Any insights on generating a config.exs programmatically?

[Narcissus Emi]

Hi,

I'm now running a project which needs to generate config file based on user configurable key/value pair, I would like to create a user.exs(imported from config.exs) to before recompile and deploy the file all programmatically,currently I'm stucked at creating this exs file part.

Since a exs is just a valid keyword list, I think maybe using IO.inspect(keywords) and write to a file is already enough? Or is there any libs or methods we can do it more elegantly?

Hope anybody came across similar problem before, any help would be real appreciate :)

[OvermindDL1]

Large variety of ways of taking this.  Where are the key/values coming from and why can they not be put in a normal configuration file first?

[Narcissus Emi]

most config items are from db, so is hard to generate from normal configuration, and they might change the way how code is being generated as well.

I went back to use import_config in together with a mix task to create a config file by using Macro.to_string(quote bind_quotes: [value: value] do

use Mix.Config

config app,

key: value

end) before doing exrm release.

在 2016年8月1日星期一 UTC+8下午10:01:28，OvermindDL1写道：

[OvermindDL1]

Technically the Mix.Config files are full code, you could access the database within them and use values you get from there (I actually do a few things kind of like that for certain environment things that I cannot get from the environment).

[Narcissus Emi]

Yeps, that works, but I need something work like this.

mix generate_config name(so I can generate a config before compiling start to update the current config)

MIX_ENV=prod mix compile && MIX_ENV=prod mix release

scp rel/target.tar.bz2 server/name

if I do use db access in Config, I have no idea how argument can be sent into,so I end up with Macro which works good and easier to log with.

在 2016年8月1日星期一 UTC+8下午11:27:42，OvermindDL1写道：

[Michał Muskała]

You could take a look at how phoenix.new works. It creates config.exs with some initial values. This should be a good starting point.

Michał.

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[Onorio Catenacci]

That's a great suggestion @Michał!