[Haskell-cafe] help with some code
gbwey9 at gmail.com
Sat Jul 12 03:52:49 UTC 2014
I'll take a look into it. Thanks for the help!
On Fri, Jul 11, 2014 at 11:39 PM, Erik Rantapaa <erantapaa at gmail.com> wrote:
> On Friday, July 11, 2014 10:01:38 AM UTC-5, gbwey9 wrote:
>> Hi Cafe,
>> I've got some code where a user can provide a filter to subscribe to a
>> particular type of event. The events come in as xml and are parsed using
>> the toEvent method.
>> The code works fine but is repetitive since each event record potentially
>> has the information needed to parse the xml using the field names and
>> So is there a way to get rid of the repetition and streamline the code?
>> Should I be using TH or lenses or something else entirely?
>> Here is the paste.
>> Thanks for any pointers!
> Regarding how the defining the toEvent instances can be simplified, have a
> look at the FromJSON type class works in the aeson package. One technique
> they use is to define FromJSON instances for even the primitive types (e.g.
> Int, String, DateTime, etc.) so that the FromJSON instances of records can
> be entirely type-directed removing the need to reference specific
> deserialization functions (e.g. getint, getbool, etc.)
> One example of a package which uses aeson (of which there are many) is the
> github package:
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