Update Factory provider docs and examples

This commit is contained in:
Roman Mogilatov 2015-11-21 23:59:36 +02:00
parent 556c842685
commit 7eed1cf880
16 changed files with 105 additions and 89 deletions

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@ -16,6 +16,8 @@ Also, for both of these and some other cases, it might be useful to attach
some init / shutdown functionality or something else, that deals with group
of providers.
Catalogs module API docs - :py:mod:`dependency_injector.catalogs`.
.. toctree::
:maxdepth: 2

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@ -1,7 +1,10 @@
Factory providers
-----------------
``di.Factory`` provider creates new instance of specified class on every call.
.. module:: dependency_injector.providers
:py:class:`Factory` provider creates new instance of specified class on every
call.
Nothing could be better than brief example:
@ -15,21 +18,22 @@ Nothing could be better than brief example:
Factory providers and __init__ injections
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
``di.Factory`` takes a various number of positional and keyword arguments that
are used as ``__init__()`` injections. Every time, when ``di.Factory``
creates new one instance, positional and keyword argument injections would be
passed as an instance's arguments.
:py:class:`Factory` takes a various number of positional and keyword arguments
that are used as ``__init__()`` injections. Every time, when
:py:class:`Factory` creates new one instance, positional and keyword
argument injections would be passed as an instance's arguments.
Such behaviour is very similar to the standard Python ``functools.partial``
object, except of one thing: all injectable values are provided
*"as is"*, except of providers (subclasses of ``di.Provider``). Providers
*"as is"*, except of providers (subclasses of :py:class:`Provider`). Providers
will be called every time, when injection needs to be done. For example,
if injectable value of injection is a ``di.Factory``, it will provide new one
instance (as a result of its call) every time, when injection needs to be done.
if injectable value of injection is a :py:class:`Factory`, it will provide
new one instance (as a result of its call) every time, when injection needs
to be done.
Example below is a little bit more complicated. It shows how to create
``di.Factory`` of particular class with ``__init__()`` argument injections
which injectable values are also provided by another factories:
:py:class:`Factory` of particular class with ``__init__()`` argument
injections which injectable values are also provided by another factories:
.. note::
@ -58,14 +62,14 @@ Example of usage keyword argument injections:
Factory providers and __init__ injections priority
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Next example shows how ``di.Factory`` provider deals with positional and
keyword ``__init__()`` context arguments. In few words, ``di.Factory``
Next example shows how :py:class:`Factory` provider deals with positional and
keyword ``__init__()`` context arguments. In few words, :py:class:`Factory`
behaviour here is very like a standard Python ``functools.partial``:
- Positional context arguments will be appended after ``di.Factory``
- Positional context arguments will be appended after :py:class:`Factory`
positional injections.
- Keyword context arguments have priority on ``di.Factory`` keyword injections
and will be merged over them.
- Keyword context arguments have priority on :py:class:`Factory` keyword
injections and will be merged over them.
So, please, follow the example below:
@ -82,34 +86,38 @@ Objects can take dependencies in different forms (some objects take init
arguments, other use attributes setting or method calls). It affects how
such objects are created and initialized.
``di.Factory`` provider takes various number of positional and keyword
:py:class:`Factory` provider takes various number of positional and keyword
arguments, that define what kinds of dependency injections have to be used.
All of those instructions are defined in ``di.injections`` module and are
subclasses of ``di.injections.Injection`` (shortcut ``di.Injection``). There
are several types of injections that are used by ``di.Factory`` provider:
All of those instructions are defined in
:py:mod:`dependency_injector.injections` module and are subclasses of
:py:class:`dependency_injector.injections.Injection`. There are several types
of injections that are used by :py:class:`Factory` provider:
+ ``di.Arg`` - injection is done by passing injectable value in object's
``__init__()`` method in time of object's creation as positional argument.
Takes injectable value only.
+ ``di.KwArg`` - injection is done by passing injectable value in object's
``__init__()`` method in time of object's creation as keyword argument.
Takes keyword name of ``__init__()`` argument and injectable value.
+ ``di.Attribute`` - injection is done by setting specified attribute with
injectable value right after object's creation. Takes attribute's name
and injectable value.
+ ``di.Method`` - injection is done by calling of specified method with
injectable value right after object's creation and attribute injections
are done. Takes method name and injectable value.
+ :py:class:`dependency_injector.injections.Arg` - injection is done by
passing injectable value in object's ``__init__()`` method in time of
object's creation as positional argument. Takes injectable value only.
+ :py:class:`dependency_injector.injections.KwArg` - injection is done by
passing injectable value in object's ``__init__()`` method in time of
object's creation as keyword argument. Takes keyword name of
``__init__()`` argument and injectable value.
+ :py:class:`dependency_injector.injections.Attribute` - injection is done
by setting specified attribute with injectable value right after
object's creation. Takes attribute's name and injectable value.
+ :py:class:`dependency_injector.injections.Method` - injection is done by
calling of specified method with injectable value right after object's
creation and attribute injections are done. Takes method name and
injectable value.
All ``di.Injection``'s injectable values are provided *"as is"*, except of
providers (subclasses of ``di.Provider``). Providers will be called every time,
when injection needs to be done.
All :py:class:`dependency_injector.injections.Injection`'s injectable values
are provided *"as is"*, except of providers (subclasses of
:py:class:`Provider`). Providers will be called every time, when injection
needs to be done.
Factory providers and attribute injections
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Example below shows how to create ``di.Factory`` of particular class with
Example below shows how to create :py:class:`Factory` of particular class with
attribute injections. Those injections are done by setting specified attributes
with injectable values right after object's creation.
@ -123,10 +131,10 @@ Example:
Factory providers and method injections
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Current example shows how to create ``di.Factory`` of particular class with
method injections. Those injections are done by calling of specified method
with injectable value right after object's creation and attribute injections
are done.
Current example shows how to create :py:class:`Factory` of particular class
with method injections. Those injections are done by calling of specified
method with injectable value right after object's creation and attribute
injections are done.
Method injections are not very popular in Python due Python best practices
(usage of public attributes instead of setter methods), but they may appear in
@ -142,21 +150,21 @@ Example:
Factory providers delegation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
``di.Factory`` provider could be delegated to any other provider via any kind
of injection. As it was mentioned earlier, if ``di.Factory`` is injectable
value, it will be called every time when injection is done. ``di.Factory``
delegation is performed by wrapping delegated ``di.Factory`` into special
provider type - ``di.Delegate``, that just returns wrapped ``di.Factory``.
Saying in other words, delegation of factories - is a way to inject factories
themselves, instead of results of their calls.
:py:class:`Factory` provider could be delegated to any other provider via any
kind of injection. As it was mentioned earlier, if :py:class:`Factory` is
injectable value, it will be called every time when injection is done.
:py:class:`Factory` delegation is performed by wrapping delegated
:py:class:`Factory` into special provider type - :py:class:`Delegate`, that
just returns wrapped :py:class:`Factory`. Saying in other words, delegation
of factories - is a way to inject factories themselves, instead of results
of their calls.
Actually, there are two ways of creating factory delegates:
+ ``di.Delegate(di.Factory(...))`` - obviously wrapping factory into
``di.Delegate`` provider.
+ ``di.Factory(...).delegate()`` - calling factory ``delegate()`` method, that
returns delegate wrapper for current factory.
+ ``Delegate(Factory(...))`` - obviously wrapping factory into
:py:class:`Delegate` provider.
+ ``Factory(...).delegate()`` - calling factory :py:meth:`Factory.delegate`
method, that returns delegate wrapper for current factory.
Example:

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@ -1,13 +1,13 @@
"""`di.Factory` providers example."""
"""`Factory` providers example."""
import dependency_injector as di
from dependency_injector import providers
class User(object):
"""Example class User."""
# Factory provider creates new instance of specified class on every call.
users_factory = di.Factory(User)
users_factory = providers.Factory(User)
# Creating several User objects:
user1 = users_factory()

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@ -1,6 +1,7 @@
"""`di.Factory` providers with attribute injections example."""
"""`Factory` providers with attribute injections example."""
import dependency_injector as di
from dependency_injector import providers
from dependency_injector import injections
class User(object):
@ -20,11 +21,13 @@ class CreditCard(object):
"""Example class CreditCard."""
# User, Photo and CreditCard factories:
credit_cards_factory = di.Factory(CreditCard)
photos_factory = di.Factory(Photo)
users_factory = di.Factory(User,
di.Attribute('main_photo', photos_factory),
di.Attribute('credit_card', credit_cards_factory))
credit_cards_factory = providers.Factory(CreditCard)
photos_factory = providers.Factory(Photo)
users_factory = providers.Factory(User,
injections.Attribute('main_photo',
photos_factory),
injections.Attribute('credit_card',
credit_cards_factory))
# Creating several User objects:
user1 = users_factory()

