django-mptt | modified pre-order traversal tree | Dataset library

In Django, the gettext_lazy(…) function [Django-doc] is often imported as _ to manage translations. This is explained in the Standard translation:

Python’s standard library gettext module installs _() into the global namespace, as an alias for gettext(). In Django, we have chosen not to follow this practice, for a couple of reasons

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Because of how xgettext (used by makemessages) works, only functions that take a single string argument can be imported as _:

• gettext()
• gettext_lazy()

You thus should add:

Regardless what the underlying type is, Django will transform a UUID to the correct format, and insert it in the database. For SQLite that thus means that the UUIDField will tranform it to a string.

You thus can create an item with:

You can do it in an extra step. You need to get child categories and then filter products by them. Example code:

Couple workaround solutions (apart from turning off the browserable API completely):

1. Turn off the browserable API just for that view

2. Update permissions.py with a specific condition for "list_id":

This is a known issue with cpython on windows. The error occurs when black tries to run multiple workers on >60 core machines because the default number of process workers given by os.cpu_count() breaks some other windows limit (number of waiting processes? I'm not quite sure). Black >=19.10b0 has a fix for this, so try updating the version of black in your pre-commit config if you can?

• Python bug report: https://bugs.python.org/issue26903
• Fix applied by this PR in black: https://github.com/psf/black/pull/838

I never used mptt but after a brief look into the docs something like that should work.

The reason that you got an error when you removed the name field is because the order_insertion_by option [readthedocs.io] was referring to that field. But you can let it refer to another field. As the documentation says:

order_insertion_by

A list of field names which should define ordering when new tree nodes are being inserted or existing nodes are being reparented, with the most significant ordering field name first. Defaults to [].

It is assumed that any field identified as defining ordering will never be NULL in the database.

You can thus for example make use of the primary key instead:

The name of your template variable is listing, not nodes:

You need to make Category a subclass of MPTTModel: