[SOLVED] Introductory example on serving data from sqlite database via REST API with the yesod web frame work in haskell

Introductory example on serving data from sqlite database via REST API with the yesod web frame work in haskell

I want a "keep it simple and stupid" (i.e., "make it as simple as possible but not simpler") way of serving data that is stored in a sqlite data base. In haskell I want to use the ysod web framework. Actually, as I am only severing data, I need to implement simply GET requests.

I am not interested in generating html, css, javascript, session management, user management, web blog applications, authentication, etc.

The last two hours I read several webpages from the Ysod Book and tutorials on fpcomplete. Up til now I could not get an example running.

Finally I tried to get an example from a blog post running . Although the example is not too old and from 2013, yesod changed a lot since then and it is not obvious on how to get the example running.

I adapted the following lines in the blog post example. Missing language extensions:

{-# LANGUAGE ViewPatterns               #-}
{-# LANGUAGE ScopedTypeVariables        #-}

Further persist is no longer available, thus persistLowerCase:

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Stuff
    value Text
    ValueName value value
    deriving Show
|]

Still, there are probably a bunch of fixes needed to get the example running.

So prior to investing more time my question is: where do I find a up to date example or tutorial on how to use ysod with sqlite to program a REST API serving JSON data?

Solution