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

Tom Murphy amindfv at gmail.com
Mon Feb 13 20:40:10 CET 2012

It seems that all tutorials and resources for Persistent use Template
Haskell along with several Yesod specifics.

But, I could be wrong, or new tutorials could be written.


On 2/13/12, Michael Snoyman <michael at snoyman.com> wrote:
> Actually, Persistent is fully usable without any special syntax, DSLs,
> or Template Haskell. In fact, Persistent itself has no
> template-haskell dependencies, specifically so that it can be built on
> ghc-iphone. Additionally, the Persistent DSL syntax is completely
> separate from any other Yesod DSL syntaxes that exist, so it's not
> like you have to learn five new things to get the automatic code
> generation.
> On Mon, Feb 13, 2012 at 9:30 PM, Tom Murphy <amindfv at gmail.com> wrote:
>>     With respect, I don't think that Persistent is a natural choice
>> as the go-to tool for Haskell users, simply because it requires
>> knowledge of a lot of Yesod-EDSL syntax.
>>     The set of users with persistent data needs seems a very
>> different set than that of those who are familiar with Yesod, and I
>> think the syntax is quite confusing without fuller understanding of
>> Yesod.
>>     The syntax of acid-state (not familiar with this one), and
>> swapper (https://github.com/roman-smrz/swapper/blob/master/test/) seem
>> to have a much more linear learning curve for an intermediate Haskell
>> user.
>> amindfv / Tom
>> On 2/13/12, Greg Weber <greg at gregweber.info> wrote:
>>> Hi Sergiu,
>>> Thanks you for your interest in that proposal. I rushed it off a year
>>> ago. Since then we have made a lot of improvements to Persistent and
>>> the library forms a basic building block for most Yesod users and
>>> other Haskellers. Persistent offers a level of type-safety and
>>> convenience not available elsewhere (except perhaps for libraries like
>>> acid-state that are limited to in-memory storage). That being said,
>>> there are still a lot of improvements that could be made. With the
>>> effort of a GSoC volunteer we could probably get it to the point of
>>> being the go-to data storage library for Haskellers, at least those
>>> planning on using the subset of backends (likely SQL) with great
>>> support. This proposal is vague and we would need to work with you to
>>> narrow things down a bit.
>>> I am biased, but I believe the Yesod project is one of the most
>>> compelling in the Haskell ecosystem. There are a lot of different ways
>>> a GSoC project could help make things even better besides improving
>>> the associated Persistent library, and we would really like to mentor
>>> at least one GSoC student. I would open more tickets for this in the
>>> system, but I am not sure how helpful it will be. It seems that we
>>> need to reach out to more students like yourself, but I am not sure
>>> how to do that unless I see messages like these first.
>>> Greg Weber
>>> _______________________________________________
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>>> Haskell-Cafe at haskell.org
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