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from model_utils.managers import InheritanceManagerMixin, InheritanceQuerySetMixin
from treebeard.mp_tree import MP_NodeManager, MP_NodeQuerySet, MP_Node


class PolymorphicTreeQuerySet(InheritanceQuerySetMixin, MP_NodeQuerySet):
    """QuerySet combining functionality of polymorphic up-casting with Materialized Path tree structure"""


class PolymorphicTreeManager(InheritanceManagerMixin, MP_NodeManager):
    _queryset_class = PolymorphicTreeQuerySet

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def is_related_loaded(instance: models.Model, related_model: Type[models.Model]) -> bool:
    """
    Checks if the model ``instance`` has a cached related field to a ``related_model``.
    The relation is cached as a consequence of calling the ``qs.select_related('related_model')``.

    This function is useful if you are doing ``qs.select_related('foo', 'bar')`` for backref relations,
    and there's only either of them available on the resulting object.

    >>> class Test(models.Model): ...
    >>> class Foo(models.Model): ...

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👉Boot linux from USB stick in live mode.

---

In case your computer has UEFI BIOS execute these commands:

sudo mount /dev/sdXXX /mnt
sudo mount /dev/sdXX /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done

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/**
 * Returns an object with definition of <b-field :type> for Buefy.
 *
 * Instead of setting the field type like this:
 *
 *    <b-field :type="{ 'is-danger': errors.has('field_name') }"></b-field>
 *
 * You can now use it like this:
 *
 *    get fieldTypes() {

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// do something 10 times
'.'.repeat(10).split('').forEach(dot => doSomething());

// add 7 more `{}` to `rows`
const rows = [{}, {}];
Array(7).fill({}).map(o => rows.push({}))

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// See https://pl.wikipedia.org/wiki/PESEL#Data_urodzenia
// See https://en.wikipedia.org/wiki/PESEL#Birthdates
const CENTURY_MAP: {[k: number]: number} = {
  0: 1900,
  1: 2000,
  2: 2100,
  3: 2200,
  4: 1800,
};

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rancher:
  network:
    interfaces:
      eth0:
        address: 192.168.0.100/24
        gateway: 192.168.0.1
    dns:
      nameservers:
      - 8.8.8.8
      - 8.8.4.4

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Dell Fan Control Commands

print temps and fans rpms

ipmitool -I lanplus -H <iDRAC-IP> -U <iDRAC-USER> -P <iDRAC-PASSWORD> sensor reading "Ambient Temp" "FAN 1 RPM" "FAN 2 RPM" "FAN 3 RPM"

print fan info

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Introduction

Docker.app will complain about incompatible processor, so we will use Docker Machine.

Instalation

Download Docker for Mac (Docker.app). It contains some binaries that are necessary.

brew install virtualbox docker-machine

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Securely erase an external disk using dd on OSX

1. Plug in your SD card, HDD, or other block device and then use the following command to see which /dev/diskN node it's located on:

diskutil list

2. Unmount the disk where “N� is the number of the disk taken from the above command: