Re: [Haskell-cafe] Subject: A universal data store interface

Hi Deian, Thanks for bringing this to our attention - this is a neat project! It actually looks *exactly* like persistent - I can't actually discern a meaningful difference, although likely your internals are slightly simpler if you only support MongoDB. If your goals are to support multiple backends then it seems your goals are *exactly* the same as Persistent. Lets collaborate on this off of the mail list. The url listed on hackage for the git repo points to Stanford, not github. Greg Weber On Tue, Feb 14, 2012 at 11:17 AM, Deian Stefan wrote:

On Mon, Feb 13, 2012 at 11:52, Greg Weber wrote:

...

That being said, I would like to have a Template Haskell interface instead of just a QQ interface. The reason why we haven't bothered with doing that ourselves is because the record name-spacing issue makes the current QQ interface much more convenient. I am actively working to solve the namespace issue. This all brings up a great point though: as part of the GSoC we should create a Template Haskell interface (similar to acid-state as you mention). Given the structure of things that Michael has already pointed out, and that we are already using Template Haskell with the DSL, this should only be a few day's work.

I'm joining this thread slightly late, but thought I point to a similar TH approach:

http://hackage.haskell.org/package/structured-mongoDB

The implementation is very much MongoDB-specific, but we're working on targeting different backends (package is on github, so we welcome other hackers).  Of course, some of the issues that have been brought up (e.g., no support for projection) still exist in structured-mongoDB, but our goals have been more relaxed: 1) provide a type-safe interface to MongoDB, 2) to avoid QQ DSL approach if possible, and 3) support a HaskellDB-like query interface.