Dancer2: config UTF8 for JSON serializer from code

[TheTailgunner]

Hi all. I have a simple web-app with Dancer2, separated for two apps:

MyApp->to_app;
builder {
    enable 'Deflater';
    mount '/' => MyApp->to_app;
    mount '/json' => MyApp::Controller->to_app;
}

one for serving content (pages etc) and one for handling JSON API;

When im trying to set up serializer engine from config.yml, like this:

serializer: "JSON"
engines:
   serializer:
       JSON:
           pretty: 1
           allow_blessed: 1
           canonical: 0
           utf8: 1

app serving pages ceases to work (probably, because it tries to use JSON-serializer).

All works with

set serializer => 'JSON';

in my controller app, but this way i lost ability to customize serialization settings (at least because i dont understand how). With your permission, I will not show examples of attempts to you - they are uncomplicated and uneffective. How can i customize config setting from code (or not from code) for my second app?

With best regards, Vlad.

[1nickt]

Hi Vlad, you can customize the serializer in the application package by setting the engine config first, then the serializer option:

# in MyApp::Controller
use Dancer2;

set engines => {
    serializer => {
        JSON => {
                pretty        => 1,
                allow_blessed => 1,
                canonical     => 0,
                utf8          => 1,
        },
    },
};
set serializer => 'JSON';

get '/config' => sub {
    return config;
};

Output in browser when requesting /config is something like:

{
   "apphandler" : "PSGI",

   # bunch of stuff snipped ...

   "engines" : {
      "serializer" : {
         "JSON" : {
            "utf8" : 1,
            "canonical" : 0,
            "allow_blessed" : 1,
            "pretty" : 1
         }
      }
   },
   "serializer" : null,
   "static_handler" : 1,
   "host" : "0.0.0.0"
}

Note that, oddly, the config shows the value of serializer as null, but as the format of the output shows, the settings are being implemented.

Hope this helps!