django: use postgresql unix sockets

examples/python-django/devenv.nix

@@ -2,8 +2,6 @@
 
 let
   db_user = "postgres";
-  db_host = "localhost";
-  db_port = "5432";
   db_name = "db";
 in
 {
@@ -13,25 +11,28 @@ in
     poetry.enable = true;
   };
 
+  # To load secrets like SECRET_KEY from .env
+  # dotenv.enable = true;
+
   env = {
-    DATABASE_URL = "postgres://${db_user}@/${db_name}?host=${config.env.PGHOST}";
+    DATABASE_URL = "postgres://${db_user}@${config.env.PGHOST}/${db_name}";
     DEBUG = true;
-    SECRET_KEY = "123";
-    STATIC_ROOT = "/tmp";
+    SECRET_KEY = "supersecret";
+    STATIC_ROOT = config.devenv.state + "/static";
   };
 
   services.postgres = {
     enable = true;
     initialScript = "CREATE USER ${db_user} SUPERUSER;";
     initialDatabases = [{ name = db_name; }];
-    listen_addresses = db_host;
   };
 
-  processes.runserver.exec = "python manage.py runserver";
-  processes.runserver.process-compose.depends_on.postgres.condition = "process_ready";
+  processes.runserver = {
+    exec = "python manage.py runserver";
+    process-compose.depends_on.postgres.condition = "process_ready";
+  };
 
   enterTest = ''
-    wait_for_port ${db_port}
     python manage.py test
   '';
 }