#27747: Add signals for Django management commands
-------------------------------------+-------------------------------------
Reporter: Dmitry | Owner: nobody
Gladkov |
Type: New | Status: new
feature |
Component: Core | Version: master
(Management commands) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Related PR: https://github.com/django/django/pull/7857
Suggested example usage (I know that a string can't be a signal sender,
this is just for illustrating the point):
{{{#!python
from django.core.management import signals
def handle_pre(sender, instance):
instance.stdout.write('Hello World')
def handle_post(sender, instance):
instance.stdout.write('Bye World')
signals.pre_command.connect(handle_pre, sender='runserver')
signals.post_command.connect(handle_post, sender='runsever')
}}}
Reasoning:
Currently overriding of commands in Django can only be achieved by
shadowing existing commands using `INSTALLED_APPS` initialization order.
This is a perfectly good solution if a user needs to completely override a
command, but it's not ideal for extending/adding functionality to existing
commands. Extending the same command from different apps will not work as
only the extended command from the latest `INSTALLED_APPS` entry will run
(see Example 2).
Some examples of actions that can be achieved using singals:
1. Pulling remote translations before `compilemessages`.
2. Showing coverage or/and generating xml report after `test`.
3. Running optipng on collected static images after `collectstatic`
4. Displaying useful information like outdated package versions before
`runserver`.
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Ticket URL: <https://code.djangoproject.com/ticket/27747>
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