Plugin schedule fix (#4295)

* Cleanup old info message (seems out of place)

* Wrap called function in quotes

- Doesn't work if you pass the function object itself

* Fix path to called method

This must have been broken for a while?

InvenTree/plugin/apps.py

@@ -53,6 +53,3 @@ class PluginAppConfig(AppConfig):
 
         if not registry.git_is_modern:  # pragma: no cover  # simulating old git seems not worth it for coverage
             log_error(_('Your environment has an outdated git version. This prevents InvenTree from loading plugin details.'), 'load')
-
-        else:
-            logger.info("Plugins not enabled - skipping loading sequence")  # pragma: no cover

InvenTree/plugin/base/integration/mixins.py

@@ -12,7 +12,6 @@ import InvenTree.helpers
 from plugin.helpers import (MixinImplementationError, MixinNotImplementedError,
                             render_template, render_text)
 from plugin.models import PluginConfig, PluginSetting
-from plugin.registry import registry
 from plugin.urls import PLUGIN_BASE
 
 logger = logging.getLogger('inventree')
@@ -153,12 +152,14 @@ class ScheduleMixin:
             for key, task in self.scheduled_tasks.items():
 
                 task_name = self.get_task_name(key)
+
                 obj = {
                     'name': task_name,
                     'schedule_type': task['schedule'],
                     'minutes': task.get('minutes', None),
                     'repeats': task.get('repeats', -1),
                 }
+
                 func_name = task['func'].strip()
 
                 if '.' in func_name:
@@ -167,7 +168,7 @@ class ScheduleMixin:
                 else:
                     """Non-dotted notation indicates that we wish to call a 'member function' of the calling plugin. This is managed by the plugin registry itself."""
                     slug = self.plugin_slug()
-                    obj['func'] = registry.call_plugin_function
+                    obj['func'] = 'plugin.registry.call_plugin_function'
                     obj['args'] = f"'{slug}', '{func_name}'"
 
                 if Schedule.objects.filter(name=task_name).exists():

InvenTree/plugin/samples/integration/scheduled_task.py

@@ -27,6 +27,7 @@ class ScheduledTaskPlugin(ScheduleMixin, SettingsMixin, InvenTreePlugin):
     NAME = "ScheduledTasksPlugin"
     SLUG = "schedule"
     TITLE = "Scheduled Tasks"
+    VERSION = "0.2.0"
 
     SCHEDULED_TASKS = {
         'member': {