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From ivan at llaisdy.com Tue Oct 20 15:19:05 2015
From: ivan at llaisdy.com (Ivan Uemlianin)
Date: Tue, 20 Oct 2015 14:19:05 +0100
Subject: [99s-extend] Cowboy: Maps instead of records for context variables
Message-ID: <[email protected]>
Dear All
Would there be any reason against using a map instead of a record for
the context variable in a Cowboy REST resource?
Quite often I have a few resources doing very similar things in their
callbacks, and I'd like to abstract out the similarities into a module -
but I don't want to share a record between modules.
Maps seem to be a good fit, and I can't think of any downside
(performance hit should be tiny).
Can anyone give me reasons to stick with records?
With thanks and best wishes
Ivan
--
============================================================
Ivan A. Uemlianin PhD
Llaisdy
Speech Technology Research and Development
ivan at llaisdy.com
@llaisdy
llaisdy.wordpress.com
github.com/llaisdy
www.linkedin.com/in/ivanuemlianin
festina lente
============================================================
From essen at ninenines.eu Tue Oct 20 15:22:39 2015
From: essen at ninenines.eu (=?UTF-8?Q?Lo=c3=afc_Hoguin?=)
Date: Tue, 20 Oct 2015 15:22:39 +0200
Subject: [99s-extend] Cowboy: Maps instead of records for context
variables
In-Reply-To: <[email protected]>
References: <[email protected]>
Message-ID: <[email protected]>
On 10/20/2015 03:19 PM, Ivan Uemlianin wrote:
> Dear All
>
> Would there be any reason against using a map instead of a record for
> the context variable in a Cowboy REST resource?
>
> Quite often I have a few resources doing very similar things in their
> callbacks, and I'd like to abstract out the similarities into a module -
> but I don't want to share a record between modules.
>
> Maps seem to be a good fit, and I can't think of any downside
> (performance hit should be tiny).
>
> Can anyone give me reasons to stick with records?
The only reason to use records is to keep typespecs information to
improve Dialyzer's error reporting.
Personally I have no problems going with just maps for all kinds of
states, even if they are in the same module. This is partly because I
rely a lot more on tests than on Dialyzer to tell me my program is wrong.
Cheers,
--
Lo?c Hoguin
http://ninenines.eu
Author of The Erlanger Playbook,
A book about software development using Erlang
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