I've try install yesod by in cygwin window *cabal install yesod* but take $ cabal install yesod Resolving dependencies... cabal.exe: cannot configure tls-extra-0.2.2. It requires certificate >=0.8.1 && <0.9 For the dependency on certificate >=0.8.1 && <0.9 there are these packages: certificate-0.8.1. However none of them are available. certificate-0.8.1 was excluded because certificate-0.7.0 was selected instead certificate-0.8.1 was excluded because http-enumerator-0.6.4.1 requires certificate ==0.7.* The same result I take on ubuntu 10.10 with Haskell Platform 2010. What I can in this circumstancies

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when we switch to aeson, perhaps a QQ for JSON..
by Max Cantor 09 May '11

09 May '11

I know that the kickass yesod team is looking to change the json library to aeson. One nice feature would be quasi-quoting for the library like in the following library. hackage.haskell.org/packages/archive/text-json-qq/0.2.0/doc/html/Text-JSON-…

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Naming Yesod templates
by Greg Weber 09 May '11

09 May '11

Hi web-devel, Yesod has generalized hamlet-style templates a fair amount now so that hamlet-style interpolation can be quickly added to any file. With this in mind, we don't want to add a new Shakespearean name for every possible file format. The standard we would like to follow is that if we actually create a new format (hamlet or cassius), then we give it a special name. However, if the template is just a pass-through (Julius), then it does not deserve a new name. We have moved in this direction with coffeescript (pass-through), just referring to it as coffee. We would like to come up with a way to refer to hamlet-style templates. I have used the term "hamlet family of templates". Shakespeare is a somewhat natural fit. We would then call the Cofffeescript templates "Shakespeare Coffeescript". However, a more descriptive name might be nice. A short description of hamlet-style templates is: compile-time evaluated, type-safe (we insert specific types, not just string), convenient (automatically uses variables that are in scope), template languages. Any input on possible names is welcome! Also, just a heads up about that we are planning on making aeson a yesod-core dependency (please complain now if you take issue). This is because we want to move orphan ToJavascript instances will be moved into Julius/Coffee where they belong We can make Julius/Coffee a separate package so that hamlet does not have an aeson dependency, but this package will still be a core dependency, and thus will create an aeson dependency in yesod-core. Greg Weber

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