Merge branch 'release/4.22.0' into master

Author: rmk135

docs/containers/check_dependencies.rst

@@ -0,0 +1,18 @@
+.. _check-container-dependencies:
+
+Check container dependencies
+----------------------------
+
+To check container dependencies use method ``.check_dependencies()``.
+
+.. literalinclude:: ../../examples/containers/check_dependencies.py
+   :language: python
+   :lines: 3-
+   :emphasize-lines: 12
+
+Method ``.check_dependencies()`` raises an error if container has any undefined dependencies.
+If all dependencies are provided or have defaults, no error is raised.
+
+See also: :ref:`dependency-provider`.
+
+.. disqus::

docs/containers/index.rst

@@ -24,4 +24,5 @@ Containers module API docs - :py:mod:`dependency_injector.containers`.
     specialization
     overriding
     reset_singletons
+    check_dependencies
     traversal

docs/containers/reset_singletons.rst

@@ -1,3 +1,5 @@
+.. _reset-container-singletons:
+
 Reset container singletons
 --------------------------
 
@@ -16,4 +18,6 @@ Method ``.reset_singletons()`` also resets singletons in sub-containers: ``provi
    :lines: 3-
    :emphasize-lines: 21
 
+See also: :ref:`singleton-provider`.
+
 .. disqus::

docs/main/changelog.rst

@@ -7,6 +7,16 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+4.22.0
+------
+- Add method ``container.check_dependencies()`` to check if all container dependencies
+  are defined.
+  See issue: `#383 <https://github.com/ets-labs/python-dependency-injector/issues/383>`_.
+  Thanks to `@shaunc <https://github.com/shaunc>`_ for suggesting the feature.
+- Add container name to the representation of the ``Dependency`` provider.
+- Add docs cross-links between ``Singleton`` provider and "Reset container singletons"
+  pages.
+
 4.21.0
 ------
 - Improve ``Dependency`` provider error message: when dependency is undefined,

docs/providers/dependency.rst

@@ -1,3 +1,5 @@
+.. _dependency-provider:
+
 Dependency provider
 ===================
 
@@ -31,4 +33,6 @@ dependency provider will wrap it into the ``Object`` provider.
    :lines: 16-23
    :emphasize-lines: 3
 
+See also: :ref:`check-container-dependencies`.
+
 .. disqus::

docs/providers/singleton.rst

@@ -1,3 +1,5 @@
+.. _singleton-provider:
+
 Singleton provider
 ==================
 
@@ -62,6 +64,8 @@ call ``.full_reset()`` method.
    :lines: 3-
    :emphasize-lines: 25
 
+See also: :ref:`reset-container-singletons`.
+
 Using singleton with multiple threads
 -------------------------------------
 

examples/containers/check_dependencies.py

@@ -0,0 +1,15 @@
+"""Container dependencies check example."""
+
+from dependency_injector import containers, providers
+
+
+class Container(containers.DeclarativeContainer):
+
+    service1 = providers.Dependency()
+    service2 = providers.Dependency()
+
+
+if __name__ == '__main__':
+    container = Container()
+    container.check_dependencies()  # <-- raises error:
+    # Container has undefined dependencies: "Container.service1", "Container.service2"

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.21.0'
+__version__ = '4.22.0'
 """Version number.
 
 :type: str