I'm trying to create a new field in my settings.yml file for my static file's locations (so I can change from a local subdirectory in development to a CDN in production), but I can't seem to get a basic "hello world" going. Here is my Settings.hs:
data Extra = Extra
{ extraCopyright :: Text
, extraAnalytics :: Maybe Text -- ^ Google Analytics
, extraStatic :: Text
} deriving Show
parseExtra :: DefaultEnv -> Object -> Parser Extra
parseExtra _ o = Extra
<$> o .: "copyright"
<*> o .:? "analytics"
<*> o .: "static"
And here is the relevent part of settings.yml:
Default: &defaults
host: "*4" # any IPv4 host
port: 3000
approot: "http://localhost:3000"
copyright: Insert copyright statement here
#analytics: UA-YOURCODE
static: "/static"
And lastly, the part that throws the error. I didn't really know how I should've gone about including it's value in a request, so I just threw the code in to be executed on each request:
getHomeR :: Handler Html
getHomeR = do
(formWidget, formEnctype) <- generateFormPost sampleForm
let submission = Nothing :: Maybe (FileInfo, Text)
handlerName = "getHomeR" :: Text
test = fmap extraStatic getExtra
defaultLayout $ do
aDomId <- newIdent
setTitle "Welcome To Yesod!"
$(widgetFile "homepage")
And I have the same line added on postHomeR aswell (test = fmap extraStatic getExtra). My hamlet:
<p>#{test}
And finally, the error thrown on the screen:
Handler/Home.hs:37:11:
No instance for (blaze-markup-0.5.1.5:Text.Blaze.ToMarkup
(HandlerT App IO Text))
arising from a use of `toHtml'
Possible fix:
add an instance declaration for
(blaze-markup-0.5.1.5:Text.Blaze.ToMarkup (HandlerT App IO Text))
In the first argument of `Yesod.Core.Widget.asWidgetT
. toWidget', namely
`toHtml test'
In a stmt of a 'do' block:
(Yesod.Core.Widget.asWidgetT . toWidget) (toHtml test)
In a stmt of a 'do' block:
do { (Yesod.Core.Widget.asWidgetT . toWidget)
((blaze-markup-0.5.1.5:Text.Blaze.Internal.preEscapedText
. Data.Text.pack)
"<h1>");
((Control.Monad.liftM (toHtml .) getMessageRender)
>>=
(\ urender_aaYh
-> (Yesod.Core.Widget.asWidgetT . toWidget)
(urender_aaYh MsgHello)));
(Yesod.Core.Widget.asWidgetT . toWidget)
((blaze-markup-0.5.1.5:Text.Blaze.Internal.preEscapedText
. Data.Text.pack)
"</h1>\
\<ol><li>Now that you have a working project you should use the <a href=\"http://www.yesodweb.com/book/\">Yesod book</a> to learn more. You can also use this scaffolded site to explore some basic concepts.</li><li> This page was generated by the ");
(Yesod.Core.Widget.asWidgetT . toWidget) (toHtml handlerName);
.... }
Build failure, pausing...
Is there any way I can cast it? Is there any way I can make the variable get assigned and loaded during app startup, but be accessible throughout the requests as a constant value? Any help would be greatly appreciated!!
The problem is:
let test = fmap extraStatic getExtra
getExtra
is a Handler
action, so what you want is:
test <- fmap extraStatic getExtra