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Vladimir Sidorenko, Gearheart CEO

Dive into our guide to RESTful API best practices

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5 Best Practices of RESTful API Design to Keep Your Users Happy

Top 5 Restful API Design Best Practices | Gearheart

Having HIPAA compliance software is a required practice for all healthcare organizations by the U.S. government. Here’s a development checklist for securing your data.

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Having HIPAA compliance software is a required practice for all healthcare organizations by the U.S. government. Here’s a development checklist for securing your data. 

Checklist for HIPAA Compliance Software Development

HIPAA Compliance Software Development [Checklist for 2021]

We reviewed the best payment gateways in 2020. Here’s our comparison of their features, advantages, and disadvantages.

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5 Best Payment Gateways For 2020

5 Best Payment Gateways For 2020 [Providers Comparison]

In this article we'll review general approach to working with the best kind of projects - the ones with old untested and undocumented spaghetti code and a tight schedule. We'll review anger management techniques, coping mechanisms and some refactoring tips that might come in handy.

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How to Work With Legacy Code: Code Refactoring Techniques

Tips on working with the legacy code

Lead management is an important part of the marketing strategy of every company of any size. Besides automating various business processes, privately-held organizations should consider implementing an IT solution that would help them manage their leads. So, how should you make a web-based leads management system for a University in order to significantly increase sales?

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How to Build a Cloud-Based Leads Management System for Universities

Programmatic generation of PDF files is a frequent task when developing applications that can export reports, bills, or questionnaires. In this article, we will consider three common tools for creating PDFs, including their installation and converting principles.

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How to Generate PDF Files in Python with Xhtml2pdf, WeasyPrint or Unoconv

Are you a sports enthusiast, or maybe you own a gym? Do you want to build a custom workout tracking software solution for your needs and the needs of your clients? If you do, you are on the right track.

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How to Build a Handy Workout Planning Platform?

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Workout Tracking Software: How To Develop Useful Solution?

This article will tell about the development of a course scheduling application which would incorporate some new ideas.

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How to Develop a Classroom Scheduling Application

In this article we will tell how to create a good application for runners, which can become an analogue of RunKeeper.

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How to Build a Run Tracker Like a Runkeeper?

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This article is aimed for beginners, who are trying to choose between Ruby on Rails and Django. Let’s see which is fastest and why.

Django vs Rails Performance

Ruby on Rails vs Django Performance Comparison

Auto dealership along with autopart trading and car service has always been a very competitive field. Especially these days companies have to use all possible and affordable ways to stay afloat. But to be a successful company auto dealer should not just move forward but accelerate this movement.

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Reasons to develop custom software for Auto Dealer

In this article, we will compare two most popular JS Libraries (Angular vs React). Both of them were created by professionals and have been used in famous big projects.

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Angular vs React Comparison

Angular vs React. How to Choose a Front-end Library?

One of the things we are proud about is our estimation process. Partners and clients regularly ask how we do those and how we manage to meet our deadlines, so I decided to describe our simple recipe.

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How we meet our estimations

Quite often we have to write paginated or filtered blocks of information on page. I created a decorator that would automate this process.

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Ajax blocks in Django

When we use css-sprites it's important to make browser cache them for longest period possible. On other hand, we need to refresh them when they are updated. This is especially visible when all icons are stored in single sprite. When it's outdated - entire site becomes ugly.

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When we use css-sprites it's important to make browser cache them for longest period possible. On other hand, we need to refresh them when they are updated. This is especially visible when all icons are stored in single sprite. When it's outdated - entire site becomes ugly. To solve this task I've implemented this small script that adds file's hash to url:background-image: url(images/icons.png?a3844c660);

Sprite cache invalidation

I've created this small sprite to create css sprites. It glues images from directory directory into single file and generates corresponding css.

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Css sprite generation

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In VIM there is a command for char search: f. After first use it can be repeated with ;. I like to navigate in line with it. You see that you need to go to bracket in a middle of a line - you press f( and one-two ; and you are there. There's no such command in Emacs, so I had to write my own. I've managed even to implement repetition with ;.

Char search in Emacs as in Vim

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In order to check if user is authentcated in test, you can run: from django.contrib.auth import get_user class MyTestCase(TestCase): def test_login(self): self.assertFalse(get_user(self.client).is_authenticated()) self.client.login(username='fred', password='secret') self.assertTrue(get_user(self.client).is_authenticated())

Testing authentication in Django

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I just found out that __or__ and __and__ are defined for QuerySet. This means that to do queries union or intersection, you can do:User.objects.filter(...) | User.objects.filter(...)User.objects.filter(...) & User.objects.filter(...)

OR and AND without django.db.models.Q

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It appears that not everyone knows that in python you can create classes dynamically without metaclasses. I'll show an example of how to do it.So we've learned how to use custom QuerySet to chain requests:Article.objects.old().public()Now we need to make it work for related objects:user.articles.old().public()This is done using use_for_related_fields, but it needs a little trick.

Dynamic class generation, QuerySetManager and use_for_related_fields

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As you know, model managers can be overriden in Django. It's convenient to add custom filtration method there:Article.objects.published()Article.objects.old()But these custom methods cannot be chained:Article.objects.published().old()In this article I'll explain how this can be solved.

Overriding QuerySet in Django

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In my current project I had a task to use twitter API. Twitter uses OAuth for authentication, which is pretty dreary. To avoid fiddling with it all the time, I've moved authentication to decorator. If key is available - nothing happens, just view is launched as usual. It's convenient that there's no need for additional twitter settings in user profile. Code is in article.

Twitter API, OAuth and decorators

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For local project settings, I use old trick with settings_local file:try:from settings_local import \*except ImportError:passSo in settings_local.py we can override variables from settings.py. I didn't know how to supplement them. For example how to add line to INSTALLED_APPS without copying whole list.Yesterday I finally understood that I can import settings from settings_local:# settings_local.pyfrom settings import \*INSTALLED_APPS += (# ...)

Supplementing settings in settings_local

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There was a task to submit form with ajax, with server side validation of course. Obvious solution is to do validation and return json with erros. I didn't like idea of writing separate view for validation and then inserting errors in form html on client side. Especially since I already had a generic template for django form with errors display. In this article I'll describe how I solved the task.

Ajax form validation

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In UNIX way, each view should solve single task. This is good idea, but sometimes we need to mix logic of different views on same page. Filter, sort, paginate, or, for example, add comment on product page. In this article I'll show how we can mix such multiple views.

Composing multiple views in Django

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In my recent project there was a lot of data business logic, so I had to organize this code somehow. In this article I'll describe a few hints on how to it.

Business logic in models

Usually users' profiles are stored in single model. When there are multiple user types, separation is made by some field like user_type.Situation is a little more complicated when different data is needed for each user type.In this article I'll describe how I solve this task.

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User profiles with inheritance in Django

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Everybody knows about permalink, but it's usually used only in get_absolute_url. I prefer to use it for all related model urls.class Event(models.Model):# ...@models.permalinkdef edit_url(self):return ('event_edit', (self.pk, ))And then in template:<a href="{{ event.edit_url }}">Редактировать событие</a>

Absolute urls in models

Vladimir Sidorenko

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WHEN I WAS 12, MY FATHER BOUGHT ME MY FIRST BOOK ON PROGRAMMING. I'VE BEEN HOOKED EVER SINCE.

These are some of Vladimir’s projects