installing posix man pages

For example, if you can't get man pages for pthread_create,

(Some blogs recommend you to install glibc-doc, but it wouldn't work.)

just do 'sudo apt-get install manpages-posix-dev'

Using autocomplete plugin of jQuery with django

1. Download jQuery auto complete plugin here.

2. Unzip it.

3. Copy below files from the unzipped onto your javascript directory.

• jquery.autocomplete.css
• jquery.autocomplete.js
• jquery.bgiframes.min.js
• jquery.dimensions.js (from jquery.com)

4. Include them.

5. If you want to activate auto complete onto the html tag with id 'qwerty', add following code onto your js code area.

$(document).ready(function(){
  $("#qwerty").autocomplete{
    '/ajax/autocomplete',
    {multiple: true, multipleSeparator: ', '}
  );
});

6. Setup urls.py so that it can handle '/ajax/autocomplete' with ajax_autocomplete module.

7. in views.py, make ajax_autocomplete module like,

def ajax_autocomplete(request):
  if request.GET.has_key('q'):
    # Write your code here (search dictionary or db, etc..)
    # And put it onto res (separated with '\n').
    return HttpResponse(res)
  return HttpResponse()

8. Done. Have fun :)

MSN proxy with ssh using Pidgin

If your company blocked MSN port and you have accessable server out of your company, use it as a proxy with ssh -D option.

Set tunnel with '>ssh -D 1234 yourserveraddress.com'.
(You can use any port number instead of 1234.)

Set proxy option in your pidgin.
Host : localhost
Port : 1234

That's all. Have fun.

Using django - Accounts

Django auth system is in django.contrib.auth.
(Included in INSTALLED_APPS as a default)

Login page
You can use default django login handler.

<urls.py>
urlpatterns = patterns('',
  ...
  (r'^login/$', 'django.contrib.auth.views.login')
<eof>

You need to make a template for login page.

<templates/registration/login.html>
 <form methos='post' action='.'>
  <label for='id_username'>Username : </label>
  {{ form.username }}
  <br>
  <label for='id_password'>Password : </label>
  {{ form.password }}
  <br>
  <input type='hidden' name='next' value='/'/>
  <input type='submit' value='Login'/>
 </form>
<eof>

User objects methods

• is_authenticated()


• get_full_name()


• email_user(subject, message, from_email=None)


• set_password(raw_password)


• check_password(raw_password)

Logout
<views.py>
from django.http import HttpResponseRedirect
from django.contrib.auth import logout

def logout_page(request):
  logout(request)
  return HttpResponseRedirect('/')
<eof>

<urls.py>
  ...
  (r'^logout/$', logout_page),
  ...
<eof>

Using django - database

Django seldom uses SQL. It uses python class to access DB.

Pros. You can apply one code to various types of DB.

In django database,
- Data type is equal to table.
- Class member is like a table field.

Designing data model

Create data type(table) in ur sampleapp/models.py
<models.py>
from django.db import models

class SampleTable(models.Model):
  fieldA = models.IntegerField(unique=True)
<eof>

Like IntegerField, there are also pre-defined field.
- TextField, DateTimefield, EmailField, URLField, FileField

Creating data type

Check if you activated your application in settings.py.
<settings.py>
INSTALLED_APPS = (
  ...
  'sampleproject.sampleapp',
)
<eof>

Do DB sync
> ./manage.py syncdb

You can see which SQL were generated with,
> ./manage.py sql sampleapp

Note that it generate 'id' field automatically when it makes table.

Using DB Shell

Like we use database console to execute SQLs in terminal,
django also has shell.
> ./manage.py shell
>>> from sampleapp.models import *
>>> record = SampleTable(fieldA=123)
>>> record.fieldA
123
>>> record.save()
>>> records = SampleTable.objects.all()
>>> firstRecord = SampleTable.objects.get(id=1)
>>> record.delete()

Like above, you can create a record, save it into DB, get all records or single one, access by id and delete it.

Note that until you save(), it just remain only in memory.

User data model

'User' data model is already built in.

>>> from django.contrib.auth.models import User
>>> User.objects.all()

User has many attributes like username, email and password.

Using django - beginning

Installing

> sudo apt-get install python-django

Start project

> django-admin startproject sampleproject

Then, directory sampleproject is created.
You can run test server using manage.py in the directory.
You can set details using setting.py.
You can set urls using urls.py

Setting DB(ex. SQLite)

Edit setting.py.
- Set DATABASE_NAME, DATABASE_ENGINE

Then create DB.
> ./manage.py syncdb
- Chose if you will set superuser account.

Run server

> ./manage.py runserver

Check it with url 'http://localhost:8000/'
(8000 is default.)

Create application

In one project, you can have several web-applications. Django calls it as applications.

Create with commands,
> ./manage.py startapp sampleapp

Directory sampleapp is then generated.

Application is recommended to be designed with MVC model.

In sampleapp directory,
You can define http request handler function in the file views.py

Implementing handler

Example,
<views.py>
from django.http import HttpResponse

def main(request):
  output = "<html>Welcome!</html>"
  return HttpResponse(output)
<eof>

'request' has many informations about current requests.

<urls.py>
from sampleapp.views import *
...
urlpatterns = patterns('',
  (r'^$', main)
)
<eof>

In 'r'^$', r means regular expression, ^ is first of uri and $ stands for the last.
So it means '/' actually. Function main has been set as a handler for '/' above.

Now, check your first page with browser using 'http://localhost:8000/'. Good job!

Regular expressions

You can use expressions like below
. ^ $ * + ? | [a-z] \w \d
\w means alphabet or '_'
\d means one letter digit.

Disable firefox disk cache

Enter about:config in search bar.

set browser.cache.disk.enable as "false"

set browser.cache.disk.capacity as "0"

set browser.cache.memory.capacity (ex. 14336 (256M))