AyemunHossain

from django.utils.cache import add_never_cache_headers

class DisableClientSideCachingMiddleware(object):
    """
    Internet Explorer / Edge tends to cache REST API calls, unless some specific HTTP headers are added by our
    application.

    - no_cache
    - no_store
    - must_revalidate

AyemunHossain

from time import time
def performance(fn):
  def wrapper(*args, **kwargs):
    t1 = time()
    result = fn(*args, **kwargs)
    t2 = time()
    print(f'took {t2-t1}')
    return result
  return wrapper

AyemunHossain

class NewRange:
    current = 0
    def __init__(self, first, last):
        self.first = first
        self.last = last
    
    def __iter__(self):
        return self
    
    def __next__(self):

AyemunHossain

from rest_framework import viewsets

from .models import MyModel
from .serializers import MyModelWriteSerializer, MyModelReadSerializer


class MyViewSet(viewsets.ModelViewSet):
    queryset = MyModel.objects.all()

    def get_serializer_class(self):

AyemunHossain

DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.postgresql",
        "NAME": "***********",
        "USER": "************",
        "PASSWORD": "*********",
        "HOST": "localhost",
        "PORT": "5432",
    }
}

AyemunHossain

sudo sysctl -w fs.inotify.max_user_watches=XXXXX

HERE XXXXX IS THE NUMBER OF FILE YOU WANT TO ADD IN WATCH LIST.

Typically what i do is : 1000000
So the final CMD is : sudo sysctl -w fs.inotify.max_user_watches=1000000

AyemunHossain

  sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
  sudo /sbin/mkswap /var/swap.1
  sudo /sbin/swapon /var/swap.1

AyemunHossain

Data Format: 
_DB
___Collction
______Sub Collection
__________Data


TestChatHistory --------------------------------------->(Main DB)
>268  ------------------------------------------------->(Collection)
>>2691680604235655  ----------------------------------->(Sub-collection)

AyemunHossain

Airlines.findById(id)
      .populate({
        path: 'flights',
        populate:[
          {
            path: 'planeType',
            model: 'Plane'
          },
          {
          path: 'destination',

AyemunHossain

'use strict';

var firebase = require("firebase");

exports.handler = (event, context, callback) => {
    context.callbackWaitsForEmptyEventLoop = false;  //<---Important

    var config = {
        apiKey: "<<apikey>>",
        authDomain: "<<app_id>>.firebaseapp.com",