The problem is that admin-layout.hamlet embeds a Widget inside of it, making admin-layout.hamlet itself a Widget. However, you are using hamletToRepHtml, which expects a Hamlet. That's the type error. The final unwrapping of a Widget and conversion to a Hamlet *is* a bit tricky; the best place for an example of how to do it right is from the scaffolded site, in the implementation of defaultLayout. HTH, Michael On Fri, Jul 1, 2011 at 4:43 PM, Kamil Ciemniewski wrote:

Hi all,

I'm trying to add to my "admin layout" main menu in Yesod.

Normally - doing it in Rails - I would create a partial or helper and then use it in my layout file.

But here in Yesod - the concept of widgets seems somewhat fereign to me. I don't quite get them.

In my Handler.Admin module I define:

adminLayout :: GWidget MyApp MyApp () -> GHandler MyApp MyApp RepHtml adminLayout widget = do         mmsg <- getMessage     mroute <- getCurrentRoute     pc <- widgetToPageContent $ do         widget     hamletToRepHtml $(hamletFile "admin/admin-layout")

then I define my widget ( all in the same file ):

mainMenu :: Widget () mainMenu =   addWidget $(widgetFile "admin/_menu")

And finally in "admin/admin-layout.hamlet" I'm trying to render my menu:

... ^{mainMenu} ...

All without a luck.. Compiler yells at me strange ( to me ) things:

Handler/Admin.hs:31:27:     Couldn't match expected type `GGWidget                                     MyApp (GHandler MyApp MyApp) ()'                 with actual type `(url0 -> [(T.Text, T.Text)] -> T.Text)                                   -> blaze-html-0.4.1.1:Text.Blaze.Internal.Html'     Expected type: Widget ()       Actual type: hamlet-0.8.1:Text.Hamlet.Quasi.Hamlet url0     In the return type of a call of `pageBody'     In the first argument of `hamlet-0.8.1:Text.Hamlet.Quasi.fromHamletValue', namely       `pageBody pc'

Which doesn't occur when I'm not trying to render "mainMenu" widget.

What am I doing wrong? And are there any informations about using widgets anywhere? ( because I haven't found many.. )?

Best regards Kamil Ciemniewski

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