Aurora Borealis

Django Post Idea

Tue, 22 Jan 2019 02:20:00 +0000

Wow, it’s already 2019! And I just skipped 2018 without even a single post! For this post, I just want to write short.

So far, I have two ideas on writing a new post. They are:

Migrating legacy Django hash password
Testing Django form with real data

Let’s hope I can write this soon. See you!

Test Python/Django Script

Mon, 27 Mar 2017 15:00:00 +0000

Now I am thinking a better approach on testing Python/Django script. I have a Python script which runs in a Django application. For example, this script will send an email with how many new users registered in this week.

So far, I use the manual approach, which requires me to have new user registered within this week. I am not very satisfied with this approach, as the script is getting complex, I need to manually prepare the data.

Any idea?

Fail Running Test Code

Wed, 26 Oct 2016 16:56:24 +0000

I was recalling, how did I run the test code. Until I found that I had written the snippet. I copy-paste it… and the test code was fail. Something wrong. No changes in the test code since my last commit.

I tried the other test code. Looks OK. I tried to rename the fail test code filename, still no good. So, what’s the problem?

Until I found this stackoverflow question.

So, I tried to import the modules written in the test code via shell. Finally now I know which part of the code that fails to import the library.

MelbDjango Camp

Wed, 16 Dec 2015 16:56:24 +0000

It’s almost a month passed by from MelbDjango camp. I was planning to write a short review about it. So, let’s just give it a start. Better late than never.

For me, Django community in Melbourne has been a very vibrant community. You name it! They have meetups, school, hack weekend and lastly the camp initiative. And I’ve learned a lot from the community.

The camp lasted for two days and two nights. Basically we working on our own Django projects. And when you got stuck on something, there’s always someone who will help you.

I was working on two Django projects. The first one, I was trying to visualize a Django app using d3.js Then the second one, I was trying to build a geographic information Django app. I also learned how to setup Django using PostgreSQL as the backend.

Other than that, there were three workshops. The first one was Django-low down (Django slow down). We’re going through the Django docs and start creating a Django application from the scratch.

The second was creating a vulnerable Django application. The reason was to prevent creating a vulnerable application by getting know what is a vulnerable Django application.

And the last workshop was about Django template. What has Django template working for us, why Django template is slow, and so on.

This camp was a great experience for me! I knew about redshift: an app that adjust your computer screen according to your position. At first I was surprised when I saw other’s monitor screen turning into red. Then I knew how to work on Django project tickets.

Django Filter Query Exception

Mon, 29 Jun 2015 11:44:20 +0000

While looking for answers on this question: “Does multiple monitor increase programmer’s productivity?”, I found interesting tips from Joelon Software blog post. It’s the fourth Joel’s Test: A Bug Database.

Since, I still don’t know yet what tool will help us to store our bugs, I’ll write my first bug in this blog post. And also I’d like to know how to write snippet in Jekyll, which powered this blog.

So, let’s give it a shot!

Example, I am querying database using Django query filter.

try:
	borrowed_books = Book.objects.filter(borrow_date__lte=datetime.date.today(), 
		user=request.user, borrow_status=True)
except Book.DoesNotExist:
	raise Http404("You're not borrowing any books")

This code will not return the exception eventhough there is no match with the filter rule. No match filter query will only return empty list. So, I need to fix the code.

Let’s try to debug using the django shell.

>>> from aurora.apps.users.models import User
>>> u1 = User.objects.get(email='borrower101@aurora.co')
>>> from aurora.apps.books.models import Book
>>> borrowing = Book.objects.filter(borrow_date__lte=datetime.date.today(), 
		user=u, borrow_status=True)
[]
>>> u2 = User.objects.get(email='borrower102@aurora.co')
>>> borrowing = Book.objects.filter(borrow_date__lte=datetime.date.today(), 
		user=u, borrow_status=True)
[<Book: Dahl, Roald>, <Book: Griffith, Andy>]

So user u1 doesn’t borrow any books while u2 borrows 2 books. What to do to improve this code? We could check the query length. If the query length equalas to zero then we could throw the exception.

borrowed_books = Book.objects.filter(borrow_date__lte=datetime.date.today(), 
	user=request.user, borrow_status=True)

if borrowed_books.count() == 0:		
	raise Http404("You're not borrowing any books")

That’s all for now.

Melbourne Django Hack Weekend

Wed, 18 Mar 2015 07:18:20 +0000

Wow, it’s already March 2015 and I haven’t written anything since then here.

On March 9, it was public holiday at Victoria. So it was a long weekend. I received invitation to join melb-django hack weekend. Since I didn’t have any schedule yet, I decided to join and get ready for my first time hack experience.

The hack weekend lasted for two days: on Sunday March 8 and on Monday March 9. Unfortunately I could only joined on Sunday. Actually it will be great if I could join the second day, because on the first day I spent most of my time for setting up the environment.

Since no one had an idea what django project/app to hack, Curtis decided to continue the previous hack project which was django-dequorum. Curtis explained what is django-dequorum and what features which is undone. django-dequorum is a simple forum django application. Users could post threads and other users could make comments. To make things easier what things need to be done, Curtis put them on the github issues. And we agreed that we will use git flow to hack this django-dequorum. Everyone will fork and make pull request to contribute to this project.

Suddenly, it was 12.30 So we decided to have lunch before we hack django-dequorum. We walked to Lenthil, a unique canteen at Abbotsford. They provide vegetarian menu. They didn’t charge on how much we ate. They put poster explained how they run this canteen and how much does it cost. We put the money inside a box.

After lunch, Nicole took the initiative to do the look and feel. Nicole drew the layout.

I didn’t join the layout discussion because I was still struggling with the environment setup. At first I setup my environment with python 2.7.x and later I found that they are using python3. So I re-set up my virtualenv.

And then I was confused. I didn’t want git to track changes on the django project directory but I wanted git to track changes on django-dequorum app. I put a symbolic link, still failed. I finally managed with folder symbolic link.

Other problem raised after we forked the github repo. How to keep our forked repo updated with funkybob repo? Since I had this problem before so I already knew the answer. I helped my friends on how to add another git remote repository.

I still didn’t make any commits to this open source project, but hopefully I could contribute in the future. It was a nice hack weekend with friendly new friends.