`LabelCommand`: `label` does not affect the `missing_args_message`

[Kamil Paduszyński]

The missing_args_message attribute of the django.core.management.base.LabelCommand is hard coded using the default value of label = "label".

I would suggest the following update:

class LabelCommand(BaseCommand):
    label = "label"
    missing_args_message = "Enter at least one %s."

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        
        self.missing_args_message = (
            (missing_args_message % self.label)
            if (missing_args_message := self.missing_args_message) is not None
            else None
        ) 

Of course, I am open to refactoring - a single, complex though, conditional assignment allows for avoiding branching.

It can be tested by updating the test_label_command_no_label case.

[Sarah Boyce]

Thank you!
Replicated - example failing test

tests/staticfiles_tests/test_management.py

@@ -124 +124 @@
             searched_locations,
         )
 
+    def test_missing_args_message(self):
+        msg = "Enter at least one staticfile."
+        with self.assertRaisesMessage(CommandError, msg):
+            call_command("findstatic")
+

Would you like to submit a PR?

[Giovanni Fabbretti]

Hello,
I have created a ​PR implementing the test proposed by Sarah and the solution proposed by Kamil.

[Sarah Boyce <42296566+sarahboyce@…>]

In f72bbd44:

Fixed #35689 -- Handled custom labels in LabelCommand.missing_args_message.