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Extending Configs

Β Example (Click Here)

A common pattern is to extend an existing config, overriding and/or adding new config values to it. The extension is done by including the base configuration, and then overriding the chosen values in the current config.

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This page assumes that you are familiar with the contents of The Defaults List.

Extending a config from the same config group:​

config.yaml
defaults:
- db: mysql





db/mysql.yaml
defaults:
- base_mysql

user: omry
password: secret
port: 3307
encoding: utf8
db/base_mysql.yaml
host: localhost
port: 3306
user: ???
password: ???



Output:

$ python my_app.py
db:
host: localhost # from db/base_mysql
port: 3307 # overridden by db/mysql.yaml
user: omry # populated by db/mysql.yaml
password: secret # populated by db/mysql.yaml
encoding: utf8 # added by db/mysql.yaml

Extending a config from another config group:​

To extend a config from a different config group, include it using an absolute path (/), and override the package to _here_. (_here_ is described in Packages)

db/mysql.yaml
defaults:
- /db_schema/base_mysql@_here_

It is otherwise identical to extending a config within the same config group.