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Questions tagged [yesod]

Yesod is a Haskell web framework for productive development of type-safe, RESTful, high performance web applications.

Yesod is a Haskell web framework for productive development of type-safe, RESTful, high performance web applications.

Yesod leverages Haskell's type system to turn runtime bugs into compule-time errors, for example to avoid XSS attacks or character encoding issues. Yesod contains several DSLs for templating ( for HTML, for Javascript, and or for CSS), to store data (Persistent), for routing, etc.

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yesod - getting the request body for a POST "Content-type: application/json"

Using yesod 0.8.0, I'm trying to retrieve the body of a post message from this example request: curl -v -H "Accept: application/json" -H "Content-Type: application/json" -X POST -d '{"name":"oscar"}' http://localhost:3000/user/xyz in my handler…
Oscar
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How to build an AngularJS app with Yesod

I managed to successfully write a small app using Yesod. Now I am in the phase in which I want to add better interaction to it, and I would like to do this using AngularJS. As far as I can see, the support for AngularJS in Yesod is still…
Damian Nadales
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Allowing cross-origin requests in Yesod

My application uses a bookmarklet, and I need to allow CORS for MyRouteR so my bookmarklet code can use this route for AJAX requests. In my first draft of config/routes I gave MyRouteR support for only one request method, PUT. But it turned out…
Christian Brink
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Does yesod uses the processor when idle?

I have created a very simple application using yesod. It's not very used, but when I check with htop, it has consumed more cpu time than all other processes in the server, including processes that are running for a much bigger time. Also, when I…
marcot
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cabal install ... failing - osx - many unsatisfied packages

Update: Running ghc-pkg check reported: ~: ghc-pkg check WARNING: cache is out of date: /Library/Frameworks/GHC.framework/Versions/7.0.3i386/usr/lib/ghc-7.0.3/package.conf.d/package.cache use 'ghc-pkg recache' to fix. ~: ghc-pkg recache and after…
ErikR
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I don't understand what this type family stuff in yesod is for

I went through yesod book and the source and learned pretty much how everything works. But before I write my own stuff, there is one thing in the scaffolded site that I just don't understand. So I scaffold a site "copywww" and in the file…
David McHealy
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Representing sum types in sql with Persistent, and Esqueleto joins

I have been trying to figure out a sensible way to represent Haskell sum types in a SQL backend using persistent. My target Haskell data type is along the lines of data Widget = FooWidget Int | BarWidget T.Text data HElement = HElement { name …
Michael Thomas
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Is there a way to kill all forked threads in a GHCi session without restarting it?

Based on my previous question I'd like to ask if there's any way to kill all user created threads in a GHCi session? The reason for this is that when a function exits in GHCi the threads that it spawned don't terminate automatically, persisting even…
Jakub Arnold
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How do I define a composite key in Persistent

How do I declare to Persistent that I have a table the primary key of which is a combination of two fields? For example, assume I have a table containing first_name and last_name, then in SQL syntax I'll need something like: CONSTRAINT pk_PersonID…
Uri Barenholz
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What is the comment syntax in Yesod (hamlet) templates?

I just can not find how to comment line in hamlet template. Is there some syntax for comments? Like --

Some code should be ignored by template or something?

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Composing Database.Esqueleto queries, conditional joins and counting

How can I compose Database.Esqueleto queries in a modular way such that after defining a "base" query and the corresponding result set, I can restrict the result set by adding additional inner joins and where expressions. Also, how can I convert the…
Tero
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Example of persistent with backend-specific operator

I would like to do a LIKE query in persistent, I'm using sqlite. The yesod book gives an example of using raw SQL to do it, but says: you can express a LIKE operator directly in the normal syntax due to a feature added in Persistent 0.6, which…
JP Moresmau
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Efficient large file upload with Yesod

I want to implement large file upload with my Yesod application. Right now I have: module Handler.File where import Import import System.Random import System.FilePath import Control.Monad import qualified Data.ByteString.Lazy as LBS import…
Tener
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How to use UTCTime in yesod without hidden module errors?

I'm creating a simple website using yesod. It was working until I added a field of type UTCTime to my database model. I initially got an error suggesting I add "time-1.2.0.3" to my cabal file, so I did and now I get much the same error without the…
arx
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Link to a static file from Hamlet

I'm currently experimenting with Yesod by following the tutorial on the Yesod Wiki. First I created a yesod application using yesod init, and created a Root handler that renders a widget file called homepage: getRootR = do mu <-…
Antoine
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