Why not just use `Application.get_env(app_name, var_name) ||
System.get_env(var_name)` in your init callback? Seems much clearer to me
and requires no additions to get_env.
On Sat, 17 Dec 2016 at 09:17 José Valim <jose.va...@plataformatec.com.br>
wrote:
> There has been a couple discussions on the topic either here or on the
> issues tracker.
>
> The consensus is that this problem needs to be solved but we are not quite
> sure how. The only way to support {:system, "DATABASE_URL"} in a way that
> it would also work for Erlang applications is by hijacking the application
> controller using private APIs. We could also try solve this exclusively for
> Elixir but then there would be gaps where it wouldn't be supported.
>
> Ecto 2.1 is trying a new approach where the value is configured using a
> repository callback, that's what we will try to do when Phoenix 1.3 comes
> out and see where it will lead us to.
>
>
>
> *José Valim*
> www.plataformatec.com.br
> Skype: jv.ptec
> Founder and Director of R&D
>
> On Sat, Dec 17, 2016 at 1:48 AM, Cory ODaniel <c...@coryodaniel.com>
> wrote:
>
> I've definitely run into issues where I need to pass an environment
> variable at run time, but an application that I use doesn't support the
> {:system, "DATABASE_URL"} or {:system, "PORT"} style environment variables
> that Ecto and Phoenix support.
>
> I'm curious if it would be beneficial to add support in
> Application.get_env/2 that when the value that returns matches {:system,
> var} then System.get_env(var) would be called under the hood.
>
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