462 Config.from_value() (#465)

* Implement .from_value() method for config provider

* Add tests for config.from_value() method

* Add example for config.from_value()

* Add docs

* Update changelog

Author: rmk135

docs/main/changelog.rst

@@ -13,6 +13,10 @@ Development version
   configuration files with ``${ENV_NAME:default}`` format.
   See issue `#459 <https://github.com/ets-labs/python-dependency-injector/issues/459>`_.
   Thanks to `Maksym Shemet @hbmshemet <https://github.com/hbmshemet>`_ for suggesting the feature.
+- Add method ``Configuration.from_value()``.
+  See issue `#462 <https://github.com/ets-labs/python-dependency-injector/issues/462>`_.
+  Thanks to Mr. `Slack Clone <https://disqus.com/by/slackclone/>`_  for bringing it up
+  in the comments for configuration provider docs.
 
 4.32.3
 ------

docs/providers/configuration.rst

@@ -164,6 +164,17 @@ Loading from an environment variable
    :lines: 3-
    :emphasize-lines: 18-20
 
+Loading a value
+---------------
+
+``Configuration`` provider can load configuration value using the
+:py:meth:`Configuration.from_value` method:
+
+.. literalinclude:: ../../examples/providers/configuration/configuration_value.py
+   :language: python
+   :lines: 3-
+   :emphasize-lines: 14-15
+
 Loading from the multiple sources
 ---------------------------------
 

examples/providers/configuration/configuration_value.py

@@ -0,0 +1,24 @@
+"""`Configuration` provider values loading example."""
+
+from datetime import date
+
+from dependency_injector import containers, providers
+
+
+class Container(containers.DeclarativeContainer):
+
+    config = providers.Configuration()
+
+
+if __name__ == '__main__':
+    container = Container()
+
+    container.config.option1.from_value(date(2021, 6, 13))
+    container.config.option2.from_value(date(2021, 6, 14))
+
+    assert container.config() == {
+        'option1': date(2021, 6, 13),
+        'option2': date(2021, 6, 14),
+    }
+    assert container.config.option1() == date(2021, 6, 13)
+    assert container.config.option2() == date(2021, 6, 14)