[web-devel] widgets vs hamlet was Re: on the necessity of extractBody

4 May 2011

      oops, forgot to reply to all
----------------------------

addWidget doesn't work.  when I replace addHamlet with addWidget and ^{form} with ^{formW} I get the errors below.  Its not that I'm that bothered by having to write extractBody, but since you say I dont have to I feel like this means I'm doing something.  Again, I feel like I can get widgets and hamlet and html to work, but I feel like I'm hacking it and dont really understand whats going on.  

when you say polymorphic hamlet is going away, what will replace it?  everything is a widget then?

S4M/Server/Handler/Admin.hs:49:11:
   No instance for (Eq (Route master0))
     arising from a use of `widgetToPageContent'
   Possible fix: add an instance declaration for (Eq (Route master0))
   In the expression: widgetToPageContent
   In a stmt of a 'do' expression:
       pc <- widgetToPageContent
           $ do { addWidget ($(Settings.hamletFile "admin/purch-dtl")) }
   In a stmt of a 'do' expression:
       (_, formW, et, nonce) <- runFormPost (purchFormlet purch ocrRefs)

S4M/Server/Handler/Admin.hs:51:19:
   The lambda expression `\ render[aCFb]
                            -> hamlet-0.8.0:Text.Hamlet.Debug.unsafeRenderTemplate
                                 "hamlet/admin/purch-dtl.hamlet" ... render[aCFb]'
   has one argument,
   but its type `GGWidget master0 (GHandler sub0 master0) ()' has none
   In the expression:
     \ render[aCFb]
       -> hamlet-0.8.0:Text.Hamlet.Debug.unsafeRenderTemplate
            "hamlet/admin/purch-dtl.hamlet"
            [(["mPsiPkv"], 
              Text.Hamlet.RT.HDMaybe (fmap (\ _var[aCFc] -> ...) mPsiPkv)),
             (["act"], Text.Hamlet.RT.HDUrl act), ....]
            render[aCFb]
   In the result of the splice:
     $(Settings.hamletFile "admin/purch-dtl")
   To see what the splice expanded to, use -ddump-splices
   In the first argument of `addWidget', namely
     `$(Settings.hamletFile "admin/purch-dtl")'

S4M/Server/Handler/Admin.hs:51:19:
   The lambda expression `\ render[aCKe]
                            -> hamlet-0.8.0:Text.Hamlet.Debug.unsafeRenderTemplate
                                 "hamlet/admin/purch-dtl.hamlet" ... render[aCKe]'
   has one argument,
   but its type `GGWidget master0 (GHandler sub0 master0) ()' has none
   In the expression:
     \ render[aCKe]
       -> hamlet-0.8.0:Text.Hamlet.Debug.unsafeRenderTemplate
            "hamlet/admin/purch-dtl.hamlet"
            [(["mPsiPkv"], 
              Text.Hamlet.RT.HDMaybe (fmap (\ _var[aCKf] -> ...) mPsiPkv)),
             (["act"], Text.Hamlet.RT.HDUrl act), ....]
            render[aCKe]
   In the result of the splice:
     $(Settings.hamletFile "admin/purch-dtl")
   To see what the splice expanded to, use -ddump-splices
   In the first argument of `addWidget', namely
     `$(Settings.hamletFile "admin/purch-dtl")'

On May 4, 2011, at 1:15 PM, Michael Snoyman wrote:
...
Firstly, polymorphic Hamlet is going the way of the do-do. (Sorry
everyone, the train ride worked out differently than expected, so the
blog post explaining this isn't ready yet.) So going forward these
things should be less of a problem.
I think the reason you're running into trouble is the use of
"addHamlet"; try replacing it with "addWidget" and see what happens.
On Tue, May 3, 2011 at 4:33 PM, Max Cantor  wrote:
...
I've heard that its unnecessary, but I can't seem to get out it of my code.  for instance, here is a simple route which should return a small HTML snippet for AJAX requests:
getAdmPurchDetailRh   :: EncPurchId -> Handler RepHtml
getAdmPurchDetailRh epid = withEncPersistKey epid $ \(purchId, purch) -> do
  -- purchImgData <- runDB $ selectList [] [] 50 offset
  -- _TODO this will be done FOR EACH Purchase.  need to cache the OcrRefs
  ocrRefs <- map snd <$> runDB ( selectList [] [] 50 0)
  mPsiPkv <- runDB (getBy $ PurchImgUnq purchId True)
  (_, formW, et, nonce) <- runFormPost (purchFormlet purch ocrRefs)
  let act = AdminRb
  pc <- widgetToPageContent $ do
    form <- extractBody formW
    addHamlet $(Settings.hamletFile "admin/purch-dtl")
  hamletToRepHtml [$hamlet|\^{pageBody pc}|]
and the hamlet file:
<div>
$maybe psiPkv <- mPsiPkv

$nothing

    missing image
<form action=@{act} enctype=#{et}>
  #{nonce}
  ^{form}
  <input type=submit>
if I drop the extractBody formW call and replace ^{form} with ^{formW} it fails to compile.
also, is there a way to get rid of the widgetToPageContent call and then extracting it with pageBody pc?  hamletToRepHtml fails when the hamlet references any widgets it seems.
sidenote, i understand that there is alot of polymorphism going on here but I'm still not exactly clear on what i "should" be doing in terms of hamlet, widgets, snippets etc.  any style hints are appreciated.
max
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