#29554: Allow loading apps dynamically at runtime
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Reporter: Christian González | Owner: nobody
Type: New feature | Status: closed
Component: Core (Other) | Version: 2.0
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Christian González):
Should I discuss this on the mailing list then, or here?
Just to answer your questions:
* regarding the INSTALLED_APPS order: Sure, if you have a stati
application, this order makes sense. If you have an application that uses
plugins, the application itself is responsible for the order the plugins
are loaded. To make this deterministic, would be nonsense IMHO, as
different applications use different plugin methods (Django provides
None). So It could be that there is a "plugin resolution order" where
dependendant plugins are loaded after their dependencies - which makes
sense, or the app could decide that plugins define an integer "weight"
(which is no good practice IMHO), etc. So, that's the sense of "dynamic"
apps.
* Regarding templates, and which app wins - I always fount the templating
system a bit difficult - IMHO app templates should have implicit
namespaces. But that would break virtually any existing Django install -
so forget it. But: Same as before: The loading order decides, like in
{{{INSTALLED_APPS}}}. Let the application decide in which order the
plugins should be loaded.
In my simple mind, I call {{{apps.populate([myfirstapp_plugin,
other_plugin, last_plugin_app])}}} like setup.py calls it with
{{{settings.INSTALLED_APPS}}}. And populate works through all he apps **in
this order** and merges them into the system.
I wrote a Django application that merely consists of the plugin system.
The "real" main application is already a "Core" plugin (with a version
etc) which is listed in INSTALLED_APPS as app, because it is always loaded
and part of the base system. And all other plugins are loaded dynamically.
So they can have dependencies like "core>=1.5.2" and it won't load it when
the core version is below that. It's pre-alpha, just look here for the
extension system
[https://gitlab.com/nerdocs/medux/MedUX/tree/develop/medux/extensionsystem]
(e.g. the PluginManager, is in development. I'm no professional software
engineer, so please look away if you see horrible coding style ;-) - or
better tell me)
I tried really many ways to accomplish that, and some of the first ones
were plugins that are no django apps. But I came across some issues, and
had to rewrite much of the stuff Django does already perfectly, like
loading models, migrations, etc. So in the sense of DRY, I wanted to have
plugins being Django apps. But there the problem I describe here starts: I
have to restart the server, rewriting the settings.py - which is nonsense
in my eyes.
--
Ticket URL: <https://code.djangoproject.com/ticket/29554#comment:4>
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