I have no idea what Yesod is, but I know exactly what each of your other errors means. First, you should not try to link statically. The warning you get is exactly right: if you link statically, and use one of the routines for which you are getting the warning, then you must arrange to … Read more
Something worth noting is that SQLite has issues with locking when stored on NFS-like volumes (vboxsf, NFS, SMB, mvfs, etc.) on many systems which cause SQLite to give that error even before you’ve successfully opened the database. These volumes may implement fcntl() read/write locks incorrectly. ( http://www.sqlite.org/faq.html#q5 ) Assuming that’s not the issue, it’s also … Read more
Even if the answer can already be found in the comments, I would like to give a complete example. Assuming we have a Person Model, the following function returns a record for the persion with the given ID (if it exists): import Database.Persist.Types (PersistValue(PersistInt64)) getByIntId :: Integral i => i -> Handler (Maybe Person) getByIntId … Read more
Apologies if my answer is a tad vague (it’s been a few months since I’ve used Yesod, and the dev cycle is quite rapid), but if I remember correctly you can specify multiple varieties of authentication within the YesodAuth class (browserID, google etc), in which case the user would be provided with the option as … Read more
In the time since this question was posted, esqueleto has gone through a number of major revisions. As of version 2.1.2, and several earlier versions, the QueryType a parameter that necessitated your unsafeCoerce has been removed from toRawSql; that major wart is no longer necessary. As currently implemented, a Connection is required. I believe that, … Read more
Philosophically speaking, in the Haskell/Yesod world you want to pass the values forward, rather than return them backwards. So instead of having the handlers return a value, have them call forwards to the next step in the process, which may be to generate an exception. Remember that you can bundle any amount of future actions … Read more
Full disclosure: I’m one of the lead developers of Snap. First of all, let’s talk about what Snap is. Right now the Snap team maintains five different projects on hackage: snap-core, snap-server, heist, snap, and xmlhtml. snap-server is a web server that exposes the API defined by snap-core. heist is a templating system. xmlhtml is … Read more