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        print('instance', dir(template_context['instance']))
        
 > lists all variable fields

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results = myModel.objects.values().annotate(
  group_representative=ArrayAggFirstElem('pk', distinct=True),
)
group_representatives = results.values_list('group_representative', flat=True)

assert_(
    results.count() == group_representatives.count(),
    'Aggregation Spec should partition the results space (no overlaps)'
)

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version: "3"

volumes:
  local_postgres_data: {}
  local_postgres_data_backups: {}

services:
  django: &django
    build:
      context: .

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#!/bin/bash
yum update -y
yum install -y httpd
systemctl start httpd
systemctl enable httpd
echo "<h1>Hello World from $(hostname -f)</h1>" > /var/www/html/index.html

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Deploying a Production ready Django app on AWS

In this tutorial, I will be going over to how to deploy a Django app from start to finish using AWS and EC2. Recently, my partner Tu and I launched our app Hygge Homes (a vacation home rental app for searching and booking vacation homes based off Airbnb) and we wanted to share with other developers some of the lessons we learned along the way.

Following this tutorial, you will have an application that has:

• An AWS EC2 server configured to host your application
• SSL-certification with Certbot
• A custom domain name
• Continuous deployment with Github Actions/SSM Agent

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class Tree:
    def __init__(self, data):
        self.left = None
        self.right = None
        self.data = data
        
    def insert(self, data):
        if self.data:
            if isinstance(self.data, int):
                if self.left is None:

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/Users/harrymoreno/.local/share/virtualenvs/litt-api-HgI9cQzm/lib/python3.6/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
  """)
Traceback (most recent call last):
  File "/Users/harrymoreno/.local/share/virtualenvs/litt-api-HgI9cQzm/lib/python3.6/site-packages/django/db/backends/utils.py", line 83, in _execute
    return self.cursor.execute(sql)
psycopg2.ProgrammingError: permission denied to create extension "postgis"
HINT:  Must be superuser to create this extension.


The above exception was the direct cause of the following exception:

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"""
Update alternate instances of a model in the database.
"""
from app.models import Post
ids_to_update = list(Post.objects.all().values_list('id', flat=True))[1::2]
Post.objects.filter(id__in=ids_to_update).update(some_field='some value')

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$ ./k
2020.02.25 (c) shakti
 /
/
 \
$k a.k

Verb                      Adverb                 Noun           Type  System
:  set                    '  each                char  " a"        c  \l a.k
+  plus       flip        /  over/right i enc    name  ``ab        n *\d [d]

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Intro to Smart Contract Development, Jan 2020

Agenda

1. Go through slides https://github.com/MetaMask/IPFS-Ethereum-Hackathon/blob/master/slides/01_DanFinlay_intro_to_ethereum_blockchains/DanFinlay-intro_to_ethereum.pdf
2. deploy ballot to test net
3. go over solidity language
4. deploy ico to test net
5. build webapp with truffle
6. (stretch) deploy bonding curve token https://github.com/yosriady/continuous-token