[web-devel] Single step debugging a yesod application

[Nubis]

Thanks Alberto, not how I had in mind, but that helps a lot getting where I
need a lot faster.

cheers
----nubis

On Wed, Nov 3, 2010 at 12:06 PM, Alberto G. Corona <agocorona at gmail.com>wrote:

> Maybe you can break at " u <- get404 uid". Then you can execute
> :steplocal once to reach te line you desired.
>
> 2010/11/3 Nubis <nubis at woobiz.com.ar>:
> > Hi guys,
> > As I said in another thread, I've been debugging a yesod application
> single
> > stepping through one of the handlers. I'm using ghci built in debugger
> and
> > it's pretty good, but I always fail to set the breakpoint in the right
> scope
> > where I can evaluate the stuff I'm interested in learning more about.
> > For instance, in the following code I would like to set the debugger on
> the
> > line before "mv <- maybeAuth", in order to :force the values  of (uid,
> u).
> > But even when I set it at the beginnig of the 'mv' line, the scope ends
> up
> > being the entire do block. Which makes sense, but doesn't helpe me solve
> my
> > problem :)
> >
> > getUserR :: String -> Handler RepHtmlJson
> > getUserR input = do
> >     (uid, u) <-
> >         case readIntegral input of
> >             Just uid -> debugRunDB $ do
> >                 u <- get404 uid
> >                 mun <- getBy $ UniqueUsernameUser uid
> >                 case mun of
> >                     Nothing -> return (uid, u)
> >                     Just (_, Username _ un) ->
> >                         lift $ redirect RedirectPermanent $ UserR un
> >             Nothing -> debugRunDB $ do
> >                 mun <- getBy $ UniqueUsername input
> >                 case mun of
> >                     Nothing -> lift notFound
> >                     Just (_, Username uid _) -> do
> >                         u <- get404 uid
> >                         return (uid, u)
> >     mv <- maybeAuth
> >
> >
> > Maybe the problem is that I'm thinking in a too procedural fashion about
> do
> > blocks, or that evaluating those results is kind of paranoid. I'm too
> > spoiled by REPL's, I would even like to be able to use a REPL that runs
> > inside runDB for querying models and doing stuff with them interactively.
> >
> > How do you debug your yesod apps? am I drifting too far away from the
> > haskell way?
> >
> > thanks in advance for your comments :)
> >
> > cheers
> > ----nubis
> >
> > _______________________________________________
> > web-devel mailing list
> > web-devel at haskell.org
> > http://www.haskell.org/mailman/listinfo/web-devel
> >
> >
>
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