Django: How does django-admin-sortable2 package code work?

Question

I am using a package called "django-admin-sortable2" but I do not understand what I am coding. May someone explain?

Here's what I used: https://django-admin-sortable2.readthedocs.io/en/latest/usage.html#sortable-many-to-many-relations-with-sortable-tabular-inlines

Here's the GitHub repository: https://github.com/jrief/django-admin-sortable2

Here's the code example they used:

models.py

from django.db.import models

class Button(models.Model):
    """A button"""
    name = models.CharField(max_length=64)
    button_text = models.CharField(max_length=64)

class Panel(models.Model):
    """A Panel of Buttons - this represents a control panel."""
    name = models.CharField(max_length=64)
    buttons = models.ManyToManyField(Button, through='PanelButtons')

class PanelButtons(models.Model):
    """This is a junction table model that also stores the button order for a panel."""
    panel = models.ForeignKey(Panel)
    button = models.ForeignKey(Button)
    button_order = models.PositiveIntegerField(default=0)

    class Meta:
        ordering = ('button_order',)

admin.py

from django.contrib import admin
from adminsortable2.admin import SortableInlineAdminMixin
from models import Panel

class ButtonTabularInline(SortableInlineAdminMixin, admin.TabularInline):
    # We don't use the Button model but rather the juction model specified on Panel.
    model = Panel.buttons.through

@admin.register(Panel)
class PanelAdmin(admin.ModelAdmin)
    inlines = (ButtonTabularInline,)

Django: How does django-admin-sortable2 package code work?

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