Registerer
Bases: typing.Generic[T]
A utility that can be used to create a registry object to register class or functions.
Source code in registerer/registry.py
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|
items: typing.List[typing.Type[T]]
property
Get actual registered items as list (classes or functions)
__init__(parent_class=None, *, slug_attr=None, max_size=None, validators=None)
Parameters:
Name | Type | Description | Default |
---|---|---|---|
parent_class |
typing.Optional[typing.Type[T]]
|
The class of parent. If you set this, the registered class should be subclass of the this, If it's not the register method going to raise RegistrationError. Also by setting this you'll be benefit from type hints in your IDE. |
None
|
slug_attr |
typing.Optional[str]
|
Pass the attribute name of registered item that you want to set registry slug to or read from registered item. |
None
|
max_size |
typing.Optional[int]
|
allowed size of registered items. Defaults to None which means there is no limit. |
None
|
validators |
typing.Optional[typing.List[RegistryValidator]]
|
custom validation for on registering items. |
None
|
Raises:
Type | Description |
---|---|
RegistryCreationError
|
Can't create proper registry object. |
Source code in registerer/registry.py
is_registered(slug)
__getitem__(registry_slug)
get the registered item by slug
Source code in registerer/registry.py
get(registry_slug, default=None)
Return the value for key if key is in the registry, else default.
validate(item)
Validate the item during registration.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
item |
T
|
item want to register. |
required |
Raises:
Type | Description |
---|---|
RegistrationError
|
can't register this item. |
Source code in registerer/registry.py
register(custom_slug=None, **kwargs)
Register a class or item to the registry example:
# register the item with it's name
@registry.register()
class Foo:
pass
assert registry["Foo"] == Foo
# register the item with a custom name
@registry.register("bar")
class Bar:
pass
assert registry["bar"] == Bar
# register the item with a custom name and also add some other attributes to it.
# it is more useful when registering functions.
@db_registry.register("postgresql", env="prod")
def postgresql_connection:
pass
assert registry["postgresql"] == postgresql_connection
assert postgresql_connection.env == "prod"
Parameters:
Name | Type | Description | Default |
---|---|---|---|
custom_slug |
str
|
the unique identifier for the item. |
None
|
Raises:
Type | Description |
---|---|
ItemAlreadyRegistered
|
There is another item already registered with this slug. |
RegistrationError
|
can't register this item. |
Source code in registerer/registry.py
unregister(registry_slug)
Unregister the item with given slug.
Source code in registerer/registry.py
filter(function)
Filter the registry with given callback and create another subset registry with desired items in it.
Source code in registerer/registry.py
attrs_as_tuples(*args, flat=False)
Returns list of tuples of based on attributes of registered items. You can use this to create choices for Django model field.
Inspired by values_list in Django's QuerySet.
registry = registerer.Registerer()
@registry.register()
class ContestStep:
slug = "contest"
name = "Contest"
@registry.register()
class CollegeStep:
slug = "college"
name = "College"
assert registry.attrs_as_tuples("slug", "name") == [("contest", "Contest"), ("college", "College")]
assert registry.attrs_as_tuples("slug", flat=True) == ["contest", "college"]
class Step(django.db.models.Model):
step_slug = models.CharField(max_length=100, choices=registry.attrs_as_tuples("slug", "name"))