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@ -1,6 +1,6 @@
"""`di.Factory` providers delegation example."""
"""`Factory` providers delegation example."""
import dependency_injector as di
from dependency_injector import providers
class User(object):
@ -9,7 +9,7 @@ class User(object):
def __init__(self, photos_factory):
"""Initializer.
:param photos_factory: (di.Factory) -> Photo
:param photos_factory: providers.Factory -> Photo
"""
self.photos_factory = photos_factory
self._main_photo = None
@ -27,9 +27,9 @@ class Photo(object):
"""Example class Photo."""
# User and Photo factories:
photos_factory = di.Factory(Photo)
users_factory = di.Factory(User,
photos_factory=di.Delegate(photos_factory))
photos_factory = providers.Factory(Photo)
users_factory = providers.Factory(User,
photos_factory=photos_factory.delegate())
# Creating several User objects:
user1 = users_factory()

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@ -1,6 +1,6 @@
"""`di.Factory` providers with init positional injections example."""
"""`Factory` providers with init positional injections example."""
import dependency_injector as di
from dependency_injector import providers
class User(object):
@ -16,8 +16,8 @@ class Photo(object):
"""Example class Photo."""
# User and Photo factories:
photos_factory = di.Factory(Photo)
users_factory = di.Factory(User, photos_factory)
photos_factory = providers.Factory(Photo)
users_factory = providers.Factory(User, photos_factory)
# Creating several User objects:
user1 = users_factory() # Same as: user1 = User(Photo())

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@ -1,6 +1,6 @@
"""`di.Factory` providers with init injections priority example."""
"""`Factory` providers with init injections priority example."""
import dependency_injector as di
from dependency_injector import providers
class User(object):
@ -30,11 +30,11 @@ class CreditCard(object):
"""Example class CreditCard."""
# User, Photo and CreditCard factories:
credit_cards_factory = di.Factory(CreditCard)
photos_factory = di.Factory(Photo)
users_factory = di.Factory(User,
main_photo=photos_factory,
credit_card=credit_cards_factory)
credit_cards_factory = providers.Factory(CreditCard)
photos_factory = providers.Factory(Photo)
users_factory = providers.Factory(User,
main_photo=photos_factory,
credit_card=credit_cards_factory)
# Creating several User objects:
user1 = users_factory(1)

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@ -1,6 +1,6 @@
"""`di.Factory` providers with init keyword injections example."""
"""`Factory` providers with init keyword injections example."""
import dependency_injector as di
from dependency_injector import providers
class User(object):
@ -16,8 +16,8 @@ class Photo(object):
"""Example class Photo."""
# User and Photo factories:
photos_factory = di.Factory(Photo)
users_factory = di.Factory(User, main_photo=photos_factory)
photos_factory = providers.Factory(Photo)
users_factory = providers.Factory(User, main_photo=photos_factory)
# Creating several User objects:
user1 = users_factory() # Same as: user1 = User(main_photo=Photo())

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@ -1,6 +1,7 @@
"""`di.Factory` providers with method injections example."""
"""`Factory` providers with method injections example."""
import dependency_injector as di
from dependency_injector import providers
from dependency_injector import injections
class User(object):
@ -28,11 +29,13 @@ class CreditCard(object):
"""Example class CreditCard."""
# User, Photo and CreditCard factories:
credit_cards_factory = di.Factory(CreditCard)
photos_factory = di.Factory(Photo)
users_factory = di.Factory(User,
di.Method('set_main_photo', photos_factory),
di.Method('set_credit_card', credit_cards_factory))
credit_cards_factory = providers.Factory(CreditCard)
photos_factory = providers.Factory(Photo)
users_factory = providers.Factory(User,
injections.Method('set_main_photo',
photos_factory),
injections.Method('set_credit_card',
credit_cards_factory))
# Creating several User objects:
user1 = users_factory()